https://www.ezylinux.com/en/Linux & open-source notesenhttps://www.ezylinux.com/en/how-to-install-raspberry-pi-os-by-rpi-imager-cli/https://www.ezylinux.com/en/how-to-install-raspberry-pi-os-by-rpi-imager-cli/Mon, 12 Aug 2024 15:35:16 GMTA new case let me add NVMe M.2 storage to my Raspberry Pi. Here is how I installed Raspberry Pi OS using rpi-imager from console mode.https://www.ezylinux.com/en/how-to-change-boot-into-text-console-or-gui-in-raspberry-pi/https://www.ezylinux.com/en/how-to-change-boot-into-text-console-or-gui-in-raspberry-pi/Sat, 27 Jul 2024 12:52:26 GMTThere are two ways to configure Raspberry Pi OS to boot into console or GUI mode. First, run # raspi-config, select "System Options", then "Boot / Auto Login".https://www.ezylinux.com/en/how-to-setup-wifi-5g-by-cli-on-raspberry-pi/https://www.ezylinux.com/en/how-to-setup-wifi-5g-by-cli-on-raspberry-pi/Sat, 27 Jul 2024 12:24:59 GMTRaspberry Pi OS provides raspi-config for configuring Wi-Fi from the command line, including country settings needed for some 5 GHz connections.https://www.ezylinux.com/en/how-to-fix-no-matching-host-key-type-found/https://www.ezylinux.com/en/how-to-fix-no-matching-host-key-type-found/Wed, 12 Jun 2024 07:01:55 GMTAn SSH connection may fail with no matching host key type found when a newer client disables ssh-rsa and ssh-dss. These options configure compatibility.https://www.ezylinux.com/en/how-to-find-and-kill-an-advisory-lock-query/https://www.ezylinux.com/en/how-to-find-and-kill-an-advisory-lock-query/Mon, 19 Feb 2024 15:15:24 GMTWhen an application or PostgreSQL query encounters an advisory lock, identify and terminate the query holding it so the system can continue.https://www.ezylinux.com/en/how-to-fix-ssl_error_rx_record_too_long-on-nginx/https://www.ezylinux.com/en/how-to-fix-ssl_error_rx_record_too_long-on-nginx/Mon, 19 Feb 2024 15:11:26 GMTIf curl reports "SSL_ERROR_RX_RECORD_TOO_LONG" after configuring nginx, the server is returning the wrong HTTP protocol: plaintext HTTP instead of encrypted HTTPS.https://www.ezylinux.com/en/fixing-ssh-no-hostkey-alg-on-debian-ubuntu/https://www.ezylinux.com/en/fixing-ssh-no-hostkey-alg-on-debian-ubuntu/Sat, 14 Oct 2023 06:48:12 GMTIf SSH to a Debian/Ubuntu server returns no hostkey alg, the SSH client failed the host key algorithm check while connecting. To fix it, check permissions…https://www.ezylinux.com/en/how-to-enable-tcp-port-2375-for-external-connection-on-rancher-desktop/https://www.ezylinux.com/en/how-to-enable-tcp-port-2375-for-external-connection-on-rancher-desktop/Sat, 07 Oct 2023 02:53:03 GMTRacher-Desktop users can have the Docker engine accept TCP connections alongside docker.sock with the following command: docker container run -dt --name expose-docker-on-2375 --https://www.ezylinux.com/en/getting-no_such_part-no-such-message-error-while-sending-or-replying-on-a-mail-from-the-webclient/https://www.ezylinux.com/en/getting-no_such_part-no-such-message-error-while-sending-or-replying-on-a-mail-from-the-webclient/Fri, 08 Sep 2023 09:08:44 GMTIf you encounter a problem sending mail through zimbra webmail, the error below may appear: method: [unknown] msg: no such message part: 2.2 code: mail.NO_SUCH_PART detail: soap:Sender trace: qtp509886383-3220https://www.ezylinux.com/en/how-to-disable-visual-mode-on-mouse-select-for-vim/https://www.ezylinux.com/en/how-to-disable-visual-mode-on-mouse-select-for-vim/Thu, 31 Aug 2023 13:50:05 GMTIf selecting text with the mouse in vi enters visual mode, it can cause copy-and-paste problems. To prevent visual mode, create or edit vi ~/.vimrc and add set…https://www.ezylinux.com/en/how-to-add-disclaimer-per-domain-on-zimbra-8-0/https://www.ezylinux.com/en/how-to-add-disclaimer-per-domain-on-zimbra-8-0/Fri, 01 Feb 2019 15:05:33 GMTIf you use ZIMBRA 8.0, which does not yet support per-domain disclaimer configuration (available from 8.5 onward), you can configure it manually as shown below. Enable domain based signature in globhttps://www.ezylinux.com/en/how-to-stress-test-the-memory-on-linux/https://www.ezylinux.com/en/how-to-stress-test-the-memory-on-linux/Fri, 03 Aug 2018 07:26:16 GMTstress tests CPU, memory, I/O, and HDD workloads on POSIX systems. This article shares commands to use 95% of memory to check for memory problems.https://www.ezylinux.com/en/ansible-tutorial-directory-layout-example/https://www.ezylinux.com/en/ansible-tutorial-directory-layout-example/Tue, 26 Jul 2016 15:17:05 GMTAnsible is agentless configuration management using SSH. This tutorial explains directory layout for organizing YAML tasks for easier editing and reuse.https://www.ezylinux.com/en/packstack-gets-failed-load-plugin-file-prescript_000-py-error/https://www.ezylinux.com/en/packstack-gets-failed-load-plugin-file-prescript_000-py-error/Fri, 19 Feb 2016 05:26:46 GMTWhen running packstack to install OpenStack, the following error may appear: [root@openstack-liberty1 ~]# packstack --answer-file=answers.txt ERROR:root:Failed to load plugin from file prescript_000.pyhttps://www.ezylinux.com/en/how-to-fix-memory-leak-from-big-nfs_inode_cache/https://www.ezylinux.com/en/how-to-fix-memory-leak-from-big-nfs_inode_cache/Thu, 03 Dec 2015 09:27:54 GMTA Linux server was reported to be using over 90% of its memory, but its administrator could not identify a memory-heavy process. My initial check with free showed nothing unusual.https://www.ezylinux.com/en/blacklist-and-whitelist-with-amavisd/https://www.ezylinux.com/en/blacklist-and-whitelist-with-amavisd/Sun, 29 Nov 2015 16:56:29 GMTConfigure Blacklist and Whitelist with Amavisd in ZIMBRA instead of Postfix Blacklist/Whitelist. Configuration steps: 1. Edit /opt/zimbra/conf/amavis.conf.in and add the following…https://www.ezylinux.com/en/how-to-block-external-email-from-domains-or-individual-email/https://www.ezylinux.com/en/how-to-block-external-email-from-domains-or-individual-email/Sun, 29 Nov 2015 16:41:44 GMTTo configure ZIMBRA to reject external email addressed to users in the system, or blacklist email, follow these steps. 1. Configure smtpd_sender_restrictions as shown below.https://www.ezylinux.com/en/how-to-change-the-recipient-of-the-daily-report/https://www.ezylinux.com/en/how-to-change-the-recipient-of-the-daily-report/Thu, 05 Nov 2015 05:13:28 GMTBy default, ZIMBRA emails the system daily report to admin@yourdomain.com. To send the daily report to a different email address, use the following procedure.https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B3%E0%B8%AB%E0%B8%99%E0%B8%94-whitelistblacklist-%E0%B8%9A%E0%B8%99-zimbra-8-5-8-6/https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B3%E0%B8%AB%E0%B8%99%E0%B8%94-whitelistblacklist-%E0%B8%9A%E0%B8%99-zimbra-8-5-8-6/Tue, 03 Nov 2015 13:02:41 GMTZIMBRA 8.5 and later changed the configuration for blacklists and whitelists. To add whitelist/blacklist entries, follow these steps. Whitelist: create /opt/zimbra…https://www.ezylinux.com/en/white-list-for-zimbra-to-bypass-rbls/https://www.ezylinux.com/en/white-list-for-zimbra-to-bypass-rbls/Tue, 03 Nov 2015 12:28:05 GMTIf you use RBLs such as spamhaus.org on ZIMBRA to block spam, a customer's mail server may be blacklisted by the RBLs and unable to send to your system after being identified as potential spam.https://www.ezylinux.com/en/%E0%B8%9B%E0%B8%B1%E0%B8%8D%E0%B8%AB%E0%B8%B2-%E0%B9%84%E0%B8%A1%E0%B9%88%E0%B9%80%E0%B8%95%E0%B9%87%E0%B8%A1%E0%B8%88%E0%B8%AD-zimbra-web-client-chrome/https://www.ezylinux.com/en/%E0%B8%9B%E0%B8%B1%E0%B8%8D%E0%B8%AB%E0%B8%B2-%E0%B9%84%E0%B8%A1%E0%B9%88%E0%B9%80%E0%B8%95%E0%B9%87%E0%B8%A1%E0%B8%88%E0%B8%AD-zimbra-web-client-chrome/Mon, 07 Sep 2015 07:33:23 GMTA new Google Chrome version released on 2 September 2015 caused Zimbra Web Client 8.6, 8.5, and 8.0 to display the mail preview incorrectly, cutting it off instead of filling the screen.https://www.ezylinux.com/en/how-to-fix-loopback-devices-is-strongly-discouraged-for-production-use-on-docker/https://www.ezylinux.com/en/how-to-fix-loopback-devices-is-strongly-discouraged-for-production-use-on-docker/Mon, 03 Aug 2015 16:02:05 GMTDocker 1.6+ on CentOS 7 or RHEL 7 may warn that loopback devices are strongly discouraged for production use when using devicemapper storage.https://www.ezylinux.com/en/fix-dead-vlan-4095-neutron/https://www.ezylinux.com/en/fix-dead-vlan-4095-neutron/Fri, 03 Jul 2015 17:19:28 GMTIf VMs cannot ping their gateway or router after creating a network and router in OpenStack, check the VLAN tags in Open vSwitch on the compute and network nodes.https://www.ezylinux.com/en/how-to-fix-cloud-config-not-work-with-error-failed-loading-yaml-blob/https://www.ezylinux.com/en/how-to-fix-cloud-config-not-work-with-error-failed-loading-yaml-blob/Thu, 25 Jun 2015 11:32:25 GMTIf cloud-config on an AWS EC2 instance or OpenStack does not behave as configured, and the error log shows Failed at merging in cloud config part from ... as below…https://www.ezylinux.com/en/how-to-fix-error-queue-report-unavailable-mail-system-is-down/https://www.ezylinux.com/en/how-to-fix-error-queue-report-unavailable-mail-system-is-down/Thu, 25 Jun 2015 04:01:37 GMTIf Zimbra cannot send or receive mail while webmail, POP, and IMAP work normally, check the log for "fatal: Queue report unavailable - mail system is down", as in the example zimbra@zm:~$https://www.ezylinux.com/en/mysql-error-1206-the-total-number-of-locks-exceeds-the-lock-table-size/https://www.ezylinux.com/en/mysql-error-1206-the-total-number-of-locks-exceeds-the-lock-table-size/Wed, 24 Jun 2015 18:08:42 GMTA query on an InnoDB table with a very large number of rows may fail with ERROR 1206 (HY000): The total number of locks exceeds the lock table size.https://www.ezylinux.com/en/mysql-replication-got-fatal-error-1236/https://www.ezylinux.com/en/mysql-replication-got-fatal-error-1236/Wed, 24 Jun 2015 17:32:17 GMTIn MySQL replication, the slave retrieves data from the master's binlog and replays it locally. If the slave stops with error 1236, as shown below, how can we fix it…https://www.ezylinux.com/en/how-to-fix-an-ssh-connection-refused-with-no-hostkey-alg/https://www.ezylinux.com/en/how-to-fix-an-ssh-connection-refused-with-no-hostkey-alg/Wed, 24 Jun 2015 16:27:10 GMTIf connecting to a server over SSH fails with "no hostkey alg", as in the example below: debug1: Reading configuration data /etc/ssh_config debug1: Connecting to 192.168.1.1 [192.168.1.1] port 22.https://www.ezylinux.com/en/how-to-list-members-in-distribution-lists/https://www.ezylinux.com/en/how-to-list-members-in-distribution-lists/Tue, 23 Jun 2015 15:34:58 GMTA script to list users in every distribution list in the system, showing the results by distribution list, as in this example: ======= GROUP: dist1 ============= user1 ezy, user1@ezymailhosting.localhttps://www.ezylinux.com/en/how-to-fix-cannot-load-from-mysql-proc-the-table-is-probably-corrupted/https://www.ezylinux.com/en/how-to-fix-cannot-load-from-mysql-proc-the-table-is-probably-corrupted/Thu, 16 Apr 2015 03:26:44 GMTIf MySQL reports "Error: Cannot load from mysql.proc. The table is probably corrupted", its schema may be a different version from the running server.https://www.ezylinux.com/en/web-site-for-check-hardware-warranty/https://www.ezylinux.com/en/web-site-for-check-hardware-warranty/Wed, 08 Apr 2015 09:49:32 GMTA collection of links for checking hardware warranties. HP: http://h20564.www2.hp.com/hpsc/wc/public/home IBM: http://www-947.ibm.com/support/entry/portal/wluphttps://www.ezylinux.com/en/send-email-netcat/https://www.ezylinux.com/en/send-email-netcat/Thu, 12 Mar 2015 05:01:27 GMTThere are many ways to send mail from the Linux command line. For repeated system tests, netcat can send a prepared message with one command.https://www.ezylinux.com/en/how-to-resolves-zmconfigd-service-cant-start-on-zimbar-8-5/https://www.ezylinux.com/en/how-to-resolves-zmconfigd-service-cant-start-on-zimbar-8-5/Wed, 11 Mar 2015 08:28:16 GMTIf you install zimbra 8.5.0 on Centos 7 or Red Hat Enterprise 7 and zmconfigd fails to start, as in this example: [zimbra@ezymailhosting ~]$ zmcontrol status Host mail.amarz.nehttps://www.ezylinux.com/en/change-helo-ehlo-hostname-zimbra/https://www.ezylinux.com/en/change-helo-ehlo-hostname-zimbra/Fri, 06 Mar 2015 14:51:19 GMTEHLO (or HELO) identifies a host at the start of an SMTP protocol connection. In zimbra, you can change the EHLO (or HELO) sent to other smtp servers and set the greeting banner.https://www.ezylinux.com/en/change-a-network-interface-name-on-centos-rhel-7/https://www.ezylinux.com/en/change-a-network-interface-name-on-centos-rhel-7/Fri, 06 Mar 2015 06:56:42 GMTLinux network interfaces are commonly named eth0, eth1, ... ethx. These names do not describe the interface hardware, so they do not tell us what kind of hardware eth0 or eth1 is…https://www.ezylinux.com/en/%E0%B9%80%E0%B8%9B%E0%B8%A3%E0%B8%B5%E0%B8%A2%E0%B8%9A%E0%B9%80%E0%B8%97%E0%B8%B5%E0%B8%A2%E0%B8%9A-sysvinit-vs-systemd/https://www.ezylinux.com/en/%E0%B9%80%E0%B8%9B%E0%B8%A3%E0%B8%B5%E0%B8%A2%E0%B8%9A%E0%B9%80%E0%B8%97%E0%B8%B5%E0%B8%A2%E0%B8%9A-sysvinit-vs-systemd/Wed, 04 Mar 2015 14:07:51 GMTRHEL 7 changes its service manager from SysVinit to systemd, offering parallel operation, mount point handling, and cgroups support. These tables compare their commands.https://www.ezylinux.com/en/find-openstack-cloud-images/https://www.ezylinux.com/en/find-openstack-cloud-images/Thu, 26 Feb 2015 04:17:47 GMTA collection of OpenStack cloud images for various distributions, for creating images in Glance. CirrOS is a small Linux cloud image for testing instance creation.https://www.ezylinux.com/en/fix-yum-return-segmentation-fault-error/https://www.ezylinux.com/en/fix-yum-return-segmentation-fault-error/Thu, 25 Dec 2014 08:58:16 GMTOn CentOS 5, yum may return a Segmentation fault error, for example: [root@ezylinux ~]# yum update bash. base | 1.1 kB 00:00…https://www.ezylinux.com/en/convert-string-lower-case/https://www.ezylinux.com/en/convert-string-lower-case/Wed, 17 Dec 2014 04:17:13 GMTThere are several ways to convert uppercase strings to lowercase in Bash: tr, awk, Bash 4.0 expansion, or Perl.https://www.ezylinux.com/en/change-idrac-password-using-racadm/https://www.ezylinux.com/en/change-idrac-password-using-racadm/Wed, 22 Oct 2014 11:14:57 GMTReset an iDRAC password directly from the server through OpenManage using racadm. Install OpenManage before following these steps.https://www.ezylinux.com/en/fix-bind-hangs-generating-etc-rndc-key/https://www.ezylinux.com/en/fix-bind-hangs-generating-etc-rndc-key/Wed, 22 Oct 2014 10:53:06 GMTAfter setting up a DNS server, starting the named service may hang at Generating /etc/rndc.key:, as shown: [root@zm named]# /etc/init.d/named restart. Stopping named…https://www.ezylinux.com/en/fix-ssl_connect-certificate-verify-failed-puppet-client/https://www.ezylinux.com/en/fix-ssl_connect-certificate-verify-failed-puppet-client/Sun, 05 Oct 2014 13:24:59 GMTAfter installing the Puppet client, # puppet agent --test connects to the Puppet master but may produce: err: Could not retrieve catalog from remote server: SSL…https://www.ezylinux.com/en/find-delivery-performance-zimbra-mail-server/https://www.ezylinux.com/en/find-delivery-performance-zimbra-mail-server/Sun, 05 Oct 2014 10:14:43 GMTYou can check the performance of incoming and outgoing email on Zimbra mail by examining its delivery logs, allowing you to analyze system performance and identify which parts take particularly long…https://www.ezylinux.com/en/fixes-zimbra-desktop-can-start-windows-updates/https://www.ezylinux.com/en/fixes-zimbra-desktop-can-start-windows-updates/Tue, 27 May 2014 16:45:51 GMTSome Zimbra Desktop users may be unable to start it after updating Windows. Reinstalling Zimbra Desktop does not resolve this problem. How to fix Zimbra Desktop...https://www.ezylinux.com/en/installing-mariadb-10-ubuntu-12-04-lts/https://www.ezylinux.com/en/installing-mariadb-10-ubuntu-12-04-lts/Tue, 06 May 2014 08:33:30 GMTInstalling MariaDB 10 on Ubuntu 12.04 LTS using MariaDB's repository. Import the key and install the repository: sudo apt-get install python-software-properties sudo apt-key adv --recv-keyshttps://www.ezylinux.com/en/scanning-heartbleed-bug-nmap-nse-script/https://www.ezylinux.com/en/scanning-heartbleed-bug-nmap-nse-script/Fri, 11 Apr 2014 08:36:20 GMTHeartbleed Bug: OpenSSL Security Flaw leaves secure-protocol services using OpenSSL 1.0.1 vulnerable. Administrators using OpenSSL need to check their systems.https://www.ezylinux.com/en/critical-security-patch-openssl-heartbleed-vulnerability/https://www.ezylinux.com/en/critical-security-patch-openssl-heartbleed-vulnerability/Fri, 11 Apr 2014 03:57:59 GMTThe OpenSSL Heartbleed bug (CVE-2014-0160) lets an attacker send a malformed heartbeat message and obtain data stored in the target machine's memory.https://www.ezylinux.com/en/heartbleed-bug-openssl-security-flaw/https://www.ezylinux.com/en/heartbleed-bug-openssl-security-flaw/Thu, 10 Apr 2014 12:34:13 GMTSecurity researchers discovered Heartbleed (CVE-2014-0160), a bug in OpenSSL 1.0.1 through 1.0.1f and 1.0.2beta that can expose memory contents.https://www.ezylinux.com/en/rescan-scsi-bus-without-rebooting/https://www.ezylinux.com/en/rescan-scsi-bus-without-rebooting/Mon, 07 Apr 2014 15:54:35 GMTAfter adding a hotplug-capable HDD to Linux, whether on a VM or physical machine, # fdisk -l may not show it until reboot. Rescanning SCSI can detect it without rebooting.https://www.ezylinux.com/en/enables-command-line-history-sqlplus/https://www.ezylinux.com/en/enables-command-line-history-sqlplus/Mon, 17 Mar 2014 04:06:39 GMTSQL*PLUS (sqlplus) does not let you press the up or down arrow to browse previous commands. It only lets you inspect one previous command, making repeated commands inconvenient.https://www.ezylinux.com/en/get-day-current-time-bash/https://www.ezylinux.com/en/get-day-current-time-bash/Thu, 13 Mar 2014 08:00:22 GMTUse date with -d in Bash to display yesterday's date or an earlier date.https://www.ezylinux.com/en/show-running-processes-oracle-db/https://www.ezylinux.com/en/show-running-processes-oracle-db/Thu, 06 Mar 2014 07:20:47 GMTOracle tip: a script displays queries running on an Oracle database, similar to show processlist in MySQL.https://www.ezylinux.com/en/trim-whitespace-bash-variable/https://www.ezylinux.com/en/trim-whitespace-bash-variable/Thu, 20 Feb 2014 02:47:16 GMTA small Bash shell tip: remove trailing spaces, leading spaces, or both from a variable with sed.https://www.ezylinux.com/en/turn-oracle-password-expiration/https://www.ezylinux.com/en/turn-oracle-password-expiration/Thu, 13 Feb 2014 18:26:24 GMTBy default, Oracle user passwords expire after 180 days and must be changed. To remove the expiry, change PASSWORD_LIFE_TIME on the user's profile.https://www.ezylinux.com/en/fix-chroot-return-exec-format-error/https://www.ezylinux.com/en/fix-chroot-return-exec-format-error/Mon, 10 Feb 2014 17:03:44 GMTA chroot Exec format error in Red Hat/CentOS rescue mode usually means the running environment and target commands use different architectures.https://www.ezylinux.com/en/count-blank-lines-non-blank-lines-file/https://www.ezylinux.com/en/count-blank-lines-non-blank-lines-file/Wed, 01 Jan 2014 02:09:04 GMTShell techniques for counting blank and nonblank lines in a file, useful in scripts and troubleshooting.https://www.ezylinux.com/en/export-mysql-database-based-on-a-where-condition/https://www.ezylinux.com/en/export-mysql-database-based-on-a-where-condition/Mon, 30 Dec 2013 15:08:36 GMTMYSQLDUMP exports data from MySQL databases. It is commonly used to export all data from a table or database, but it can also export selected data…https://www.ezylinux.com/en/read-pcap-file-linux-cli-using-tcpdump/https://www.ezylinux.com/en/read-pcap-file-linux-cli-using-tcpdump/Tue, 12 Nov 2013 15:36:09 GMTpcap files from tcpdump or network devices are binary and cannot be read in ordinary text editors. tcpdump can read them directly from the Linux console.https://www.ezylinux.com/en/installing-mysql-5-6-using-mysql-yum-repository/https://www.ezylinux.com/en/installing-mysql-5-6-using-mysql-yum-repository/Sun, 10 Nov 2013 18:16:03 GMTOracle has released a MySQL Yum repository to make installing and updating MySQL server easier. Initially it supports Red Hat/Oracle Enterprise Linux/CentOS 6 and Fedora 18 and 19…https://www.ezylinux.com/en/bug-invalid-grant-command-will-breaks-replication/https://www.ezylinux.com/en/bug-invalid-grant-command-will-breaks-replication/Wed, 06 Nov 2013 14:47:42 GMTMySQL 5.6 has a bug to watch for: running GRANT privileges in PhpMyAdmin may cause a slave to stop replicating (bug report: http://bugs.mysql.com/bug.php?id=68892). After using MySQL 5…https://www.ezylinux.com/en/redirect-stdout-stderr-log-file/https://www.ezylinux.com/en/redirect-stdout-stderr-log-file/Sun, 03 Nov 2013 10:16:41 GMTHow to redirect standard output and standard error to a log file. Correct syntax: command > /path/to/log 2>&1. This redirects stdout to the log and stderr to stdout.https://www.ezylinux.com/en/compress-mysqldump-output-gzipbzip2/https://www.ezylinux.com/en/compress-mysqldump-output-gzipbzip2/Sun, 03 Nov 2013 08:34:40 GMTmysqldump exports MySQL data in SQL format and is commonly used for backups. Normally these backups are not compressed.https://www.ezylinux.com/en/list-stored-procedures-and-show-procedure-code-in-mysql/https://www.ezylinux.com/en/list-stored-procedures-and-show-procedure-code-in-mysql/Thu, 24 Oct 2013 16:09:41 GMTTo list the stored procedures in MySQL and display their procedure code, follow these steps. Listing MySQL stored procedures: list the procedures in the system. mysql> SHO…https://www.ezylinux.com/en/find-top-frequently-using-queries-mysql/https://www.ezylinux.com/en/find-top-frequently-using-queries-mysql/Tue, 22 Oct 2013 06:44:56 GMTMySQL tip: find the ten most frequently used queries over a period using tcpdump or mysqlbinlog to collect and rank them.https://www.ezylinux.com/en/else-statements-bash-script/https://www.ezylinux.com/en/else-statements-bash-script/Mon, 21 Oct 2013 17:32:55 GMTAn overview of if/else statements in Bash scripts and comparison conditions. Basic if syntax: if [ condition ] then ... fi.https://www.ezylinux.com/en/install-apache2-worker-mpm-fcgi-apc-centos/https://www.ezylinux.com/en/install-apache2-worker-mpm-fcgi-apc-centos/Sun, 20 Oct 2013 17:33:24 GMTApache on CentOS uses Prefork by default with the PHP module. Under heavy loads, switching to Apache worker with PHP fcgi (PHP fastcgi) can reduce memory use.https://www.ezylinux.com/en/how-to-install-apache-worker-php-fastcgi-and-php-fpm-on-ubuntu-12-04-lts/https://www.ezylinux.com/en/how-to-install-apache-worker-php-fastcgi-and-php-fpm-on-ubuntu-12-04-lts/Sun, 20 Oct 2013 14:43:30 GMTApache worker suits heavily loaded web servers with limited resources because it uses less memory than Prefork. Enabling PHP support requires additional configuration.https://www.ezylinux.com/en/how-to-copy-a-table-in-mysql/https://www.ezylinux.com/en/how-to-copy-a-table-in-mysql/Wed, 09 Oct 2013 16:29:00 GMTIn MySQL, a table's structure and data can be copied easily. For example, create table_new with the structure and data from table_name as follows.https://www.ezylinux.com/en/list-default-ports-used-zimbra-mail-server/https://www.ezylinux.com/en/list-default-ports-used-zimbra-mail-server/Tue, 08 Oct 2013 10:43:02 GMTThe network ports used by Zimbra mail server fall into two groups. 1. External Access - Ports accessed by Clients or services outside the Zimbra system.https://www.ezylinux.com/en/fix-error-table-upgrade-required-please-repair-table-2045019/https://www.ezylinux.com/en/fix-error-table-upgrade-required-please-repair-table-2045019/Sat, 05 Oct 2013 11:16:36 GMTIf you have upgraded Zimbra Collaboration Server (ZCS) to version 7 and encounter the error below: Table upgrade required. Please do "REPAIR TABLE" (2045019), from mysqlcheck, as in this example: D…https://www.ezylinux.com/en/how-to-disable-ipv6-on-centos/https://www.ezylinux.com/en/how-to-disable-ipv6-on-centos/Mon, 16 Sep 2013 16:01:45 GMTThere are several ways to disable IPv6. The recommended method is to edit /etc/sysctl.conf rather than disable the IPv6 module, which causes problems with SELinux and other components…https://www.ezylinux.com/en/change-default-os-mta-zcs-postfix/https://www.ezylinux.com/en/change-default-os-mta-zcs-postfix/Mon, 09 Sep 2013 13:52:26 GMTSystem email on a Zimbra server normally uses the system MTA. To send system mail using the Zimbra mailer instead of the default OS MTA, follow these steps. Backup default OS MTA [root@Ehttps://www.ezylinux.com/en/how-to-uses-mysqldump-to-get-structure-or-schema-data-only/https://www.ezylinux.com/en/how-to-uses-mysqldump-to-get-structure-or-schema-data-only/Tue, 03 Sep 2013 16:53:24 GMTmysqldump normally exports both database structure and data. Add -d or --no-data to export only the structure or schema.https://www.ezylinux.com/en/get-new-email-notifications-zimbra-mail-system/https://www.ezylinux.com/en/get-new-email-notifications-zimbra-mail-system/Wed, 28 Aug 2013 15:05:14 GMTZimbra webmail supports new email notifications through Yahoo! Browser Plus, as described in How to setting pop-up email notification in Zimbra, but Yahoo! decided to close the project.https://www.ezylinux.com/en/how-to-disable-zimbras-duplicate-email-detection/https://www.ezylinux.com/en/how-to-disable-zimbras-duplicate-email-detection/Tue, 20 Aug 2013 17:13:23 GMTZimbra detects duplicate messages to prevent multiple copies of the same email. This check is enabled by default and can be disabled for the server or individual accounts.https://www.ezylinux.com/en/how-to-removepurge-mysql-binary-logs/https://www.ezylinux.com/en/how-to-removepurge-mysql-binary-logs/Sat, 10 Aug 2013 15:27:14 GMTMySQL binary logs consume disk space. Configure their expiry carefully and use MySQL commands to purge them rather than deleting files from the operating system.https://www.ezylinux.com/en/how-to-install-sendmailanalyzer-on-zimbra-mail/https://www.ezylinux.com/en/how-to-install-sendmailanalyzer-on-zimbra-mail/Thu, 08 Aug 2013 15:58:24 GMTSendmailAnalyzer is a log analysis program that helps administrators examine an overview of incoming and outgoing email in graphs and reports, with hourly, daily, and monthly views.https://www.ezylinux.com/en/setting-microsoft-outlook-use-zimbra-directory-service-ldap/https://www.ezylinux.com/en/setting-microsoft-outlook-use-zimbra-directory-service-ldap/Thu, 08 Aug 2013 01:08:44 GMTZimbra has a Directory Service that supports address books through the ldap protocol, allowing Microsoft Outlook to retrieve address book data from Zimbra.https://www.ezylinux.com/en/how-to-share-full-account-all-folders-to-another-user-in-zimbra-mail/https://www.ezylinux.com/en/how-to-share-full-account-all-folders-to-another-user-in-zimbra-mail/Sun, 28 Jul 2013 17:13:54 GMTZimbra supports sharing a full account, or all folders, from one user to another. The recipient can read and edit the shared account's data as if it were their own.https://www.ezylinux.com/en/how-to-fix-smtp-authen-fail-with-error-curl_easy_perform-error56/https://www.ezylinux.com/en/how-to-fix-smtp-authen-fail-with-error-curl_easy_perform-error56/Sun, 28 Jul 2013 14:55:44 GMTWhen SMTP authentication fails in Zimbra for every user and program, check the error log at /var/log/zimbra.log for an error like this: Jul 28 16:34:05 server saslauthd[33294]:https://www.ezylinux.com/en/how-to-install-centos-6-for-zimbra-mail-server/https://www.ezylinux.com/en/how-to-install-centos-6-for-zimbra-mail-server/Thu, 25 Jul 2013 17:36:53 GMTZimbra supports only a few Linux distributions. One of the supported distributions is the very popular CentOS 6. This article explains how to install CentOS 6.https://www.ezylinux.com/en/enable-zimbra-global-address-list-gal-to-see-all-domains/https://www.ezylinux.com/en/enable-zimbra-global-address-list-gal-to-see-all-domains/Tue, 23 Jul 2013 13:56:56 GMTZimbra Autocomplete lists email addresses within a domain to help users enter addresses correctly and quickly. It can also be configured to list addresses across all domains.https://www.ezylinux.com/en/bypass-spam-checking-for-internal-messages-in-zimbra-8-x/https://www.ezylinux.com/en/bypass-spam-checking-for-internal-messages-in-zimbra-8-x/Sat, 20 Jul 2013 15:17:00 GMTZimbra normally scans both internal email between local accounts and external email for spam. Sometimes internal messages are therefore marked as spam.https://www.ezylinux.com/en/how-to-reset-virus-database-on-zimbra/https://www.ezylinux.com/en/how-to-reset-virus-database-on-zimbra/Sat, 20 Jul 2013 02:53:34 GMTZimbra uses ClamAV to scan email for viruses. Its virus database is normally updated regularly, but if updates fail, the database needs to be reset.https://www.ezylinux.com/en/setting-a-schedule-delayed-shutdown/https://www.ezylinux.com/en/setting-a-schedule-delayed-shutdown/Fri, 19 Jul 2013 16:19:33 GMTLinux can be shut down in several ways, usually immediately. Scheduling a shutdown and notifying other remote users gives them time to prepare.https://www.ezylinux.com/en/telligent-%E0%B8%8B%E0%B8%B7%E0%B9%89%E0%B8%AD-zimbra-%E0%B8%88%E0%B8%B2%E0%B8%81-vmware/https://www.ezylinux.com/en/telligent-%E0%B8%8B%E0%B8%B7%E0%B9%89%E0%B8%AD-zimbra-%E0%B8%88%E0%B8%B2%E0%B8%81-vmware/Thu, 18 Jul 2013 04:24:01 GMTTelligent has acquired Zimbra from VMWare to broaden its capabilities. Telligent provides enterprise social collaboration that includes real-time communication.https://www.ezylinux.com/en/how-to-check-mysql-password-on-zimbra-server/https://www.ezylinux.com/en/how-to-check-mysql-password-on-zimbra-server/Sat, 13 Jul 2013 16:25:58 GMTZimbra uses a MySQL database to store operational data. Normally, when accessing mysql while logged in as zimbra, you do not need to enter a MySQL password. However, if you need to use MySQL…https://www.ezylinux.com/en/tips-to-speeding-up-dumps-and-imports-data-in-mysql/https://www.ezylinux.com/en/tips-to-speeding-up-dumps-and-imports-data-in-mysql/Mon, 08 Jul 2013 16:16:52 GMTImporting large SQL datasets into MySQL can take a long time. These tips speed it up by adjusting indexes, inserts, autocommit, and constraint checks.https://www.ezylinux.com/en/how-to-fix-yum-error-database-disk-image-is-malformed/https://www.ezylinux.com/en/how-to-fix-yum-error-database-disk-image-is-malformed/Wed, 03 Jul 2013 16:10:28 GMTIf yum reports "Error: database disk image is malformed" while installing or updating packages, as shown below: [root@Ezylinux.com ~]# yum install ruby Loaded pluginhttps://www.ezylinux.com/en/check-mysql-database-size-using-sql-query/https://www.ezylinux.com/en/check-mysql-database-size-using-sql-query/Sat, 29 Jun 2013 04:34:00 GMTSQL queries to check space used by MySQL databases and tables. Check size of all database: run the query below to check each database's size. SELECT TABLE_SCHEMA https://www.ezylinux.com/en/how-to-fix-service-unavailable-from-cause-of-too-many-queries-to-uribl-com/https://www.ezylinux.com/en/how-to-fix-service-unavailable-from-cause-of-too-many-queries-to-uribl-com/Mon, 24 Jun 2013 14:54:12 GMTIf Zimbra cannot receive email while sending works normally, check the log for a message like this: zimbramail postfix/smtpd[xxx]: NOQUEUE: reject: RCPT from mailx.ezylinhttps://www.ezylinux.com/en/enable-sftp-logging-transfer/https://www.ezylinux.com/en/enable-sftp-logging-transfer/Thu, 13 Jun 2013 05:24:21 GMTSFTP, installed with OpenSSH, does not normally log activity. To log access and file changes, configure its Subsystem settings.https://www.ezylinux.com/en/find-out-which-processes-are-using-swap-space/https://www.ezylinux.com/en/find-out-which-processes-are-using-swap-space/Tue, 11 Jun 2013 10:59:12 GMTA script to identify processes using SWAP on a server. It displays process details and the amount of swap space each process uses. #!/bin/bash # Get current swap usage for allhttps://www.ezylinux.com/en/how-to-resolve-yum-error-errno-14-pycurl-error-6-couldnt-resolve-host/https://www.ezylinux.com/en/how-to-resolve-yum-error-errno-14-pycurl-error-6-couldnt-resolve-host/Sun, 09 Jun 2013 17:19:37 GMTAfter installing CentOS, yum installs or updates may fail with "[Errno 14] PYCURL ERROR 6 - "Couldn't resolve host"", as in the example below: http://mirrors.psu.ac.th/pubhttps://www.ezylinux.com/en/zimbra-service-fails-to-start-with-error-97-address-family-not-supported-by-protocol-2007887/https://www.ezylinux.com/en/zimbra-service-fails-to-start-with-error-97-address-family-not-supported-by-protocol-2007887/Fri, 07 Jun 2013 03:54:28 GMTWhen starting the zimbra service, you may encounter the error message below: Starting nginx...nginx: [emerg] socket() [::]:7143 failed (97: Address family not supported by protocol) failed. Starting mta...Failehttps://www.ezylinux.com/en/how-to-fix-wget-unable-to-resolve-host-address-issue/https://www.ezylinux.com/en/how-to-fix-wget-unable-to-resolve-host-address-issue/Fri, 31 May 2013 16:21:56 GMTIf wget reports unable to resolve host address, first test network connectivity, then check whether wget is trying IPv6 on a machine without IPv6 access.https://www.ezylinux.com/en/how-to-check-mailbox-usage-of-all-accounts-in-zimbra-mail-server/https://www.ezylinux.com/en/how-to-check-mailbox-usage-of-all-accounts-in-zimbra-mail-server/Sun, 26 May 2013 16:49:13 GMTA script for checking disk usage on a Zimbra mail server. This check mailbox usage script reports the space used by each user, the assigned Quota, and each user's status.https://www.ezylinux.com/en/how-to-change-helo-message-in-zimbra-mail-server/https://www.ezylinux.com/en/how-to-change-helo-message-in-zimbra-mail-server/Sun, 26 May 2013 15:22:21 GMTTo change SMTP HELO on a Zimbra server to match the configured MX record, follow the procedure below. Log in as the zimbra user. [root@EzyMailHosting ~]# su - zimbra Change the SMTP HELO setting...https://www.ezylinux.com/en/monitor-multiple-logs-in-a-single-shell-with-multitail/https://www.ezylinux.com/en/monitor-multiple-logs-in-a-single-shell-with-multitail/Sat, 25 May 2013 15:24:25 GMTtail is widely used for viewing logs in real time (tail -f /var/log/logfile). MultiTail provides similar functionality with multiple windows in one console.https://www.ezylinux.com/en/bash-autocomplete-feature-on-centos-linux/https://www.ezylinux.com/en/bash-autocomplete-feature-on-centos-linux/Fri, 24 May 2013 09:25:03 GMTBash autocompletion makes Linux work much more convenient. For me it is essential because it makes commands quicker to use.https://www.ezylinux.com/en/how-to-check-apache-compression-gzip-deflate-is-working/https://www.ezylinux.com/en/how-to-check-apache-compression-gzip-deflate-is-working/Fri, 24 May 2013 08:42:59 GMTUse curl from the command line to check whether Apache compresses data before sending it to clients by inspecting its response headers.https://www.ezylinux.com/en/how-to-delete-emails-from-the-zimbra-mta-queue/https://www.ezylinux.com/en/how-to-delete-emails-from-the-zimbra-mta-queue/Fri, 24 May 2013 05:09:41 GMTTo remove large amounts of email stuck in the system queue after a spammer attack, follow these steps. To delete every email in the system queue, run: [root@EzyMailHosting ~]# /opt/zimbhttps://www.ezylinux.com/en/sync-email-calendar-contact-%E0%B8%A3%E0%B8%B0%E0%B8%AB%E0%B8%A7%E0%B9%88%E0%B8%B2%E0%B8%87-iphone-ipad-%E0%B9%81%E0%B8%A5%E0%B8%B0-zimbra/https://www.ezylinux.com/en/sync-email-calendar-contact-%E0%B8%A3%E0%B8%B0%E0%B8%AB%E0%B8%A7%E0%B9%88%E0%B8%B2%E0%B8%87-iphone-ipad-%E0%B9%81%E0%B8%A5%E0%B8%B0-zimbra/Wed, 22 May 2013 16:24:08 GMTAn iPhone, iPad, or iPod touch can be configured to work fully with Zimbra Mail, synchronizing email, Contact (contacts), and Calendar (appointments) from the system.https://www.ezylinux.com/en/how-to-disable-innodb-storage-engine-on-mysql/https://www.ezylinux.com/en/how-to-disable-innodb-storage-engine-on-mysql/Sat, 18 May 2013 12:41:59 GMTMySQL enables the InnoDB storage engine by default. If you do not need it, disable it to save system resources. To disable InnoDB…https://www.ezylinux.com/en/listing-email-name-quota-and-status-of-all-accounts-on-zimbra/https://www.ezylinux.com/en/listing-email-name-quota-and-status-of-all-accounts-on-zimbra/Fri, 17 May 2013 16:06:11 GMTThe script below lists names, email addresses, Mail Quota, and Account status grouped by domain, providing a quick overview from the command line. Example script output…https://www.ezylinux.com/en/how-to-get-a-list-of-all-distribution-list-members/https://www.ezylinux.com/en/how-to-get-a-list-of-all-distribution-list-members/Fri, 17 May 2013 15:30:19 GMTCheck the account names and email addresses in each distribution list (email) by copying the script below and running it as the zimbra user. #!/bin/sh echo > /tmp/groupslist.txhttps://www.ezylinux.com/en/how-to-get-uuid-of-the-hard-disk-in-linux-syetem/https://www.ezylinux.com/en/how-to-get-uuid-of-the-hard-disk-in-linux-syetem/Thu, 16 May 2013 15:05:44 GMTNewer Linux versions use UUIDs to identify hard disks instead of device names. This prevents the system from using the wrong disk when there is more than one and a disk fails or is removed…https://www.ezylinux.com/en/how-to-monitor-zimbra-services/https://www.ezylinux.com/en/how-to-monitor-zimbra-services/Mon, 13 May 2013 18:03:47 GMTMonitoring and checking Zimbra mail services is important for system administrators, who need to learn promptly when the system fails.https://www.ezylinux.com/en/manually-purging-the-zimbra-mailbox-dumpster/https://www.ezylinux.com/en/manually-purging-the-zimbra-mailbox-dumpster/Sun, 12 May 2013 15:09:33 GMTTo remove Dumpster data for a particular user from the system, run the following commands. Zimbra Collaboration Server 7.x.x zmmailbox -z -m user@domain.com mbox user@domain.com> emptyDumpster or zmsoap -zhttps://www.ezylinux.com/en/how-to-enable-dumpster-or-email-retention-policy/https://www.ezylinux.com/en/how-to-enable-dumpster-or-email-retention-policy/Sun, 12 May 2013 15:01:10 GMTSince zimbra 7.0, a new feature called "Dumpster" has allowed users to recover email, calendars and contacts after they have been deleted from trash, helping them recover data quickly.https://www.ezylinux.com/en/how-to-detect-and-prevent-brute-force-attacks-on-zimbra/https://www.ezylinux.com/en/how-to-detect-and-prevent-brute-force-attacks-on-zimbra/Sun, 12 May 2013 12:09:47 GMTPassword policies in ZIMBRA can help prevent malicious users from guessing passwords through brute-force attacks, but this approach does not appear to resolve the problem completely.https://www.ezylinux.com/en/how-to-set-web-server-mode-on-zimbra-mail/https://www.ezylinux.com/en/how-to-set-web-server-mode-on-zimbra-mail/Thu, 02 May 2013 08:03:51 GMTTo make webmail work over http, https, or both, change its operating mode using the steps below. Run the following command to change…https://www.ezylinux.com/en/how-to-monitor-messages-statistics-of-zimbra-mail-server/https://www.ezylinux.com/en/how-to-monitor-messages-statistics-of-zimbra-mail-server/Tue, 30 Apr 2013 17:53:58 GMTZimbra provides monitoring that helps check system status and performance effectively, but it lacks monitoring of email sending and receiving statistics that would help administrators.https://www.ezylinux.com/en/definition-of-dns-status-nxdomain-noerror-and-servfail/https://www.ezylinux.com/en/definition-of-dns-status-nxdomain-noerror-and-servfail/Sat, 27 Apr 2013 14:16:31 GMTNXDOMAIN, NOERROR, and SERVFAIL are DNS query statuses. Understanding them helps interpret what happened when looking up domain records.https://www.ezylinux.com/en/how-to-improve-dns-lookups-on-linux-system/https://www.ezylinux.com/en/how-to-improve-dns-lookups-on-linux-system/Sun, 21 Apr 2013 10:18:12 GMTListing multiple DNS servers in /etc/resolve.conf defines primary and secondary DNS servers. If the primary fails, the system switches to the secondary after a timeout.https://www.ezylinux.com/en/assigning-retention-policies-to-email-folders/https://www.ezylinux.com/en/assigning-retention-policies-to-email-folders/Tue, 16 Apr 2013 17:01:36 GMTZimbra users can configure the removal of email that has stayed in their mailbox too long, similar to removing mail from Trash (normally after more than 30 days). This feature is convenient for users who receive mail and want…https://www.ezylinux.com/en/steps-to-install-ruby-version-manager-rvm-on-centos-6/https://www.ezylinux.com/en/steps-to-install-ruby-version-manager-rvm-on-centos-6/Tue, 16 Apr 2013 15:50:13 GMTCentOS 6 ships with Ruby 1.8.7. Ruby Version Manager (RVM) lets applications use other Ruby versions without changing the main system.https://www.ezylinux.com/en/how-to-fix-unary-operator-expected-error-in-bash-script/https://www.ezylinux.com/en/how-to-fix-unary-operator-expected-error-in-bash-script/Fri, 12 Apr 2013 04:49:49 GMTIf testing a shell script produces [: =: unary operator expected error, check the if condition on the reported line to see whether the variable has a value and whether the code…https://www.ezylinux.com/en/how-to-create-a-partition-size-larger-than-2-tb-on-linux/https://www.ezylinux.com/en/how-to-create-a-partition-size-larger-than-2-tb-on-linux/Tue, 09 Apr 2013 15:54:27 GMTDisks larger than 2 TB require a GPT-capable partitioning tool. gdisk works much like fdisk and supports large disks and up to 128 partitions.https://www.ezylinux.com/en/backup-incoming-mail-from-zimbra-system-to-another-mail-system/https://www.ezylinux.com/en/backup-incoming-mail-from-zimbra-system-to-another-mail-system/Tue, 02 Apr 2013 16:25:10 GMTEdit /opt/zimbra/postfix/conf/mail.cf and add the following two lines. sender_bcc_maps = pcre:/opt/zimbra/postfix/conf/archive_mail recipient_bcc_maps = pcre:/opt/zimbra/postfix/conf/archive_mail https://www.ezylinux.com/en/how-to-transfer-the-spam-db-to-another-server/https://www.ezylinux.com/en/how-to-transfer-the-spam-db-to-another-server/Tue, 05 Mar 2013 13:12:15 GMTWhen migrating zimbra to a new system or installing a new zimbra server, you can retain spam detection as effective as the previous system.https://www.ezylinux.com/en/how-to-install-whois-using-yum-on-centos/https://www.ezylinux.com/en/how-to-install-whois-using-yum-on-centos/Fri, 08 Feb 2013 17:12:06 GMTwhois queries domain information directly, helping administrators check domain ownership, expiry dates, or use the information in scripts.https://www.ezylinux.com/en/improving-anti-spam-on-zimbra-with-whitelistblacklist/https://www.ezylinux.com/en/improving-anti-spam-on-zimbra-with-whitelistblacklist/Tue, 15 Jan 2013 10:33:35 GMTEmail sent by users often ends up in the SPAM folder of recipients on the same Domain or system because the anti-spam system considers the message to resemble SPAM.https://www.ezylinux.com/en/zimbra-users-migration-from-32-bit-to-64-bit-server/https://www.ezylinux.com/en/zimbra-users-migration-from-32-bit-to-64-bit-server/Fri, 11 Jan 2013 07:37:40 GMTMigrating user data from 32-bit Zimbra to 64-bit Zimbra follows a process similar to normal backup and restore of user data in zimbra. Steps for moving user data from a 32-bit machine to a 64-bit machine.https://www.ezylinux.com/en/how-to-fix-error-0x80300001-when-install-windows-server-in-kvm/https://www.ezylinux.com/en/how-to-fix-error-0x80300001-when-install-windows-server-in-kvm/Sun, 06 Jan 2013 17:12:44 GMTWindows Server 2008 R2 installation on KVM can report Error: 0x80300001 when the installer cannot find or read its DVD-ROM after loading virtio drivers.https://www.ezylinux.com/en/install-utorrent-on-centos-6/https://www.ezylinux.com/en/install-utorrent-on-centos-6/Sat, 05 Jan 2013 09:20:26 GMTuTorrent is a widely used BitTorrent client. Years ago it did not support Linux, so running it required Wine. Now uTorrent officially supports Linux…https://www.ezylinux.com/en/how-to-backup-and-restore-zimbras-users/https://www.ezylinux.com/en/how-to-backup-and-restore-zimbras-users/Thu, 27 Dec 2012 08:30:45 GMTThe Zimbra mail server user backup and restore procedure in this article works with both the open source edition and network edition, but cannot be used for version upgrades. Zimbra uses LDAP to store user information…https://www.ezylinux.com/en/how-to-expand-membership-of-distribution-list-in-zimbra/https://www.ezylinux.com/en/how-to-expand-membership-of-distribution-list-in-zimbra/Fri, 14 Dec 2012 08:21:50 GMTZimbra provides distribution lists, or group email, for sending mail to groups, making it convenient to send to all or some recipients using a single email address. Its distribution lists have a limit.https://www.ezylinux.com/en/how-to-extract-a-single-file-directory-from-tar-archive/https://www.ezylinux.com/en/how-to-extract-a-single-file-directory-from-tar-archive/Wed, 12 Dec 2012 05:12:16 GMTOn UNIX or Linux, you can extract selected files or directories from a tarball without first extracting everything. This is more convenient and saves space…https://www.ezylinux.com/en/how-to-fix-high-cpu-usage-problem-on-bind-named/https://www.ezylinux.com/en/how-to-fix-high-cpu-usage-problem-on-bind-named/Mon, 26 Nov 2012 06:42:47 GMTBIND on CentOS 6 may use over 100% CPU when enabled with only zones and zone files configured. Check the logs, SELinux, and bind-chroot.https://www.ezylinux.com/en/how-to-config-default-return-path-in-php-mail/https://www.ezylinux.com/en/how-to-config-default-return-path-in-php-mail/Tue, 20 Nov 2012 07:51:26 GMTSome mail servers reject messages sent by PHP scripts with this error: (host ezylinux.com[74.xx.xxx.xxx] said: 550-Verification failed for 550-The mail server couldhttps://www.ezylinux.com/en/how-to-check-zimbra-version/https://www.ezylinux.com/en/how-to-check-zimbra-version/Wed, 14 Nov 2012 08:05:02 GMTThere are several ways to check the Zimbra version: through a web browser, commands, or the installation history file. I have collected these methods for checking the Zimbra version…https://www.ezylinux.com/en/a-comparison-of-pros-and-cons-between-innodb-and-myisam/https://www.ezylinux.com/en/a-comparison-of-pros-and-cons-between-innodb-and-myisam/Sat, 10 Nov 2012 11:21:41 GMTMySQL has many table storage engines, with InnoDB and MyISAM among the most popular. This article compares their features, performance, advantages, and disadvantages.https://www.ezylinux.com/en/setting-out-of-office-on-samsung-galaxy/https://www.ezylinux.com/en/setting-out-of-office-on-samsung-galaxy/Thu, 25 Oct 2012 15:10:37 GMTOut Of Office lets contacts know you cannot reply to email while on vacation, traveling abroad, or away on business by replying to senders with a predefined message.https://www.ezylinux.com/en/numa-architecture-and-mysql/https://www.ezylinux.com/en/numa-architecture-and-mysql/Wed, 24 Oct 2012 17:14:26 GMTNUMA is a new architecture for multiprocessor systems. Each physical processor has its own memory, allowing faster memory access than the older architecture. Linux…https://www.ezylinux.com/en/how-to-set-out-of-office-auto-reply-message-in-zimbra-webmail/https://www.ezylinux.com/en/how-to-set-out-of-office-auto-reply-message-in-zimbra-webmail/Sun, 21 Oct 2012 18:03:10 GMTZimbra Webmail has an "Out of Office" feature to keep email communication going by telling contacts that you cannot reply immediately, for example while on vacation or attending a seminar.https://www.ezylinux.com/en/how-to-get-physical-number-of-cpu-sockets-on-linux-server/https://www.ezylinux.com/en/how-to-get-physical-number-of-cpu-sockets-on-linux-server/Fri, 21 Sep 2012 11:22:11 GMTOn a Linux server, you can check how many physical CPU sockets it has without opening the machine. The command is dmidecode. Installing dmidecode…https://www.ezylinux.com/en/howto-setting-alway-replyforward-in-the-original-message-format/https://www.ezylinux.com/en/howto-setting-alway-replyforward-in-the-original-message-format/Thu, 20 Sep 2012 10:30:03 GMTZimbra webmail users can choose the message format for replies and forwarded messages, using the default format or the original message's format. Configure replies and forwards to use the original format.https://www.ezylinux.com/en/how-to-streaming-export-and-import-mysql-database-to-other-server/https://www.ezylinux.com/en/how-to-streaming-export-and-import-mysql-database-to-other-server/Wed, 19 Sep 2012 17:47:16 GMTYou can dump a database and simultaneously import it on another machine by using nc (netcat) to stream data to the destination.https://www.ezylinux.com/en/remote-gnome-gui-in-windows-with-xming/https://www.ezylinux.com/en/remote-gnome-gui-in-windows-with-xming/Mon, 17 Sep 2012 15:52:10 GMTMany people assume that connecting to Linux over SSH with PuTTY cannot run GUI applications such as firefox or system-config-network. With the right settings…https://www.ezylinux.com/en/how-to-synchronize-your-zimbra-calendar-to-android-phone/https://www.ezylinux.com/en/how-to-synchronize-your-zimbra-calendar-to-android-phone/Sun, 09 Sep 2012 17:14:57 GMTZimbra has a calendar system that supports iCalendar, also known as iCal, a file format that lets users send meeting requests by email or share them as .ics files. iCalendar has…https://www.ezylinux.com/en/how-to-create-self-signed-certificate-for-zimbra-mail-server/https://www.ezylinux.com/en/how-to-create-self-signed-certificate-for-zimbra-mail-server/Sun, 09 Sep 2012 09:54:46 GMTZimbra Collaboration Suite (ZCS), or Zimbra mail server, uses certificates to secure its operation and communication. If a certificate expires, Zimbra cannot operate, so a new certificate is needed.https://www.ezylinux.com/en/zimbra-zcs-end-user-benefits-%E0%B8%82%E0%B9%89%E0%B8%AD%E0%B8%94%E0%B8%B5-%E0%B8%9B%E0%B8%A3%E0%B8%B0%E0%B9%82%E0%B8%A2%E0%B8%8A%E0%B8%99%E0%B9%8C/https://www.ezylinux.com/en/zimbra-zcs-end-user-benefits-%E0%B8%82%E0%B9%89%E0%B8%AD%E0%B8%94%E0%B8%B5-%E0%B8%9B%E0%B8%A3%E0%B8%B0%E0%B9%82%E0%B8%A2%E0%B8%8A%E0%B8%99%E0%B9%8C/Sun, 09 Sep 2012 09:42:39 GMTBenefits of using Zimbra mail server include the freedom to choose applications and access methods, allowing access anywhere and anytime across operating systems and programs.https://www.ezylinux.com/en/how-to-calculate-storage-size-for-zimbra-mail-server/https://www.ezylinux.com/en/how-to-calculate-storage-size-for-zimbra-mail-server/Sun, 09 Sep 2012 02:09:22 GMTPlanning storage capacity is important: without estimating the total space required, the system may run out of storage. This article shows how to calculate the requirement.https://www.ezylinux.com/en/how-to-setting-pop-up-email-notification-in-zimbra/https://www.ezylinux.com/en/how-to-setting-pop-up-email-notification-in-zimbra/Wed, 05 Sep 2012 18:22:02 GMTYahoo! has discontinued development of Yahoo! Browser Plus, so it can no longer be downloaded. ZebraTray is an alternative program for pop-up notifications of new email. Users of Zimbra webmail...https://www.ezylinux.com/en/displaying-network-traffic-using-tshark/https://www.ezylinux.com/en/displaying-network-traffic-using-tshark/Tue, 28 Aug 2012 15:38:36 GMTTShark is a network protocol analyzer, the text-mode version of Wireshark, that captures live network packets and helps analyze traffic.https://www.ezylinux.com/en/how-to-share-your-email-folders-in-zimbra-mail-server/https://www.ezylinux.com/en/how-to-share-your-email-folders-in-zimbra-mail-server/Mon, 27 Aug 2012 15:48:02 GMTZimbra mail lets email owners share email folders with other users. Shared users can have read-only access or permission to manage email in the folder, as specified by the folder owner.https://www.ezylinux.com/en/change-name-appears-in-from-field-on-outgoing-email-of-zimbra-webmail/https://www.ezylinux.com/en/change-name-appears-in-from-field-on-outgoing-email-of-zimbra-webmail/Sat, 18 Aug 2012 08:17:28 GMTZimbra webmail lets users change the sender name themselves without an administrator making the change. Follow these steps to change the sender name.https://www.ezylinux.com/en/how-to-allow-viewing-messages-with-external-images-on-zimbra/https://www.ezylinux.com/en/how-to-allow-viewing-messages-with-external-images-on-zimbra/Sat, 11 Aug 2012 17:16:39 GMTZimbra webmail blocks automatic loading of external images for user safety. Add sender email addresses or domains to Trusted Address to load images without clicking display image(s).https://www.ezylinux.com/en/how-to-check-status-start-and-stop-on-zimbra-service/https://www.ezylinux.com/en/how-to-check-status-start-and-stop-on-zimbra-service/Sat, 11 Aug 2012 16:31:05 GMTUse zmcontrol to check the operating status of Zimbra. It can also start and stop Zimbra. To use it, you must first log in as the zimbra user…https://www.ezylinux.com/en/how-to-unlock-zimbra-accounts/https://www.ezylinux.com/en/how-to-unlock-zimbra-accounts/Sat, 11 Aug 2012 16:12:46 GMTZimbra immediately locks an account after a configured number of failed login attempts to stop hackers repeatedly guessing passwords until they find the right one. If incorrect passwords reach the configured limit…https://www.ezylinux.com/en/protecting-apache-against-dosddos-attack-with-mod_evasive/https://www.ezylinux.com/en/protecting-apache-against-dosddos-attack-with-mod_evasive/Mon, 06 Aug 2012 17:24:02 GMTSending a large number of HTTP requests to a web server is a type of DoS (Denial of Service) attack that increasingly overloads the server until it can no longer serve requests…https://www.ezylinux.com/en/fix-a-prefix-of-it-is-already-part-of-a-volume-on-glusterfs/https://www.ezylinux.com/en/fix-a-prefix-of-it-is-already-part-of-a-volume-on-glusterfs/Fri, 03 Aug 2012 15:09:14 GMTWhen reusing a removed GlusterFS brick, adding it may fail with /path/app or a prefix of it is already part of a volume. Here is how to resolve it.https://www.ezylinux.com/en/fix-error-when-adding-datastore-in-vmware-esxi-4-5/https://www.ezylinux.com/en/fix-error-when-adding-datastore-in-vmware-esxi-4-5/Thu, 26 Jul 2012 15:42:23 GMTAdding a datastore to VMware ESX/ESXi with Add Storage wizard may fail with: An error occurred during host configuration. Call “HostDatastoreSystem.QueryVmfsDatastoreCreateOpthttps://www.ezylinux.com/en/%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-zabbix-monitoring/https://www.ezylinux.com/en/%E0%B8%9A%E0%B8%A3%E0%B8%B4%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-zabbix-monitoring/Tue, 24 Jul 2012 17:16:26 GMTZABBIX is an enterprise monitoring system that goes beyond server and network monitoring. It efficiently monitors servers running any operating system and network devices by combining monitoring and alerts…https://www.ezylinux.com/en/guide-for-fix-incoming-mail-problems/https://www.ezylinux.com/en/guide-for-fix-incoming-mail-problems/Mon, 23 Jul 2012 15:32:58 GMTWhen you have problems receiving email from outside, it can be difficult to determine where a message sent to your mail server has gone. First check the mail server logs, which can tell you…https://www.ezylinux.com/en/how-to-configure-ssh-keys-authentication-with-putty/https://www.ezylinux.com/en/how-to-configure-ssh-keys-authentication-with-putty/Sun, 22 Jul 2012 17:00:17 GMTPuTTY is a popular program for remotely accessing Linux. SSH key authentication makes logging in more convenient for system administrators.https://www.ezylinux.com/en/%E0%B8%AA%E0%B8%A3%E0%B9%89%E0%B8%B2%E0%B8%87-group-contact-%E0%B8%81%E0%B8%A5%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%9C%E0%B8%B9%E0%B9%89%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B9%88%E0%B8%AD/https://www.ezylinux.com/en/%E0%B8%AA%E0%B8%A3%E0%B9%89%E0%B8%B2%E0%B8%87-group-contact-%E0%B8%81%E0%B8%A5%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%9C%E0%B8%B9%E0%B9%89%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B9%88%E0%B8%AD/Sun, 15 Jul 2012 06:30:27 GMTGroup Contact Lists on a Zimbra mail server are useful for creating contact groups or regularly sending to a particular group, without entering the email address of every recipient.https://www.ezylinux.com/en/how-to-update-dell-server-firmware-with-dell-unified-server-configurator/https://www.ezylinux.com/en/how-to-update-dell-server-firmware-with-dell-unified-server-configurator/Sun, 15 Jul 2012 05:31:16 GMTDell Unified Server Configurator can automatically update Dell server BIOS, network cards, iDRAC, RAID controllers, and other firmware when the server has internet access.https://www.ezylinux.com/en/create-tasks-in-zimbra-mail-server/https://www.ezylinux.com/en/create-tasks-in-zimbra-mail-server/Thu, 12 Jul 2012 17:57:03 GMTTask management, also called a to-do-list, is a feature of Zimbra mail server (ZCS) that lets users manage their work and share it with coworkers…https://www.ezylinux.com/en/fix-zimbraremotemanagementprivatekeypath-optzimbra-sshzimbra_identity-does-not-exist-on-zimbra-admin-console/https://www.ezylinux.com/en/fix-zimbraremotemanagementprivatekeypath-optzimbra-sshzimbra_identity-does-not-exist-on-zimbra-admin-console/Mon, 09 Jul 2012 16:03:33 GMTWhen using the Zimbra Admin console, clicking a menu to open its page may display an error window with this message: " server zimbra.mail.ezymailhosting.com zimbraRemoteManagementPrivateKeyhttps://www.ezylinux.com/en/how-to-create-an-admin-account-on-zimbra-mail-server/https://www.ezylinux.com/en/how-to-create-an-admin-account-on-zimbra-mail-server/Sun, 08 Jul 2012 17:41:30 GMTCreating an admin account and granting admin privileges to existing users on a Zimbra mail server. The command for creating an admin account is zmprov ca email password zimbraIsAdminAccount TRUE. An example follows.https://www.ezylinux.com/en/fix-permission-denied-issue-when-running-zmsshkeygen-command/https://www.ezylinux.com/en/fix-permission-denied-issue-when-running-zmsshkeygen-command/Sun, 08 Jul 2012 15:50:05 GMTIf zmsshkeygen cannot generate a key because of a Permission denied error, as in this example: [zimbra@Ezymailhosting bin]$ ./zmsshkeygen Generating public/private dsa key pair. ohttps://www.ezylinux.com/en/zimbra-jvm-issue-with-openvz/https://www.ezylinux.com/en/zimbra-jvm-issue-with-openvz/Sun, 08 Jul 2012 15:11:54 GMTIf you run Zimbra on OpenVZ, the zimbra service may fail to start with errors like these: Notification skipped. Starting servers...Could not create the Java virtual machine. Unable to deterhttps://www.ezylinux.com/en/how-to-change-the-theme-of-all-zimbra-clients/https://www.ezylinux.com/en/how-to-change-the-theme-of-all-zimbra-clients/Sun, 08 Jul 2012 09:19:45 GMTFor Zimbra web client or Zimbra Desktop, an administrator can change the web interface theme so that all users must use the administrator's specified theme. Steps for changing the theme.https://www.ezylinux.com/en/how-to-resolve-unable-to-determine-enabled-services-from-ldap/https://www.ezylinux.com/en/how-to-resolve-unable-to-determine-enabled-services-from-ldap/Sat, 07 Jul 2012 10:36:13 GMTAfter restarting the zimbra service or rebooting the server, you may encounter the following error when starting ldap: Starting ldap...Done. Unable to determine enabled services from ldap. Enabled services read fhttps://www.ezylinux.com/en/monitor-apache-virtualhosts-real-time-activity-with-apache-top/https://www.ezylinux.com/en/monitor-apache-virtualhosts-real-time-activity-with-apache-top/Wed, 04 Jul 2012 15:36:46 GMTBasic tools such as top for viewing load and Apache processes may be insufficient for managing a web server with virtual hosts. If Apache uses many resources, they do not show which virtual host…https://www.ezylinux.com/en/%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%A5%E0%B8%B0%E0%B9%80%E0%B8%AD%E0%B8%B5%E0%B8%A2%E0%B8%94-zimbra-packages-%E0%B8%97%E0%B8%B5%E0%B9%88%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87/https://www.ezylinux.com/en/%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%A5%E0%B8%B0%E0%B9%80%E0%B8%AD%E0%B8%B5%E0%B8%A2%E0%B8%94-zimbra-packages-%E0%B8%97%E0%B8%B5%E0%B9%88%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87/Tue, 03 Jul 2012 15:53:49 GMTDetails of the Zimbra packages. Zimbra Core is the main package installed every time and contains libraries, utilities, monitoring tools, and basic configuration files. Zimbra LDAP provides user authentication.https://www.ezylinux.com/en/share-calendar-%E0%B8%9B%E0%B8%8F%E0%B8%B4%E0%B8%97%E0%B8%B4%E0%B8%99%E0%B8%A3%E0%B9%88%E0%B8%A7%E0%B8%A1-zimbra-mail-hosting/https://www.ezylinux.com/en/share-calendar-%E0%B8%9B%E0%B8%8F%E0%B8%B4%E0%B8%97%E0%B8%B4%E0%B8%99%E0%B8%A3%E0%B9%88%E0%B8%A7%E0%B8%A1-zimbra-mail-hosting/Mon, 02 Jul 2012 18:26:50 GMTZimbra mail server allows users to share calendars with others to make teamwork easier and let employees check the availability of their managers or executives.https://www.ezylinux.com/en/how-to-convert-all-myisam-tables-to-innodb-in-a-mysql-database/https://www.ezylinux.com/en/how-to-convert-all-myisam-tables-to-innodb-in-a-mysql-database/Mon, 02 Jul 2012 07:53:50 GMTTo change multiple tables from the MyISAM storage engine to InnoDB, run SELECT CONCAT... to generate the conversion commands, then run the resulting commands…https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-zimbra-desktop-%E0%B9%81%E0%B8%A5%E0%B8%B0%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87%E0%B8%84%E0%B9%88%E0%B8%B2/https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-zimbra-desktop-%E0%B9%81%E0%B8%A5%E0%B8%B0%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87%E0%B8%84%E0%B9%88%E0%B8%B2/Wed, 27 Jun 2012 15:50:43 GMTTo install Zimbra desktop as a mail client in place of Microsoft Outlook, follow these steps: download zimbra desktop from http://www.zimbra.com/downloads/zd-downloads.html. After the download…https://www.ezylinux.com/en/add-spdy-support-to-apache-web-server-with-mod_spdy/https://www.ezylinux.com/en/add-spdy-support-to-apache-web-server-with-mod_spdy/Sat, 23 Jun 2012 09:48:13 GMTSPDY (speedy) is a web networking protocol developed by Google to reduce page load times and improve security. It is being promoted as a standard and is now an Internet Draft.https://www.ezylinux.com/en/fix-missing-dependency-libmysqlclient-so-15-when-installing-mysql-python-via-yum/https://www.ezylinux.com/en/fix-missing-dependency-libmysqlclient-so-15-when-installing-mysql-python-via-yum/Mon, 18 Jun 2012 15:42:19 GMTCentOS 5 machines running a MySQL version newer than the one supplied with the OS may have trouble installing MySQL-python through yum or rpm. Both report that libmysqlclient_r.so.15 is missing…https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%9C%E0%B8%B9%E0%B9%89%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95/https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%9C%E0%B8%B9%E0%B9%89%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95/Sun, 17 Jun 2012 10:51:33 GMTYou can store contacts in the system instead of writing them on paper, making them easier to find. Follow these steps to add contacts to the system. Select Address book.https://www.ezylinux.com/en/%E0%B8%82%E0%B9%89%E0%B8%AD%E0%B8%88%E0%B8%B3%E0%B8%81%E0%B8%B1%E0%B8%94-funambol-outlook-sync-client-%E0%B8%81%E0%B8%B1%E0%B8%9A-zimbra-hosting/https://www.ezylinux.com/en/%E0%B8%82%E0%B9%89%E0%B8%AD%E0%B8%88%E0%B8%B3%E0%B8%81%E0%B8%B1%E0%B8%94-funambol-outlook-sync-client-%E0%B8%81%E0%B8%B1%E0%B8%9A-zimbra-hosting/Sat, 16 Jun 2012 02:18:55 GMTSynchronizing calendar, contact, and task data between Microsoft Outlook and our Zimbra server has a limitation because the Funambol Outlook Sync client plugin does not support Outlook.https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%88%E0%B8%B1%E0%B8%94%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%A5%E0%B8%B2%E0%B8%A2%E0%B9%80%E0%B8%8B%E0%B9%87%E0%B8%99%E0%B8%95%E0%B9%8C%E0%B8%9A%E0%B8%99-zimbra-mail-server/https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%88%E0%B8%B1%E0%B8%94%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B8%A5%E0%B8%B2%E0%B8%A2%E0%B9%80%E0%B8%8B%E0%B9%87%E0%B8%99%E0%B8%95%E0%B9%8C%E0%B8%9A%E0%B8%99-zimbra-mail-server/Fri, 01 Jun 2012 17:25:50 GMTZimbra webmail users can easily manage signature templates and create more than one template, which is convenient for users who need multiple signature templates.https://www.ezylinux.com/en/limiting-scp-bandwidth-usage/https://www.ezylinux.com/en/limiting-scp-bandwidth-usage/Thu, 31 May 2012 08:03:47 GMTscp copies files between machines and can saturate links between sites. Use -l to limit bandwidth in Kbit/s.https://www.ezylinux.com/en/forward-incoming-email-to-another-email-on-zimbra-mail-server/https://www.ezylinux.com/en/forward-incoming-email-to-another-email-on-zimbra-mail-server/Fri, 25 May 2012 17:55:42 GMTZimbra incoming email forwarding lets users set up forwarding themselves without administrator management, allowing them to freely forward email to other accounts.https://www.ezylinux.com/en/mysql-server-hardware-os-and-configuration-tuning-tips/https://www.ezylinux.com/en/mysql-server-hardware-os-and-configuration-tuning-tips/Sun, 20 May 2012 14:59:38 GMTMySQL server hardware, OS and configuration tuning tips. Hardware and OS: use a 64-bit OS to support more memory. Do not use software RAID. Avoid RAID 5 and use RAID 10 instead. A battery-backed…https://www.ezylinux.com/en/android-sync-calendar-contact-email-zimbra-mail-server/https://www.ezylinux.com/en/android-sync-calendar-contact-email-zimbra-mail-server/Tue, 01 May 2012 17:01:03 GMTAndroid phones can work fully with Zimbra Mail Server, syncing contacts, calendars and email without installing additional software.https://www.ezylinux.com/en/%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1-calendar-zimbra-mail-server-%E0%B8%9A%E0%B8%99-iphone/https://www.ezylinux.com/en/%E0%B9%80%E0%B8%9E%E0%B8%B4%E0%B9%88%E0%B8%A1-calendar-zimbra-mail-server-%E0%B8%9A%E0%B8%99-iphone/Fri, 13 Apr 2012 17:14:23 GMTUsers of the OpenSource edition of Zimbra can add their Zimbra Calendar to an iPhone by configuring it as follows: go to the system setting menu and select Mail, Contacts, Calendars. Press…https://www.ezylinux.com/en/mass-killing-mysql-connections/https://www.ezylinux.com/en/mass-killing-mysql-connections/Fri, 13 Apr 2012 14:07:25 GMTToo many MySQL connections or locked tables can slow a server. Mass-killing selected stalled connections can restore service with minimal downtime.https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%83%E0%B8%8A%E0%B9%89%E0%B8%87%E0%B8%B2%E0%B8%99-zimbra-webmail/https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%83%E0%B8%8A%E0%B9%89%E0%B8%87%E0%B8%B2%E0%B8%99-zimbra-webmail/Wed, 11 Apr 2012 15:16:33 GMTAccessing Email through Web Mail: enter http://webmail.yourdomain.com in a Web browser's URL field to see the login page, then enter your Username.https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-%E0%B8%9B%E0%B8%A3%E0%B8%B6%E0%B8%81%E0%B8%A9%E0%B8%B2-zimbra-mail-server-zimbra-collaboration-server-zcs/https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-%E0%B8%9B%E0%B8%A3%E0%B8%B6%E0%B8%81%E0%B8%A9%E0%B8%B2-zimbra-mail-server-zimbra-collaboration-server-zcs/Mon, 02 Apr 2012 08:55:03 GMTZimbra Mail Server installation, troubleshooting, consulting, and training services. Zimbra Mail Server, or Zimbra Collaboration Server (ZCS), is a highly popular Email and Collaboration system.https://www.ezylinux.com/en/how-to-redirect-stderr-stdout-to-a-file/https://www.ezylinux.com/en/how-to-redirect-stderr-stdout-to-a-file/Sat, 31 Mar 2012 16:51:32 GMTManaging output is a common task in Linux. Commands often redirect errors and output to files so they can be stored and inspected later, especially commands…https://www.ezylinux.com/en/how-to-find-all-tables-use-particular-storage-engine-on-mysql/https://www.ezylinux.com/en/how-to-find-all-tables-use-particular-storage-engine-on-mysql/Thu, 08 Mar 2012 10:19:27 GMTMySQL supports various table engines, including MyISAM, InnoDB, MEMORY, and NDB. Finding which engine a table uses may seem complicated, but it is straightforward…https://www.ezylinux.com/en/how-to-list-the-files-from-rpm-package-by-rpm-or-yum-utils/https://www.ezylinux.com/en/how-to-list-the-files-from-rpm-package-by-rpm-or-yum-utils/Sat, 04 Feb 2012 10:43:21 GMTYou can list the files in an RPM package, whether installed or not, in two ways: rpm and repoquery. Here is how to use both commands…https://www.ezylinux.com/en/infographic-history-of-linux/https://www.ezylinux.com/en/infographic-history-of-linux/Mon, 12 Dec 2011 15:37:05 GMTHistory of Linux tells the story of Linux with a little GNU history, using an infographic to make it easier to read and understand. It also covers the OS's growth, especially in…https://www.ezylinux.com/en/enable-multiple-ssl-vhosts-on-a-single-ip-with-apache/https://www.ezylinux.com/en/enable-multiple-ssl-vhosts-on-a-single-ip-with-apache/Sun, 11 Dec 2011 16:32:03 GMTYears ago, enabling HTTPS with multiple SSL certificates on Apache port 443 seemed difficult. SNI, or Server Name Indication, makes it much easier…https://www.ezylinux.com/en/how-to-run-scheduled-command-on-the-last-day-of-every-month/https://www.ezylinux.com/en/how-to-run-scheduled-command-on-the-last-day-of-every-month/Sat, 26 Nov 2011 04:02:17 GMTLinux crontab alone cannot specify the last day of a month or its first Saturday. These scripts add that control to scheduled commands.https://www.ezylinux.com/en/how-to-broadcast-a-message-to-all-users-and-direct-message-to-some-user/https://www.ezylinux.com/en/how-to-broadcast-a-message-to-all-users-and-direct-message-to-some-user/Mon, 14 Nov 2011 15:06:12 GMTAdministrators have several ways to send messages to users logged in to a text-mode system. This article covers broadcasting to all users and sending directly to one user.https://www.ezylinux.com/en/mysql-replication-show-master-status-shows-empty-set-0-00-sec/https://www.ezylinux.com/en/mysql-replication-show-master-status-shows-empty-set-0-00-sec/Fri, 11 Nov 2011 17:09:00 GMTAfter preparing two servers for MySQL replication with identical data, the next step is setting up replication. This requires running show master status to check…https://www.ezylinux.com/en/install-openvz-os-level-virtualization-on-centos/https://www.ezylinux.com/en/install-openvz-os-level-virtualization-on-centos/Wed, 05 Oct 2011 04:49:07 GMTOpenVZ is an OS-level server virtualization solution, also called container virtualization. It is popular for Virtual Private Servers (VPSs), each called a container.https://www.ezylinux.com/en/%E0%B9%81%E0%B8%99%E0%B8%B0%E0%B8%99%E0%B8%B3-putty-manager-tool/https://www.ezylinux.com/en/%E0%B9%81%E0%B8%99%E0%B8%B0%E0%B8%99%E0%B8%B3-putty-manager-tool/Mon, 03 Oct 2011 15:25:23 GMTFor PuTTY fans, I have a new tool to introduce. It is useful when you need several remote sessions and must run commands on multiple machines at once: Putty Manager. To use it, you need PuTTY…https://www.ezylinux.com/en/how-to-install-dig-host-and-nslookup-commands-on-your-system/https://www.ezylinux.com/en/how-to-install-dig-host-and-nslookup-commands-on-your-system/Sat, 10 Sep 2011 08:38:14 GMTIf dig, host, or nslookup is missing on your Linux machine, you may have used a minimal installation on CentOS 6 or RHEL 6, or selected no packages during installation.https://www.ezylinux.com/en/after-installed-directadmin-the-admin-user-cannot-login/https://www.ezylinux.com/en/after-installed-directadmin-the-admin-user-cannot-login/Sat, 10 Sep 2011 07:55:30 GMTIf you cannot log in to the control panel after installing DirectAdmin, admin may be missing from /usr/local/directadmin/data/admin/admin.list or the admin user directory may not exist.https://www.ezylinux.com/en/how-to-delete-messages-from-mail-queue/https://www.ezylinux.com/en/how-to-delete-messages-from-mail-queue/Fri, 09 Sep 2011 16:24:27 GMTHow to delete messages from the queues of different MTAs, using an example mail queue to show the available commands.https://www.ezylinux.com/en/format-ntfs-partition-on-external-hard-drive-from-centos-rhel-linux/https://www.ezylinux.com/en/format-ntfs-partition-on-external-hard-drive-from-centos-rhel-linux/Wed, 24 Aug 2011 16:04:25 GMTAfter writing about mounting NTFS on CentOS / RHEL, I wanted to share how Linux can format a hard disk with an NTFS filesystem without using Windows.https://www.ezylinux.com/en/how-to-mount-ntfs-filesystem-with-readwrite-support-on-centos-rhel-linux/https://www.ezylinux.com/en/how-to-mount-ntfs-filesystem-with-readwrite-support-on-centos-rhel-linux/Sun, 21 Aug 2011 15:55:12 GMTNTFS is a Windows filesystem. ntfs-3g, led by Szabolcs Szakacsits, provides read/write support without recompiling, including a free community edition.https://www.ezylinux.com/en/last-command-linux-%E0%B9%81%E0%B8%AA%E0%B8%94%E0%B8%87%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD-user-%E0%B8%97%E0%B8%B5%E0%B9%88-login/https://www.ezylinux.com/en/last-command-linux-%E0%B9%81%E0%B8%AA%E0%B8%94%E0%B8%87%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD-user-%E0%B8%97%E0%B8%B5%E0%B9%88-login/Fri, 19 Aug 2011 16:06:55 GMTWhen you need to check login details, what comes to mind first? Many would look in /var/log/secure because it stores login history, but that can be cumbersome…https://www.ezylinux.com/en/install-cyanogenmod-7-gingerbread-android-2-3-5-%E0%B8%9A%E0%B8%99-motorola-defy/https://www.ezylinux.com/en/install-cyanogenmod-7-gingerbread-android-2-3-5-%E0%B8%9A%E0%B8%99-motorola-defy/Sun, 14 Aug 2011 11:04:56 GMTAfter using Motorola Defy with CyanogenMod 7 Gingerbread (Android 2.3.5) for a few months, today I am sharing how to install it on Motorola Defy, as promised…https://www.ezylinux.com/en/setup-a-transparent-proxy-over-ssl-https-with-squid/https://www.ezylinux.com/en/setup-a-transparent-proxy-over-ssl-https-with-squid/Wed, 10 Aug 2011 04:28:07 GMTMost Squid transparent proxy tutorials cover only HTTP on port 80. Squid can also proxy HTTPS on port 443, but forwarding it directly to port 3128 does not work.https://www.ezylinux.com/en/how-to-build-rpm-package-for-the-coova-chilli-with-centos-5/https://www.ezylinux.com/en/how-to-build-rpm-package-for-the-coova-chilli-with-centos-5/Sun, 24 Jul 2011 09:22:56 GMTCoova chilli is hotspot software that I believe branched from Chilli hotspot, which appears to have stopped development. RPM files for RedHat Enterprise or CentOS can be hard to find.https://www.ezylinux.com/en/how-to-jailbreak-iphone-ipod-touch-and-ipad-with-jailbreakme/https://www.ezylinux.com/en/how-to-jailbreak-iphone-ipod-touch-and-ipad-with-jailbreakme/Mon, 11 Jul 2011 16:37:38 GMTJailbreaking an iPhone, iPod touch, or iPad is now easy, without needing to know how to enter DFU mode. Thanks to the creators of JailbreakMe.com.https://www.ezylinux.com/en/how-to-install-linux-usb-drives-using-unetbootin-tool/https://www.ezylinux.com/en/how-to-install-linux-usb-drives-using-unetbootin-tool/Sun, 10 Jul 2011 06:28:29 GMTUNetbootin creates a Linux Live USB on a flash drive from a downloaded ISO file or one it downloads from the Internet. It supports distributions including Ubuntu.https://www.ezylinux.com/en/centos-6-is-available-in-a-few-days/https://www.ezylinux.com/en/centos-6-is-available-in-a-few-days/Sat, 09 Jul 2011 09:29:56 GMTAnyone waiting for CentOS version 6 should follow the news closely. CentOS has already allowed mirrors to sync its files, so downloads should be available within a day or two…https://www.ezylinux.com/en/squid-fatal-error-could-not-determine-fully-qualified-hostname/https://www.ezylinux.com/en/squid-fatal-error-could-not-determine-fully-qualified-hostname/Thu, 07 Jul 2011 11:22:49 GMTIf a newly installed proxy server reports an error when starting Squid, check whether it can resolve its own hostname to an IP address.https://www.ezylinux.com/en/htc-flyer-7-inch-android-tablet-hands-on/https://www.ezylinux.com/en/htc-flyer-7-inch-android-tablet-hands-on/Sun, 26 Jun 2011 13:23:46 GMTI bought an HTC Flyer after visiting Fortune to look for an iPad 2. Authorized shops had none in stock, and the Flyer's pen and interface appealed to me.https://www.ezylinux.com/en/managing-cyrus-imap-server-cyrus-system-administration/https://www.ezylinux.com/en/managing-cyrus-imap-server-cyrus-system-administration/Sat, 25 Jun 2011 01:37:16 GMTCyrus IMAP is a well-known POP3 and IMAP server that can also act as an MDA, or Mail Delivery Agent. These commands manage its configuration and troubleshoot problems.https://www.ezylinux.com/en/openldap-with-red-hat-6-ldapadd-ldap_bind-invalid-credentials-49/https://www.ezylinux.com/en/openldap-with-red-hat-6-ldapadd-ldap_bind-invalid-credentials-49/Sat, 11 Jun 2011 16:54:26 GMTOpenLDAP in Red Hat Enterprise Linux 6 uses a new configuration layout. Users familiar with version 5 may see ldap_bind: Invalid credentials (49) when running ldapadd or ldapsearch.https://www.ezylinux.com/en/how-to-install-dell-openmanage-server-administrator-omsa/https://www.ezylinux.com/en/how-to-install-dell-openmanage-server-administrator-omsa/Mon, 06 Jun 2011 05:49:51 GMTDell OpenManage Server Administrator (OMSA) monitors hardware and alerts, helps troubleshoot hardware, configures RAID, and integrates with monitoring software.https://www.ezylinux.com/en/how-to-rebuild-corrupted-rpm-database/https://www.ezylinux.com/en/how-to-rebuild-corrupted-rpm-database/Fri, 27 May 2011 17:46:09 GMTToday I repeatedly used yum to install, update, and erase packages. It then hung for a long time during an uninstall. Wondering why it was taking so long, I checked its process…https://www.ezylinux.com/en/upgrade-lg-optimus-one-p500-to-cyanogenmod-7-gingerbread-android-2-3-3/https://www.ezylinux.com/en/upgrade-lg-optimus-one-p500-to-cyanogenmod-7-gingerbread-android-2-3-3/Thu, 12 May 2011 14:22:06 GMTMany Optimus One users have already moved to Gingerbread. For those who want to upgrade without waiting for LG's official ROM, this article explains the process.https://www.ezylinux.com/en/how-to-configure-active-directory-authentication-with-apache-web-server/https://www.ezylinux.com/en/how-to-configure-active-directory-authentication-with-apache-web-server/Thu, 05 May 2011 13:02:45 GMTAuthentication through Active Directory or LDAP is convenient and makes it easier to manage users within an organization. Apache supports AD authentication with a few configuration changes.https://www.ezylinux.com/en/how-to-integrate-clamav-into-pure-ftpd-for-virus-scanning/https://www.ezylinux.com/en/how-to-integrate-clamav-into-pure-ftpd-for-virus-scanning/Fri, 15 Apr 2011 08:10:12 GMTOne problem in website administration is a webmaster's computer becoming infected with a virus or Trojan without their knowledge. Uploaded scripts or HTML files may then contain malicious code.https://www.ezylinux.com/en/rpm-repository-of-rpm-add-on-packages-for-red-hat-enterprise-linux-and-centos/https://www.ezylinux.com/en/rpm-repository-of-rpm-add-on-packages-for-red-hat-enterprise-linux-and-centos/Sat, 02 Apr 2011 15:37:12 GMTA collection of RPM repositories useful when you need packages unavailable on the installation media or in the base repository for Red Hat Enterprise Linux and CentOS. RPMforge installation commands: RHEL6 / CentOS-6, i386…https://www.ezylinux.com/en/red-hat-changes-its-distribution-policy/https://www.ezylinux.com/en/red-hat-changes-its-distribution-policy/Sat, 26 Mar 2011 11:55:59 GMTRed Hat has changed its RHEL kernel patch distribution policy: it applies patches first, then releases the kernel source as a single tarball.https://www.ezylinux.com/en/restrict-some-users-to-sending-mail-only-to-internal-domain/https://www.ezylinux.com/en/restrict-some-users-to-sending-mail-only-to-internal-domain/Tue, 22 Mar 2011 17:41:01 GMTPostfix is a highly flexible MTA. This article explains how to restrict selected users to sending mail only to specified domains or within the company.https://www.ezylinux.com/en/multitouch-configuration-for-apple-magic-trackpad-and-ubuntu-10-10-maverick/https://www.ezylinux.com/en/multitouch-configuration-for-apple-magic-trackpad-and-ubuntu-10-10-maverick/Sun, 20 Mar 2011 16:47:36 GMTApple Magic TrackPad is an interesting device that can be more flexible than an ordinary mouse, depending on the support provided by the OS and driver. On Windows, you can use Magic TrackPad…https://www.ezylinux.com/en/preventing-thwart-ssh-attacks-with-denyhosts/https://www.ezylinux.com/en/preventing-thwart-ssh-attacks-with-denyhosts/Mon, 14 Mar 2011 16:29:42 GMTSoon after a server connects to the Internet, people begin trying to log in over SSH. If root login is allowed and the password is easy, the server may be compromised.https://www.ezylinux.com/en/how-to-saverestore-and-backup-iptables-rules/https://www.ezylinux.com/en/how-to-saverestore-and-backup-iptables-rules/Sat, 12 Mar 2011 17:05:12 GMTToday I will cover a simple topic for anyone unfamiliar with the commands for saving, backing up, and restoring iptables rules. This article does not cover the iptables GUI. One problem with Linux iptables is that restarting…https://www.ezylinux.com/en/how-to-install-clamav-on-centos-5-rhel-5/https://www.ezylinux.com/en/how-to-install-clamav-on-centos-5-rhel-5/Wed, 02 Mar 2011 05:44:17 GMTClamAV is an open source antivirus widely used on Linux and Unix. This free antivirus integrates well with services and offers flexible configuration.https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5-root-motorola-defy-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-superoneclick-for-2-1/https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5-root-motorola-defy-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-superoneclick-for-2-1/Sat, 19 Feb 2011 06:38:12 GMTMotorola Defy is a popular Android phone, and I use one myself. Limitations of Android 2.1, including the lack of wireless tethering, led me to root it.https://www.ezylinux.com/en/jailbreak-iphone-ipad-%E0%B9%81%E0%B8%A5%E0%B8%B0-ipod-touch-ios-4-2-1-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-greenpois0n/https://www.ezylinux.com/en/jailbreak-iphone-ipad-%E0%B9%81%E0%B8%A5%E0%B8%B0-ipod-touch-ios-4-2-1-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-greenpois0n/Mon, 07 Feb 2011 13:05:25 GMTChronic Dev Team released Greenpois0n for jailbreaking iOS 4.2.1 on iPhone4 / iPhone 3GS, iPod Touch 4G, iPod Touch 3G, and iPad.https://www.ezylinux.com/en/red-hat-enterprise-linux-6-released/https://www.ezylinux.com/en/red-hat-enterprise-linux-6-released/Fri, 12 Nov 2010 10:05:08 GMTRed Hat Enterprise Linux 6, or RHEL 6, has officially launched. It combines code from Fedora 12 and 13, with kernel version 2.6.32 at its core…https://www.ezylinux.com/en/ubuntu-10-10-maverick-meerkat-now-available-for-download/https://www.ezylinux.com/en/ubuntu-10-10-maverick-meerkat-now-available-for-download/Mon, 11 Oct 2010 12:03:19 GMTCanonical has announced Ubuntu 10.10, the latest Ubuntu Linux release, available in desktop, netbook, and server editions.https://www.ezylinux.com/en/opensuse-launches-smeegol-os-based-on-meego-interface/https://www.ezylinux.com/en/opensuse-launches-smeegol-os-based-on-meego-interface/Fri, 08 Oct 2010 17:32:18 GMTSmeegol Linux is a new OpenSUSE release incorporating MeeGo technologies, designed for netbooks, entry-level desktops, handheld computing and communications devices.https://www.ezylinux.com/en/ubuntu-shows-off-prototype-technology-based-on-computer-vision/https://www.ezylinux.com/en/ubuntu-shows-off-prototype-technology-based-on-computer-vision/Wed, 06 Oct 2010 14:39:51 GMTCanonical, the maker of Ubuntu Linux, demonstrated prototype technology that takes webcam input and analyzes the user's movements. Its underlying idea is similar to Nintendo Wii and Microsoft Kinect…https://www.ezylinux.com/en/%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD-antivirus-2011-free-%E0%B8%88%E0%B8%B3%E0%B8%AB%E0%B8%99%E0%B9%88%E0%B8%B2%E0%B8%A2-antivirus/https://www.ezylinux.com/en/%E0%B8%A3%E0%B8%B2%E0%B8%A2%E0%B8%8A%E0%B8%B7%E0%B9%88%E0%B8%AD-antivirus-2011-free-%E0%B8%88%E0%B8%B3%E0%B8%AB%E0%B8%99%E0%B9%88%E0%B8%B2%E0%B8%A2-antivirus/Thu, 23 Sep 2010 13:52:59 GMTAntivirus 2011 Free: A list of free antivirus software for 2011 to download without buying from an antivirus vendor. Antivirus is essential for Windows computers…https://www.ezylinux.com/en/ubuntu-10-04-live-cd-with-built-in-gma-500-support/https://www.ezylinux.com/en/ubuntu-10-04-live-cd-with-built-in-gma-500-support/Fri, 23 Jul 2010 10:02:34 GMTNotebook users with Intel GMA 500 graphics who want to use Ubuntu may be frustrated that Ubuntu still does not include its driver. Someone has made an Ubuntu 10.04 live CD…https://www.ezylinux.com/en/how-to-update-the-max_connections-in-mysql/https://www.ezylinux.com/en/how-to-update-the-max_connections-in-mysql/Tue, 20 Jul 2010 09:38:23 GMTThe "too many connections" error during a database query occurs when the number of connections exceeds max_connections. MySQL normally allows…https://www.ezylinux.com/en/how-to-change-host-id-for-linux/https://www.ezylinux.com/en/how-to-change-host-id-for-linux/Fri, 16 Jul 2010 11:02:42 GMTThe hostid command displays a Linux machine's ID. Linux generates a host ID at installation, and reinstalling generates a different one, which can affect software licenses tied to it.https://www.ezylinux.com/en/download-packages-using-yum-command/https://www.ezylinux.com/en/download-packages-using-yum-command/Sat, 03 Jul 2010 13:30:11 GMTYum installs packages online on Red Hat Linux distributions, much like apt-get on Debian or Ubuntu, and handles package dependencies.https://www.ezylinux.com/en/proxy-auto-configuration-pac-proxy-auto-config/https://www.ezylinux.com/en/proxy-auto-configuration-pac-proxy-auto-config/Thu, 24 Jun 2010 15:29:17 GMTThis may be familiar to many readers, but it was new to me: using a proxy for selected websites while connecting directly to others with proxy auto-configuration.https://www.ezylinux.com/en/different-types-of-kernel-packages-in-red-hat-enterprise-linux/https://www.ezylinux.com/en/different-types-of-kernel-packages-in-red-hat-enterprise-linux/Sat, 12 Jun 2010 11:21:12 GMTRed Hat provides several kernel packages with different capabilities. Installing an unsuitable kernel can prevent the system from recognizing all installed hardware.https://www.ezylinux.com/en/red-hat-launched-red-hat-enterprise-linux-5-update-5-rhel5-5/https://www.ezylinux.com/en/red-hat-launched-red-hat-enterprise-linux-5-update-5-rhel5-5/Tue, 06 Apr 2010 08:41:54 GMTLast Wednesday, Red Hat released update 5, the latest update to Red Hat Enterprise Linux 5, adding support for new hardware platforms and improving virtualization.https://www.ezylinux.com/en/red-hat-enterprise-virtualization-rhev/https://www.ezylinux.com/en/red-hat-enterprise-virtualization-rhev/Mon, 15 Mar 2010 09:43:12 GMTVirtualization technology is now widely used, most commonly for VPS, or Virtual Private Server, hosting. There are many virtualization software products.https://www.ezylinux.com/en/how-to-configure-service-dependency-in-red-hat-cluster-suite/https://www.ezylinux.com/en/how-to-configure-service-dependency-in-red-hat-cluster-suite/Tue, 09 Mar 2010 15:05:29 GMTRed Hat failover clustering has an interesting feature for controlling a dependent service when its primary service starts or stops: the depend_mode attribute.https://www.ezylinux.com/en/add-windows-true-type-fonts-in-gnome-desktop/https://www.ezylinux.com/en/add-windows-true-type-fonts-in-gnome-desktop/Sun, 07 Feb 2010 17:11:12 GMTThis expands on step 2 of Add Thai fonts in Linux, explaining how to open Nautilus and browse to fonts:// to add Windows TrueType fonts to GNOME.https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5-jailbreak-ipod-touch-3-1-2-ipod-touch-2g/https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5-jailbreak-ipod-touch-3-1-2-ipod-touch-2g/Fri, 08 Jan 2010 07:04:13 GMTJailbreak iPod touch firmware 3.1.2 using blackra1n on Windows. A separate guide is also available for a full iOS 4.2.1 jailbreak.https://www.ezylinux.com/en/how-to-install-vlc-media-player-for-linux/https://www.ezylinux.com/en/how-to-install-vlc-media-player-for-linux/Fri, 13 Nov 2009 17:58:54 GMTVLC Media Player is a good program for watching movies and listening to music. One strength is that it can play incompletely downloaded media files, which ordinary programs cannot. Another advantage…https://www.ezylinux.com/en/how-to-install-google-chrome-in-fedora-linux/https://www.ezylinux.com/en/how-to-install-google-chrome-in-fedora-linux/Thu, 12 Nov 2009 19:14:13 GMTGoogle Chrome has been developed for Linux, but Google supplies an installation package for only one distribution, Ubuntu, so other distributions need alternative installation methods.https://www.ezylinux.com/en/convert-rpm-to-deb-or-deb-to-rpm/https://www.ezylinux.com/en/convert-rpm-to-deb-or-deb-to-rpm/Tue, 10 Nov 2009 15:20:14 GMTSometimes you need a package but only a package for another distribution is available. What can you do? This article explains converting RPM to DEB and DEB to RPM…https://www.ezylinux.com/en/how-to-get-flash-plugin-to-work-on-fedora-x86_64-64-bit/https://www.ezylinux.com/en/how-to-get-flash-plugin-to-work-on-fedora-x86_64-64-bit/Mon, 09 Nov 2009 05:22:37 GMTA 32-bit Adobe Flash plugin does not work in a 64-bit Linux browser. Replace it with Adobe's 64-bit Flash plugin.https://www.ezylinux.com/en/network-card-bonding-on-red-hat-linux-and-centos/https://www.ezylinux.com/en/network-card-bonding-on-red-hat-linux-and-centos/Sat, 03 Oct 2009 09:33:19 GMTChannel bonding combines network interface cards to increase bandwidth, provide failover or load balancing, or use 802.3ad port trunking. It also supports VLANs, or 802.1q.https://www.ezylinux.com/en/red-hat-4-5-take-a-very-long-time-to-boot-and-iostat-output-incorrect/https://www.ezylinux.com/en/red-hat-4-5-take-a-very-long-time-to-boot-and-iostat-output-incorrect/Mon, 28 Sep 2009 08:49:22 GMTSlow boots of more than two hours or incorrect iostat output, such as 200% CPU utilization, can occur on x86 or x86_64 because of mismatched timers.https://www.ezylinux.com/en/find-out-which-rpm-installed-a-specific-file-by-rpm-or-yum-command/https://www.ezylinux.com/en/find-out-which-rpm-installed-a-specific-file-by-rpm-or-yum-command/Sun, 20 Sep 2009 20:12:06 GMTUse rpm or yum to find which package installed a file or command. yum requires repository access unless the required data is already cached.https://www.ezylinux.com/en/downgrade-ipod-touch-iphone-from-3-1-1-to-3-0-firmware/https://www.ezylinux.com/en/downgrade-ipod-touch-iphone-from-3-1-1-to-3-0-firmware/Wed, 16 Sep 2009 15:45:34 GMTYou can now jailbreak iPod touch 3.1.2 (iPod touch 2G). Click here for the procedure. A few days ago, Apple released firmware 3.1.1 for iPod touch and iPhone…https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%94%E0%B8%B9-version-%E0%B8%82%E0%B8%AD%E0%B8%87-suse-linux-enterprise-%E0%B9%81%E0%B8%A5%E0%B8%B0-open-enterprise-server-for-linux/https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%94%E0%B8%B9-version-%E0%B8%82%E0%B8%AD%E0%B8%87-suse-linux-enterprise-%E0%B9%81%E0%B8%A5%E0%B8%B0-open-enterprise-server-for-linux/Wed, 09 Sep 2009 08:43:59 GMTUse `uname -r` to check the kernel version and compare it with the SUSE Linux Enterprise and Open Enterprise Server for Linux versions.https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%AD%E0%B9%88%E0%B8%B2%E0%B8%99-memory-usage-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-free-command/https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%AD%E0%B9%88%E0%B8%B2%E0%B8%99-memory-usage-%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2-free-command/Mon, 07 Sep 2009 08:15:30 GMTLinux uses RAM extensively to cache local and remote filesystem and disk data. The free command shows used, free, cached, and application memory.https://www.ezylinux.com/en/%E0%B8%9B%E0%B8%B1%E0%B8%8D%E0%B8%AB%E0%B8%B2%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%81%E0%B8%B4%E0%B8%94-mailbox-is-locked-by-pop-server/https://www.ezylinux.com/en/%E0%B8%9B%E0%B8%B1%E0%B8%8D%E0%B8%AB%E0%B8%B2%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%81%E0%B8%B4%E0%B8%94-mailbox-is-locked-by-pop-server/Wed, 02 Sep 2009 04:35:36 GMTCyrus-imapd commonly reports "Mailbox is locked by POP server" when more than one POP3 connection attempts to retrieve mail for the same user simultaneously.https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%94%E0%B8%B9-version-%E0%B8%82%E0%B8%AD%E0%B8%87-red-hat-enterprise-linux-centos-linux/https://www.ezylinux.com/en/%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B8%94%E0%B8%B9-version-%E0%B8%82%E0%B8%AD%E0%B8%87-red-hat-enterprise-linux-centos-linux/Thu, 27 Aug 2009 08:46:06 GMTCheck Red Hat Enterprise Linux or CentOS versions by reading /etc/redhat-release or using uname to identify the release from its kernel version.https://www.ezylinux.com/en/change-io-disk-scheduler-without-reboot/https://www.ezylinux.com/en/change-io-disk-scheduler-without-reboot/Sat, 22 Aug 2009 17:23:46 GMTThere are four I/O schedulers for hard disks and block devices: anticipatory, noop, deadline, and CFQ. CFQ is usually the default. To change the I/O scheduler…https://www.ezylinux.com/en/how-to-restore-defaults-gnome-desktop-environment/https://www.ezylinux.com/en/how-to-restore-defaults-gnome-desktop-environment/Mon, 17 Aug 2009 16:31:56 GMTRestore the default GNOME desktop environment: enter runlevel 3 with #init3, log in as root, go to the user's home directory, and remove .gnome* files.https://www.ezylinux.com/en/rhce-red-hat-certified-engineer-linux-study-guide-certification-press/https://www.ezylinux.com/en/rhce-red-hat-certified-engineer-linux-study-guide-certification-press/Sat, 15 Aug 2009 14:04:12 GMTRHCE Red Hat Certified Engineer Linux Study Guide provide a hundreds of practice questions and hands-on exercises. The RHCE Red Hat Certified Engineer Linux Study Guide is up to date for Red Hat Enterhttps://www.ezylinux.com/en/yum-yellow-dog-update-modified-and-how-to-use-yum/https://www.ezylinux.com/en/yum-yellow-dog-update-modified-and-how-to-use-yum/Sat, 15 Aug 2009 05:09:49 GMTYum, or Yellow dog Update, Modified, manages RPM package installation, removal, and updates, resolving dependencies from configured repositories.https://www.ezylinux.com/en/a-practical-guide-to-linux-commands-editors-and-shell-programming/https://www.ezylinux.com/en/a-practical-guide-to-linux-commands-editors-and-shell-programming/Thu, 13 Aug 2009 13:20:57 GMTA Practical Guide to Linux Commands, Editors, and Shell Programming is the most useful, most comprehensive Linux tutorial and reference you can find. A tutorial on fundamental Linux concepts and technhttps://www.ezylinux.com/en/why-cpu-stats-between-ps-and-top-command-are-different/https://www.ezylinux.com/en/why-cpu-stats-between-ps-and-top-command-are-different/Wed, 12 Aug 2009 18:11:41 GMTThe difference between CPU statistics from ps and top is that ps calculates CPU utilization as total CPU time divided by the task's running time, while top displays a percentage of overall CPU time…https://www.ezylinux.com/en/how-to-set-up-grub-to-boot-from-both-disks-of-mirrored-raid/https://www.ezylinux.com/en/how-to-set-up-grub-to-boot-from-both-disks-of-mirrored-raid/Wed, 12 Aug 2009 12:04:26 GMTOn Linux software RAID 1, GRUB normally boots from the primary disk. Configure it on the secondary disk too so the system can boot if the primary fails.https://www.ezylinux.com/en/how-to-configure-yum-show-availble-updates-from-exclude-list/https://www.ezylinux.com/en/how-to-configure-yum-show-availble-updates-from-exclude-list/Tue, 11 Aug 2009 16:34:24 GMTyum normally hides packages listed under exclude in yum.conf, so yum update does not show which newer versions are available for those packages.https://www.ezylinux.com/en/%E0%B8%84%E0%B8%AD%E0%B8%A1%E0%B8%9E%E0%B8%B4%E0%B8%A7%E0%B9%80%E0%B8%95%E0%B8%AD%E0%B8%A3%E0%B9%8C%E0%B8%84%E0%B8%A5%E0%B8%B1%E0%B8%AA%E0%B9%80%E0%B8%95%E0%B8%AD%E0%B8%A3%E0%B9%8C-computer-cluster/https://www.ezylinux.com/en/%E0%B8%84%E0%B8%AD%E0%B8%A1%E0%B8%9E%E0%B8%B4%E0%B8%A7%E0%B9%80%E0%B8%95%E0%B8%AD%E0%B8%A3%E0%B9%8C%E0%B8%84%E0%B8%A5%E0%B8%B1%E0%B8%AA%E0%B9%80%E0%B8%95%E0%B8%AD%E0%B8%A3%E0%B9%8C-computer-cluster/Tue, 11 Aug 2009 09:13:24 GMTA computer cluster is a group of connected computers that work together as if they were one computer. Each machine connects through a fast local area network. Clusters are generally…https://www.ezylinux.com/en/%E0%B8%AA%E0%B8%AD%E0%B8%9A-rhct-rhct-training-rhct-exam-red-hat-certified-technician/https://www.ezylinux.com/en/%E0%B8%AA%E0%B8%AD%E0%B8%9A-rhct-rhct-training-rhct-exam-red-hat-certified-technician/Sun, 09 Aug 2009 16:38:02 GMTRHCT Certification tests operational and system administration skills using the command line or administrative tools, including installing Red Hat OS, system checks, maintenance, and troubleshooting.https://www.ezylinux.com/en/build-custome-suse-versions-from-suse-studio/https://www.ezylinux.com/en/build-custome-suse-versions-from-suse-studio/Wed, 05 Aug 2009 03:52:25 GMTSUSE Linux has introduced SUSE Studio, a web-based tool for creating custom SUSE Linux operating systems and applications based on SUSE Linux. At first I thought…https://www.ezylinux.com/en/vulnerability-in-firefox-3-5-1-still-bug-with-javascript/https://www.ezylinux.com/en/vulnerability-in-firefox-3-5-1-still-bug-with-javascript/Sun, 19 Jul 2009 19:22:48 GMTFirefox 3.5.1 fixed a JavaScript issue involving TraceMonkey. Subsequent reports of a security flaw were addressed by Mozilla, which said the issue did not affect security.https://www.ezylinux.com/en/mandriva-flash-2009-spring-linux-on-flash-drive/https://www.ezylinux.com/en/mandriva-flash-2009-spring-linux-on-flash-drive/Fri, 17 Jul 2009 17:26:58 GMTMandriva* released an 8GB flash drive containing Mandriva 2009 Spring edition, a portable Linux OS with a Windows-style desktop and bundled applications.https://www.ezylinux.com/en/set-up-quota-limits-per-user-on-cups-printer-server/https://www.ezylinux.com/en/set-up-quota-limits-per-user-on-cups-printer-server/Wed, 15 Jul 2009 19:46:47 GMTLinux and Unix use CUPS as a print server. CUPS cannot set individual quotas directly, but allow/deny rules for users and groups can provide similar behavior.https://www.ezylinux.com/en/enable-core-dumps-for-daemons-or-services-in-red-hat-enterprise-linux/https://www.ezylinux.com/en/enable-core-dumps-for-daemons-or-services-in-red-hat-enterprise-linux/Sun, 12 Jul 2009 18:47:09 GMTDaemons normally run as background processes and can be started with service commands or init scripts. Core dumps help debug programs and investigate errors.https://www.ezylinux.com/en/google-chrome-os-success-or-fail/https://www.ezylinux.com/en/google-chrome-os-success-or-fail/Fri, 10 Jul 2009 16:08:03 GMTGoogle Chrome OS is Linux-based, with a different interface and faster operation. Its opportunity to compete with Windows may be on netbooks.https://www.ezylinux.com/en/install-ipod-touch-iphone-app-from-internet-without-itune/https://www.ezylinux.com/en/install-ipod-touch-iphone-app-from-internet-without-itune/Sun, 05 Jul 2009 14:21:17 GMTThere are several ways to install iPod touch and iPhone apps without iTunes. This article explains installation over the Internet on a jailbroken device with Cydia.https://www.ezylinux.com/en/linux-virtualization-hypervisor-kernel-based-virtual-machine-kvm-raleased-87/https://www.ezylinux.com/en/linux-virtualization-hypervisor-kernel-based-virtual-machine-kvm-raleased-87/Wed, 01 Jul 2009 15:53:36 GMTOn the 25th of last month, KVM released LVM Release 87, focusing on qemu performance, improved live migration, and configurable qcow2 cluster sizes.https://www.ezylinux.com/en/yellow-dog-linux-ydl-62-released/https://www.ezylinux.com/en/yellow-dog-linux-ydl-62-released/Tue, 30 Jun 2009 18:55:21 GMTYellow Dog Linux is familiar to many Linux enthusiasts. Like CentOS, it is a Red Hat clone, but is based only on PowerPC and Cell architectures.https://www.ezylinux.com/en/htc-hero-android-platform-with-flash-support/https://www.ezylinux.com/en/htc-hero-android-platform-with-flash-support/Thu, 25 Jun 2009 10:26:35 GMTHTC recently introduced HTC Hero, an Android platform phone. It supports Flash, which iPhone and iPod touch do not yet support. Another appealing feature is pinch-to-zoom…https://www.ezylinux.com/en/wrt160nl-linux-based-wireless-n-router-with-storage-link/https://www.ezylinux.com/en/wrt160nl-linux-based-wireless-n-router-with-storage-link/Wed, 24 Jun 2009 11:25:23 GMTLinksys has released a new Linux-based wireless router supporting 802.11n, following the success of the WRT54GL, which can run firmware with additional features…https://www.ezylinux.com/en/firefox-35-rc2-release-candidate-2-released/https://www.ezylinux.com/en/firefox-35-rc2-release-candidate-2-released/Mon, 22 Jun 2009 17:30:29 GMTFirefox 3.5 RC2 is available for Windows, Mac, and Linux, following Firefox 3.5 beta 4 in April, with the final release expected this month.https://www.ezylinux.com/en/install-ipa-file-iphone-ipod-touch-30-from-itune-sync/https://www.ezylinux.com/en/install-ipa-file-iphone-ipod-touch-30-from-itune-sync/Sun, 21 Jun 2009 14:06:14 GMTInstall IPA files on iPhone 2G/3G and iPod touch first/second generation with firmware 3.0 by installing AppSync 3.0 after jailbreaking, then syncing through iTunes.https://www.ezylinux.com/en/jailbreak-ipod-touch-2nd-gen-30-firmware-7a341/https://www.ezylinux.com/en/jailbreak-ipod-touch-2nd-gen-30-firmware-7a341/Sat, 20 Jun 2009 14:35:39 GMTA complete iOS 4.2.1 jailbreak is now available for iPhone 4 / iPhone 3GS, iPod Touch 4G, iPod Touch 3G, and iPad. Jailbreaking iPod touch 3.1.2 (iPod touch 2G) is also possible. Click here for the procedure…https://www.ezylinux.com/en/how-to-jailbreak-ipod-touch-iphone-to-30-official-firmware/https://www.ezylinux.com/en/how-to-jailbreak-ipod-touch-iphone-to-30-official-firmware/Sat, 20 Jun 2009 13:55:26 GMTThe dependable iPhone Dev team have released updated version of their redsn0w to jailbreak official firmware iPhone OS 3.0 and iPod touch 1st, 2nd for windows. The Step to Jailbreak iPod touch or https://www.ezylinux.com/en/red-hat-kvm-virtualization-suite-be-released-in-rhel-5_4/https://www.ezylinux.com/en/red-hat-kvm-virtualization-suite-be-released-in-rhel-5_4/Sat, 20 Jun 2009 08:43:43 GMTRed Hat has decided to switch its virtualization platform from Xen to KVM, starting with RHEL 5.4 in August 2009. Xen will remain supported in existing RHEL versions until the end of each product life cycle…https://www.ezylinux.com/en/how-to-disable-firewall-on-red-hat-enterprise-linux-centos/https://www.ezylinux.com/en/how-to-disable-firewall-on-red-hat-enterprise-linux-centos/Fri, 19 Jun 2009 10:57:02 GMTRed Hat Enterprise's firewall uses iptables, like other Linux distributions such as CentOS, Debian, SUSE, and Ubuntu. To enable or disable the firewall in Red Hat…https://www.ezylinux.com/en/%E0%B8%AA%E0%B8%AD%E0%B8%9A-rhce-%E0%B8%AA%E0%B8%AD%E0%B8%9A-cert-red-hat-red-hat-certified-rhce/https://www.ezylinux.com/en/%E0%B8%AA%E0%B8%AD%E0%B8%9A-rhce-%E0%B8%AA%E0%B8%AD%E0%B8%9A-cert-red-hat-red-hat-certified-rhce/Fri, 19 Jun 2009 10:15:07 GMTRed Hat has changed the RHCE certification exam rules. It now has one 3.5-hour section, replacing the previous two sections lasting 5.5 hours in total.https://www.ezylinux.com/en/red-hat-enterprise-linux-6-rhel6-impacted-by-fedora-10/https://www.ezylinux.com/en/red-hat-enterprise-linux-6-rhel6-impacted-by-fedora-10/Thu, 18 Jun 2009 19:52:27 GMTRed Hat plans to base Red Hat Enterprise Linux 6 on Fedora 10, with release expected in the first quarter of 2010.https://www.ezylinux.com/en/rhcerhct-troubleshooting-scenarios-leaked/https://www.ezylinux.com/en/rhcerhct-troubleshooting-scenarios-leaked/Thu, 18 Jun 2009 18:10:01 GMTWhile browsing the web today, I came across a file that startled me: I thought it was an RHCT/RHCE exam file, available only to examiners (RHCX). After reading the details…https://www.ezylinux.com/en/red-hat-rhce-rhct-certification-training-course-exam/https://www.ezylinux.com/en/red-hat-rhce-rhct-certification-training-course-exam/Thu, 18 Jun 2009 15:29:53 GMTRHCE and RHCT are widely recognized certifications with demanding practical exams and limited time. Many candidates do not pass on the first attempt.https://www.ezylinux.com/en/what-is-smartd-and-how-to-use-it/https://www.ezylinux.com/en/what-is-smartd-and-how-to-use-it/Wed, 17 Jun 2009 12:32:15 GMTsmartd monitors hard disks using SMART, or Self-Monitoring, Analysis, and Reporting Technology, to analyze, check, report status, and predict whether a hard disk…https://www.ezylinux.com/en/disable-the-auto-complete-feature-of-the-bash-shell/https://www.ezylinux.com/en/disable-the-auto-complete-feature-of-the-bash-shell/Tue, 16 Jun 2009 10:50:31 GMTOne advantage of Bash is auto-completion, which saves typing every character of a command or filename. This article covers two ways to disable it…https://www.ezylinux.com/en/enable-telnet-in-linux-server/https://www.ezylinux.com/en/enable-telnet-in-linux-server/Fri, 05 Jun 2009 06:00:22 GMTLinux does not enable Telnet because it is insecure, using SSH instead. To install and enable Telnet, install the telnet-server package.https://www.ezylinux.com/en/enable-dynamic-cpu-speed-scaling-in-linux/https://www.ezylinux.com/en/enable-dynamic-cpu-speed-scaling-in-linux/Thu, 04 Jun 2009 15:13:50 GMTLinux's cpuspeed power-saving technology has developed since Intel and AMD began adding DVS (dynamic voltage scaling) to CPUs, adjusting CPU voltage to reduce power use.https://www.ezylinux.com/en/controlling-core-dump-files-in-linux/https://www.ezylinux.com/en/controlling-core-dump-files-in-linux/Wed, 27 May 2009 17:25:26 GMTCore dumps are created when programs crash or access unauthorized memory, helping programmers debug problems. Linux provides settings to control their size, names, and location.https://www.ezylinux.com/en/moblin-and-android-linux-os-for-mobile-device/https://www.ezylinux.com/en/moblin-and-android-linux-os-for-mobile-device/Mon, 25 May 2009 18:34:50 GMTNetbooks and mobile devices are gaining popularity. Linux operating systems for limited-resource devices have developed over the last few years, and competition between Intel's Moblin and Google's Android is expected this year.https://www.ezylinux.com/en/get-squid-performance-statistic-from-command-line/https://www.ezylinux.com/en/get-squid-performance-statistic-from-command-line/Mon, 25 May 2009 17:44:18 GMTTo inspect Squid's operation, use squidclient to request information from Squid. Squid is a proxy server program for Linux or Unix…https://www.ezylinux.com/en/how-large-is-the-virtual-address-space-for-a-process/https://www.ezylinux.com/en/how-large-is-the-virtual-address-space-for-a-process/Thu, 14 May 2009 15:28:41 GMTIn Linux, choosing a CPU and kernel suited to the application's requirements helps the system run stably. x86_64 (AMD64, EM64T) processors are 64-bit processors…https://www.ezylinux.com/en/rescan-scsi-to-add-remove-scsi-device-without-rebooting/https://www.ezylinux.com/en/rescan-scsi-to-add-remove-scsi-device-without-rebooting/Mon, 11 May 2009 14:58:42 GMTTo rescan an entire SCSI bus and re-register all devices found: rescan SCSI so the system sees a new device. On some Linux systems, this also adds or removes devices.https://www.ezylinux.com/en/how-to-know-x86-system-capable-running-64-bit-software/https://www.ezylinux.com/en/how-to-know-x86-system-capable-running-64-bit-software/Sat, 09 May 2009 16:49:31 GMTHow can you tell whether your system supports 64-bit, 32-bit, or 16-bit applications? This article explains Long mode and Legacy mode.https://www.ezylinux.com/en/free-memory-by-flushing-pagecache-and-slabcache/https://www.ezylinux.com/en/free-memory-by-flushing-pagecache-and-slabcache/Tue, 05 May 2009 14:33:52 GMTYou can free memory on demand with a simple command that clears the Linux pagecache and slabcache. Write 1 to free pagecache, 2 to free…https://www.ezylinux.com/en/how-to-increase-the-io-priority-of-processes/https://www.ezylinux.com/en/how-to-increase-the-io-priority-of-processes/Sun, 03 May 2009 15:42:10 GMTIn Linux, you can increase or decrease I/O access priority per process with ionice, which displays and changes the I/O scheduling class and priority of a process…https://www.ezylinux.com/en/set-passwords-policy-against-a-dictionary/https://www.ezylinux.com/en/set-passwords-policy-against-a-dictionary/Thu, 12 Mar 2009 09:50:50 GMTLinux provides a module for password policy that prevents users from choosing easily guessed passwords. It is the pam_cracklib.so module in PAM.https://www.ezylinux.com/en/autofs-version-5-features/https://www.ezylinux.com/en/autofs-version-5-features/Thu, 12 Mar 2009 08:44:22 GMTThe new autofs version (autofs5) adds features that improve interoperability with other systems. The new features include: Direct map support, which provides a mechanism to automatica…https://www.ezylinux.com/en/increase-the-virtual-console-resolution/https://www.ezylinux.com/en/increase-the-virtual-console-resolution/Sun, 08 Mar 2009 08:45:31 GMTThe virtual console normally displays 80x24 lines. For a higher resolution, edit /boot/grub/grub.conf and add a vga setting to the kernel line.https://www.ezylinux.com/en/find-information-on-the-maximum-amount-of-memory-that-system-can-handle/https://www.ezylinux.com/en/find-information-on-the-maximum-amount-of-memory-that-system-can-handle/Fri, 06 Mar 2009 14:16:09 GMTOn newer Linux systems, dmidecode reports the maximum memory capacity supported by the system BIOS.https://www.ezylinux.com/en/find-which-rpm-contains-a-specific-file/https://www.ezylinux.com/en/find-which-rpm-contains-a-specific-file/Fri, 06 Mar 2009 14:07:16 GMTOn Red Hat systems, use rpm, yum, or up2date to find which RPM package contains a particular file.https://www.ezylinux.com/en/install-third-party-nvidia-graphics-drivers-in-kernel-xen/https://www.ezylinux.com/en/install-third-party-nvidia-graphics-drivers-in-kernel-xen/Mon, 02 Mar 2009 04:34:34 GMTFollow these steps to install Nvidia graphics drivers, starting with # telinit 3 to enter init 3.https://www.ezylinux.com/en/how-to-use-wpa_cli-command/https://www.ezylinux.com/en/how-to-use-wpa_cli-command/Sun, 01 Mar 2009 04:25:15 GMTwpa_cli is included in the wpa_supplicant package. It checks status and changes configuration, including trigger events and passphrases for wireless connections.https://www.ezylinux.com/en/anti-spam-appliances/https://www.ezylinux.com/en/anti-spam-appliances/Sun, 15 Feb 2009 08:53:33 GMTAnti-spam appliances are hardware devices containing software to manage and fight email spam. They can serve as a mail server gateway or sit in front of the mail server.https://www.ezylinux.com/en/set-up-your-linux-for-wake-on-lan-wol/https://www.ezylinux.com/en/set-up-your-linux-for-wake-on-lan-wol/Tue, 03 Feb 2009 16:08:00 GMTWake on LAN starts a server through a network command from another machine. Configure both the server receiving the wake command and the client sending it.https://www.ezylinux.com/en/improve-mouse-tracking-in-a-virtual-machine-manager-virt-manager/https://www.ezylinux.com/en/improve-mouse-tracking-in-a-virtual-machine-manager-virt-manager/Tue, 03 Feb 2009 08:49:28 GMTIncorrect mouse movement in a Linux virtual machine can be fixed in two ways: switch from the VNC console to an SDL console, although SDL in virt-manager…https://www.ezylinux.com/en/regenerate-a-grub-devicemap-file/https://www.ezylinux.com/en/regenerate-a-grub-devicemap-file/Tue, 03 Feb 2009 07:26:54 GMTdevice.map maps hard disk devices to GRUB device names and is created during operating system installation. Recreate it if it is missing.https://www.ezylinux.com/en/configure-vlan-devices-over-a-bond-interface/https://www.ezylinux.com/en/configure-vlan-devices-over-a-bond-interface/Sun, 28 Dec 2008 14:58:54 GMTLinux supports VLAN networking through the 8021q driver. This example combines channel bonding and VLAN configuration.https://www.ezylinux.com/en/bridge-multiple-network-interfaces-to-guest-os/https://www.ezylinux.com/en/bridge-multiple-network-interfaces-to-guest-os/Sun, 21 Dec 2008 19:07:00 GMTCreate /etc/xen/scripts/network-xen-custom with #vi /etc/xen/scripts/network-xen-custom. Copy the script below into /etc/xen/scripts/network-xen-custom. #!/bin/sh # network…https://www.ezylinux.com/en/how-many-of-swap-space-for-linux-system/https://www.ezylinux.com/en/how-many-of-swap-space-for-linux-system/Sun, 21 Dec 2008 18:52:07 GMTMany people wonder how much swap to create during installation. The usual rule is at least twice the RAM, but if the system has a lot of RAM, is twice as much really necessary…https://www.ezylinux.com/en/add-fonts-thai-%E0%B9%83%E0%B8%99-linux-%E0%B8%81%E0%B8%B1%E0%B8%99/https://www.ezylinux.com/en/add-fonts-thai-%E0%B9%83%E0%B8%99-linux-%E0%B8%81%E0%B8%B1%E0%B8%99/Tue, 09 Dec 2008 08:31:12 GMTSome Linux versions display Thai vowels in the wrong positions because they lack fonts that render Thai correctly. There are several ways to fix this…https://www.ezylinux.com/en/bluetooth-mouse-with-linux-logitech-v470/https://www.ezylinux.com/en/bluetooth-mouse-with-linux-logitech-v470/Thu, 13 Nov 2008 13:59:39 GMTI bought a Logitech v470 Bluetooth wireless mouse and expected it to work with Linux as a standard device, but encountered an unexpected scroll wheel problem.https://www.ezylinux.com/en/rebuild-the-kernel-complie-kernel-from-kernel-source/https://www.ezylinux.com/en/rebuild-the-kernel-complie-kernel-from-kernel-source/Mon, 27 Oct 2008 08:08:05 GMTCompiling a Linux kernel may sound difficult, but it takes only a few steps after preparing the compiler, libraries, and other development tools.https://www.ezylinux.com/en/how-to-read-hard-drive-device-files-name/https://www.ezylinux.com/en/how-to-read-hard-drive-device-files-name/Mon, 13 Oct 2008 10:15:15 GMTLinux stores device files in /dev/, with names depending on device type. This article explains how to identify hard drive names and their prefixes.https://www.ezylinux.com/en/how-to-add-a-new-hard-disk-to-linux-system/https://www.ezylinux.com/en/how-to-add-a-new-hard-disk-to-linux-system/Sat, 11 Oct 2008 13:48:38 GMTAdding a hard disk to Linux is simpler than some people think, though slightly harder than in Microsoft Windows. You need to understand partitioning, filesystems, and mounting.https://www.ezylinux.com/en/determine-x86-compatible-intel-system-is-multi-processor-multi-core-or-supports-hyperthreading/https://www.ezylinux.com/en/determine-x86-compatible-intel-system-is-multi-processor-multi-core-or-supports-hyperthreading/Fri, 10 Oct 2008 10:52:07 GMTMany people know Hyperthreading (HT), also called Symmetric Multi-Threading (SMT), a feature of Intel x86 CPUs found in older Pentium 4 and some Xeon processors…https://www.ezylinux.com/en/after-installation-machine-hangs-during-first-boot/https://www.ezylinux.com/en/after-installation-machine-hangs-during-first-boot/Sat, 04 Oct 2008 17:49:13 GMTA Red Hat Enterprise Linux installation may hang on first boot because of an Advanced Power Management (APM) issue. Try disabling APM with apm=off.https://www.ezylinux.com/en/red-hat-delivers-first-integrated-linux-based-high-performance-computing-platform/https://www.ezylinux.com/en/red-hat-delivers-first-integrated-linux-based-high-performance-computing-platform/Fri, 03 Oct 2008 05:44:36 GMTRed Hat recently officially released its High Performance Computing Platform, a large-scale cluster system, with support through Red Hat Network after announcing it last November.https://www.ezylinux.com/en/how-to-use-command-to-restart-or-shut-down-linux-system/https://www.ezylinux.com/en/how-to-use-command-to-restart-or-shut-down-linux-system/Thu, 02 Oct 2008 18:51:06 GMTCommands to shut down Linux: #shutdown -h now #init 0 #halt #poweroff. Commands to reboot: #reboot #init 6 #shutdown -r now.https://www.ezylinux.com/en/implement-and-configuration-highly-available-lvm-ha-lvm/https://www.ezylinux.com/en/implement-and-configuration-highly-available-lvm-ha-lvm/Thu, 02 Oct 2008 12:46:35 GMTRed Hat Enterprise Linux 4.5 and later have a feature for implementing highly available LVM without CLVM, which is part of GFS.https://www.ezylinux.com/en/export-a-directory-with-nfs-v4/https://www.ezylinux.com/en/export-a-directory-with-nfs-v4/Fri, 26 Sep 2008 16:47:53 GMTA major difference between NFS v4 and earlier versions is the ability to export a single directory in a way similar to an FTP or web server, such as exporting /shared.https://www.ezylinux.com/en/fedora-10-release-schedule-and-accepted-features/https://www.ezylinux.com/en/fedora-10-release-schedule-and-accepted-features/Thu, 25 Sep 2008 05:53:25 GMTAfter releasing Fedora 9 on May 13, Fedora scheduled the Fedora 10 final release for November–December, with November 25 as the planned date…https://www.ezylinux.com/en/lock-user-after-a-set-number-of-login-attempts-but-also-automatically-unlock-after-5-minutes/https://www.ezylinux.com/en/lock-user-after-a-set-number-of-login-attempts-but-also-automatically-unlock-after-5-minutes/Thu, 18 Sep 2008 09:53:22 GMTThis article explains how to lock a user after a set number of login attempts using the pam_tally module in PAM.https://www.ezylinux.com/en/how-to-compile-linux-kernel/https://www.ezylinux.com/en/how-to-compile-linux-kernel/Tue, 16 Sep 2008 11:32:48 GMTHow to compile Linux Kernelhttps://www.ezylinux.com/en/force-users-to-change-their-passwords-upon-the-first-login/https://www.ezylinux.com/en/force-users-to-change-their-passwords-upon-the-first-login/Fri, 05 Sep 2008 08:47:52 GMTLinux can force users to change their passwords at their next login by locking the account, expiring the password, and unlocking the account.https://www.ezylinux.com/en/test-the-connectivity-to-any-socket-on-my-server-from-a-client-on-the-same-network-using-netcat/https://www.ezylinux.com/en/test-the-connectivity-to-any-socket-on-my-server-from-a-client-on-the-same-network-using-netcat/Thu, 04 Sep 2008 08:41:22 GMTUse netcat to test a connection by opening a socket on the server and connecting from a client on the network.https://www.ezylinux.com/en/diskdump-report-error-messages-when-restart-the-diskdump-service/https://www.ezylinux.com/en/diskdump-report-error-messages-when-restart-the-diskdump-service/Mon, 11 Aug 2008 08:45:08 GMTAfter changing the diskdump configuration and restarting its service, errors may appear in /var/log/messages: diskdump: diskdumpctl: failed to add /dev/hdb! diskdump: ahttps://www.ezylinux.com/en/fix-the-following-error-lvm-error-vg-meta-data-inconsistent/https://www.ezylinux.com/en/fix-the-following-error-lvm-error-vg-meta-data-inconsistent/Mon, 11 Aug 2008 05:57:32 GMTResolve LVM error VG meta data inconsistent by booting into rescue mode, restoring VG metadata, rescanning devices and groups, and activating the volume group.https://www.ezylinux.com/en/use-ipv6-address-be-specified-with-scp-sftp-and-ssh/https://www.ezylinux.com/en/use-ipv6-address-be-specified-with-scp-sftp-and-ssh/Thu, 24 Jul 2008 16:49:28 GMTUse scp, sftp, and ssh with IPv6 addresses by enclosing the address in square brackets, as demonstrated with fe80::219:99ff:fe20:c251.https://www.ezylinux.com/en/suggested-io-scheduler-for-a-video-on-demand-vod-server-using-red-hat-enterprise-linux/https://www.ezylinux.com/en/suggested-io-scheduler-for-a-video-on-demand-vod-server-using-red-hat-enterprise-linux/Sun, 20 Jul 2008 04:37:51 GMTOn a VOD server, using the cfg scheduler can increase disk I/O latency when many connections arrive, leading to uneven video playback.https://www.ezylinux.com/en/decrease-the-time-for-rebuilding-the-raid-1-array/https://www.ezylinux.com/en/decrease-the-time-for-rebuilding-the-raid-1-array/Fri, 27 Jun 2008 14:07:38 GMTTo reduce RAID 1 rebuild time, use: # mdadm -C /dev/md0 -l1 -n2 /dev/sda1 /dev/sda2 --bitmap=internal. --bitmap (Write-intent bitmap) reduces synchronization time…https://www.ezylinux.com/en/re-shape-or-grow-a-raid-5-array/https://www.ezylinux.com/en/re-shape-or-grow-a-raid-5-array/Fri, 27 Jun 2008 12:09:15 GMTGrowing Linux software RAID is straightforward. This example adds /dev/sdd1 to a three-disk RAID 5 array at /dev/md0, then grows the array and filesystem.https://www.ezylinux.com/en/how-to-enable-xdmcp/https://www.ezylinux.com/en/how-to-enable-xdmcp/Fri, 20 Jun 2008 16:33:38 GMTThe XDMCP configuration file has moved from /etc/X11/gdm/gdm.conf to /etc/gdm/custom.conf. To enable XDMCP, edit the section under xdmcp.https://www.ezylinux.com/en/other-virtual-network-interfaces-go-down-when-bring-down-virtual-network-interfaces/https://www.ezylinux.com/en/other-virtual-network-interfaces-go-down-when-bring-down-virtual-network-interfaces/Fri, 20 Jun 2008 16:20:02 GMTWith multiple virtual network interfaces, bringing one interface down may also bring down others. This example uses eth0:0, eth0:1, eth0:2, and eth0:3.https://www.ezylinux.com/en/show-line-numbers-in-vivim-editor/https://www.ezylinux.com/en/show-line-numbers-in-vivim-editor/Wed, 18 Jun 2008 12:59:43 GMTSometimes you need to find a specific line in a file, such as one identified by an error log. vi/vim can easily display or hide line numbers.https://www.ezylinux.com/en/increase-the-maximum-file-descriptors-for-squid/https://www.ezylinux.com/en/increase-the-maximum-file-descriptors-for-squid/Fri, 13 Jun 2008 14:04:35 GMTIf Squid logs WARNING! Your cache is running out of filedescriptors in cache.log, it was compiled with a maximum of 1024 file descriptors.https://www.ezylinux.com/en/reduce-a-non-root-lvm/https://www.ezylinux.com/en/reduce-a-non-root-lvm/Wed, 04 Jun 2008 09:56:07 GMTThis example reduces a 10 GB LVM volume to 8 GB, assuming it is mounted at /data, by shrinking the filesystem before reducing the logical volume.https://www.ezylinux.com/en/view-the-commented-lines-of-text-in-a-config-file/https://www.ezylinux.com/en/view-the-commented-lines-of-text-in-a-config-file/Fri, 30 May 2008 11:46:34 GMTUse grep to display configuration lines that begin with particular characters. This helps inspect comments and review configuration settings.https://www.ezylinux.com/en/configure-the-shell-to-logout-automatically-after-a-period-of-idle-time/https://www.ezylinux.com/en/configure-the-shell-to-logout-automatically-after-a-period-of-idle-time/Fri, 30 May 2008 10:55:13 GMTOn systems with many users, users who leave without logging out waste system resources. This method addresses that and also improves security…https://www.ezylinux.com/en/access-a-usb-flash-drive-in-linux/https://www.ezylinux.com/en/access-a-usb-flash-drive-in-linux/Wed, 23 Apr 2008 19:52:32 GMTLinux normally mounts USB flash drives or thumb drives automatically when you plug them in. Sometimes it does not, which can frustrate new users…https://www.ezylinux.com/en/what-is-a-red-hat-enterprise-linux-installation-number-and-where-do-i-get-it/https://www.ezylinux.com/en/what-is-a-red-hat-enterprise-linux-installation-number-and-where-do-i-get-it/Wed, 23 Apr 2008 19:18:48 GMTResolution: The Red Hat Enterprise Linux 5 Installation Number is a 16-character hexadecimal text string used during the installation process. The installation number enables a user to install the fulhttps://www.ezylinux.com/en/disable-some-cpus-within-red-hat-enterprise-linux-5-without-rebooting-the-system/https://www.ezylinux.com/en/disable-some-cpus-within-red-hat-enterprise-linux-5-without-rebooting-the-system/Wed, 23 Apr 2008 19:13:04 GMTWarning: check that your hardware supports CPU hot swapping before trying these commands; otherwise the hardware may be damaged.https://www.ezylinux.com/en/resize-multiple-image-files-using-command-line-tools/https://www.ezylinux.com/en/resize-multiple-image-files-using-command-line-tools/Thu, 10 Apr 2008 09:21:09 GMTThis article may be useful to webmasters. It covers Linux commands for resizing JPEG, TIFF, PNM, GIF, and other Photo CD image formats. The procedure is straightforward…https://www.ezylinux.com/en/ubuntu-linux-distribution/https://www.ezylinux.com/en/ubuntu-linux-distribution/Sat, 22 Mar 2008 08:10:53 GMTFrom Wikipedia, the free encyclopedia Ubuntu (IPA: [ ubuntu] in English,[2] IPA: [ùbúntú] in Zulu) is a Linux distribution for desktops, laptops, and servers. It is based on Debian GNU/Linux. Ubuntu ahttps://www.ezylinux.com/en/copy-a-list-of-print-queues-from-one-server-to-another/https://www.ezylinux.com/en/copy-a-list-of-print-queues-from-one-server-to-another/Sun, 09 Mar 2008 18:24:20 GMTOn Red Hat Linux clones, print queue settings can be exported and copied to another print server for use or load sharing.https://www.ezylinux.com/en/configure-vsftpd-uses-ldap-for-authentication/https://www.ezylinux.com/en/configure-vsftpd-uses-ldap-for-authentication/Sun, 09 Mar 2008 18:08:07 GMTvsftpd is a well-known FTP server included with many Linux distributions because it is stable, fast, and secure. It is widely used as an FTP server. Normally, vsftpd supports…https://www.ezylinux.com/en/redhat5-%E0%B9%81%E0%B8%A5%E0%B8%B0-redhat51-%E0%B9%80%E0%B8%81%E0%B8%B4%E0%B8%94%E0%B8%AD%E0%B8%B2%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%81%E0%B8%AE%E0%B8%87%E0%B8%84%E0%B9%8C%E0%B9%83%E0%B8%99%E0%B8%82/https://www.ezylinux.com/en/redhat5-%E0%B9%81%E0%B8%A5%E0%B8%B0-redhat51-%E0%B9%80%E0%B8%81%E0%B8%B4%E0%B8%94%E0%B8%AD%E0%B8%B2%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%81%E0%B8%AE%E0%B8%87%E0%B8%84%E0%B9%8C%E0%B9%83%E0%B8%99%E0%B8%82/Thu, 06 Mar 2008 16:51:12 GMTRedHat 5 and RedHat 5.1 may hang at the final stage of reboot or shutdown because of a cpufreq bug that causes a deadlock when its module is unloaded.https://www.ezylinux.com/en/make-bridge-multiple-network-interfaces-on-xen-host-to-guests-os/https://www.ezylinux.com/en/make-bridge-multiple-network-interfaces-on-xen-host-to-guests-os/Thu, 06 Mar 2008 13:41:37 GMTFirst create a script file using # vi /etc/xen/scripts/network-xen-custom. Then copy the following text into it: #!/bin/sh # network-xen-custom # Exit if anything goes wrong set -e # Fhttps://www.ezylinux.com/en/install-fully-virtualized-windows-2003-as-a-guest-os-on-xen/https://www.ezylinux.com/en/install-fully-virtualized-windows-2003-as-a-guest-os-on-xen/Wed, 05 Mar 2008 17:41:49 GMTInstalling Windows on Xen under Linux is more involved than with other virtualization systems, because you must check whether the CPU supports operating systems other than Linux through full virtualization…https://www.ezylinux.com/en/fully-virtualized-redhat-5-xen-guest-unstable/https://www.ezylinux.com/en/fully-virtualized-redhat-5-xen-guest-unstable/Wed, 05 Mar 2008 16:35:16 GMTA fully virtualized Linux guest may frequently hang or use excessive CPU after installation on a virtualization system.https://www.ezylinux.com/en/bug-red-hat-enterprise-linux-45-system-panic-when-i-boot-into-the-largesmp-kernel/https://www.ezylinux.com/en/bug-red-hat-enterprise-linux-45-system-panic-when-i-boot-into-the-largesmp-kernel/Wed, 05 Mar 2008 12:04:57 GMTOn RedHat V4.5, the largesmp kernel panics during boot on systems with more than eight CPUs and NUMA disabled. RedHat says the bug will be fixed in the next update.https://www.ezylinux.com/en/what-are-the-memory-and-cpu-limits-of-the-largesmp-kernel-in-red-hat-enterprise-linux-4/https://www.ezylinux.com/en/what-are-the-memory-and-cpu-limits-of-the-largesmp-kernel-in-red-hat-enterprise-linux-4/Wed, 05 Mar 2008 10:38:18 GMTRed Hat Enterprise Linux 4 update 3 and later provides a largesmp kernel for systems with many CPUs, available for x86_64, ia64, and ppc64.https://www.ezylinux.com/en/non-uniform-memory-access/https://www.ezylinux.com/en/non-uniform-memory-access/Wed, 05 Mar 2008 09:46:58 GMTNon-Uniform Memory Access or Non-Uniform Memory Architecture (NUMA) is a computer memory design used in multiprocessors, where the memory access time depends on the memory location relative to a procehttps://www.ezylinux.com/en/install-rhel-5/https://www.ezylinux.com/en/install-rhel-5/Sun, 20 Jan 2008 17:00:00 GMTLinux can be installed in several ways, including CD-ROM, hard disk, network, and Red Hat Network. This article focuses on installation from CD-ROM.https://www.ezylinux.com/en/linux/https://www.ezylinux.com/en/linux/Tue, 08 Jan 2008 13:12:11 GMTLinux (commonly pronounced IPA: /ˈlɪnəks/ in English; variants exist) is a Unix-like computer operating system. Linux is one of the most prominent examples of free software and open source developmenthttps://www.ezylinux.com/en/how-do-i-turn-off-the-bellbeep/https://www.ezylinux.com/en/how-do-i-turn-off-the-bellbeep/Sat, 15 Dec 2007 15:37:00 GMTIn Linux, you can disable the beep if you do not want it. The sound comes from the pcspkr module. Use: # rmmod pcspkr. To disable it every time the machine starts…https://www.ezylinux.com/en/extract-files-from-an-rpm-package/https://www.ezylinux.com/en/extract-files-from-an-rpm-package/Sat, 13 Oct 2007 14:12:00 GMTRPM (Red Hat Package Management) packages are installation files for Red Hat Linux distributions. They are popular because software is easy to install and remove.https://www.ezylinux.com/en/send-ctr-alt-del-to-the-guest-os-not-dom0/https://www.ezylinux.com/en/send-ctr-alt-del-to-the-guest-os-not-dom0/Wed, 10 Oct 2007 17:46:00 GMTIn a guest console, Ctrl + Alt + Del is received by dom0. In RHEL virt-manager, press Ctrl three times, then Alt + Del to send the combination to the guest.https://www.ezylinux.com/en/determined-systems-cpus-can-run-a-fully-virtualized-guest/https://www.ezylinux.com/en/determined-systems-cpus-can-run-a-fully-virtualized-guest/Wed, 10 Oct 2007 17:39:00 GMTTo run Xen in fully virtualized mode on Linux, the CPU must support virtualization technology. Check whether your CPU can run in fully virtualized mode…https://www.ezylinux.com/en/make-a-clone-of-a-virtual-guest-operating-system-in-rhel-5/https://www.ezylinux.com/en/make-a-clone-of-a-virtual-guest-operating-system-in-rhel-5/Wed, 10 Oct 2007 15:37:00 GMTXen in Red Hat 5 does not include guest OS cloning, but guests can be cloned with dd or LVM snapshots. This article covers the snapshot method.https://www.ezylinux.com/en/find-the-number-of-sockets-a-process-currently-has-open/https://www.ezylinux.com/en/find-the-number-of-sockets-a-process-currently-has-open/Fri, 28 Sep 2007 04:31:00 GMTTo find how many sockets a process has open on Linux, first identify its PID using $ ps -aef | grep, then count its sockets.https://www.ezylinux.com/en/create-filesystems-greater-than-2-terabytes/https://www.ezylinux.com/en/create-filesystems-greater-than-2-terabytes/Thu, 27 Sep 2007 16:52:00 GMTCentOS/RHEL 5 supports filesystems up to 8 TB, with 16 TB planned for the future. In practice, filesystem creation may stop at 2 TB; this article gives a workaround.https://www.ezylinux.com/en/map-of-the-linux-file-system/https://www.ezylinux.com/en/map-of-the-linux-file-system/Tue, 25 Sep 2007 12:36:00 GMTHere is a diagram of Linux directories for Ubuntu beginners and users who are unsure where things are stored. Many thanks to Scott Gilbertson of Wired.https://www.ezylinux.com/en/view-extended-information-about-network-connections-using-netstat/https://www.ezylinux.com/en/view-extended-information-about-network-connections-using-netstat/Mon, 24 Sep 2007 10:28:00 GMTUse netstat to view network details with the command below. [root@example ~]# netstat -tuanpeeoT Active Internet connections (servers and established) Proto Recv-Q Send-Q Local…https://www.ezylinux.com/en/setup-ssh-to-disable-direct-root-login/https://www.ezylinux.com/en/setup-ssh-to-disable-direct-root-login/Tue, 11 Sep 2007 16:32:00 GMTTo prevent direct root login over SSH, edit #vi /etc/ssh/sshd_config and set PermitRootLogin to no: PermitRootLogin no. Then restart SSH.https://www.ezylinux.com/en/logout-the-user-from-ssh-after-15-minutes-of-inactivity/https://www.ezylinux.com/en/logout-the-user-from-ssh-after-15-minutes-of-inactivity/Tue, 11 Sep 2007 16:31:00 GMTFor SSH security, configure the system to log out users after 15 minutes of inactivity by editing sshd_config.https://www.ezylinux.com/en/use-snmp-and-mrtg-to-monitor-cpu-mem-and-disk-use-status/https://www.ezylinux.com/en/use-snmp-and-mrtg-to-monitor-cpu-mem-and-disk-use-status/Tue, 11 Sep 2007 03:22:00 GMTThe previous article on installing MRTG with IOSTAT adapted monitoring-tool commands for use with MRTG. This differs from the usual approach of using SNMP to send status information…https://www.ezylinux.com/en/check-boot-parameters-were-passed-to-the-kernel/https://www.ezylinux.com/en/check-boot-parameters-were-passed-to-the-kernel/Mon, 10 Sep 2007 18:53:00 GMTTo see the kernel's boot parameters, use # cat /proc/cmdline. ro root=LABEL=/ rhgb quiethttps://www.ezylinux.com/en/how-to-remove-lilo-grub-or-master-boot-record-from-system/https://www.ezylinux.com/en/how-to-remove-lilo-grub-or-master-boot-record-from-system/Mon, 10 Sep 2007 18:51:00 GMTA hard disk generally stores the system bootloader's binary code in the first 512 sectors, or 512 bytes. LILO or GRUB embeds itself in the master boot record…https://www.ezylinux.com/en/force-fsck-on-the-next-boot-sequence/https://www.ezylinux.com/en/force-fsck-on-the-next-boot-sequence/Mon, 10 Sep 2007 18:45:00 GMTTo have Linux check every partition's file system after a reboot, use these commands as root. Create /forcefsck in the root directory to force a check on the next boot…https://www.ezylinux.com/en/setup-mrtg-to-monitor-cpu-workload-memory-and-disk-use-status-with-iostat/https://www.ezylinux.com/en/setup-mrtg-to-monitor-cpu-workload-memory-and-disk-use-status-with-iostat/Mon, 10 Sep 2007 17:28:00 GMTThis MRTG setup adapts monitoring tools to display hardware status. Scripts are needed for each hardware metric; this article uses IOSTAT tools.https://www.ezylinux.com/en/change-the-behavior-of-the-copy-cp-command-overwrite-the-existing-file-without-prompt/https://www.ezylinux.com/en/change-the-behavior-of-the-copy-cp-command-overwrite-the-existing-file-without-prompt/Sun, 09 Sep 2007 03:09:00 GMTEdit $HOME/.bashrc, because Red Hat adds alias cp='cp -i'. Thus the -r option has no effect. Comment out alias cp='cp -i' with #, then log out and log back in…https://www.ezylinux.com/en/change-my-hostname-or-the-machine-name-in-red-hat-linux/https://www.ezylinux.com/en/change-my-hostname-or-the-machine-name-in-red-hat-linux/Sat, 08 Sep 2007 18:31:00 GMTThere are several ways to change a Red Hat or Red Hat clone hostname, including hostname without restarting the network service.https://www.ezylinux.com/en/telnet-as-the-root-user/https://www.ezylinux.com/en/telnet-as-the-root-user/Sat, 08 Sep 2007 18:14:00 GMTTelnet is usually disabled on Linux for security reasons. This article describes enabling direct root login through telnet.https://www.ezylinux.com/en/when-you-forgot-root-password/https://www.ezylinux.com/en/when-you-forgot-root-password/Fri, 07 Sep 2007 06:43:00 GMTWhat can you do when you cannot log in because your password is rejected? After reading this article, you will be able to resolve the situation easily. I will cover two bootloaders…https://www.ezylinux.com/en/mplayer-multimedia-player-for-linux/https://www.ezylinux.com/en/mplayer-multimedia-player-for-linux/Mon, 03 Sep 2007 17:51:00 GMTRecently, many people have asked about playing VCDs, DVDs, and multimedia files. I would like to introduce Mplayer, a good Linux program for watching movies and listening to music. Its supported formats…https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%83%E0%B8%8A%E0%B9%89-man-command/https://www.ezylinux.com/en/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%83%E0%B8%8A%E0%B9%89-man-command/Mon, 03 Sep 2007 17:02:00 GMTThe previous article covered whatis and --help. This article explains how to read command manuals with man and search related entries with man -k or apropos.https://www.ezylinux.com/en/make-dd-give-a-progress-report/https://www.ezylinux.com/en/make-dd-give-a-progress-report/Fri, 31 Aug 2007 17:34:00 GMTMany of you have probably used dd, but it does not show how far it has progressed. This article explains how to view dd's progress.https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-mysql-cluster/https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-mysql-cluster/Fri, 31 Aug 2007 14:15:00 GMTThis setup uses four machines: two storage nodes, mysql-ndb-1 and mysql-ndb-2; one API node, mysql-api-1; and one management node, mgmt.https://www.ezylinux.com/en/improve-disk-performance-for-red-hat-enterprise-linux-running-in-a-vmware-and-xen-environment/https://www.ezylinux.com/en/improve-disk-performance-for-red-hat-enterprise-linux-running-in-a-vmware-and-xen-environment/Fri, 31 Aug 2007 04:37:00 GMTIn virtualization environments such as VMware or Xen, the host handles disk access. Setting the guest I/O scheduler to noop lets the host optimize I/O requests.https://www.ezylinux.com/en/how-to-rescan-the-scsi-bus-to-add-or-remove-a-scsi-device-without-rebooting-the-computer/https://www.ezylinux.com/en/how-to-rescan-the-scsi-bus-to-add-or-remove-a-scsi-device-without-rebooting-the-computer/Thu, 30 Aug 2007 16:02:00 GMTLinux supports online SCSI rescans, allowing drives to be rescanned without restarting the system.https://www.ezylinux.com/en/gnulinux-distro-timeline/https://www.ezylinux.com/en/gnulinux-distro-timeline/Wed, 29 Aug 2007 15:30:00 GMTThere are many Linux distributions today, but how many people know which distributions gave rise to the others? Let's look at the origins of the Linux distribution we use…https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-device-mapper-multipathing-%E0%B8%9A%E0%B8%99-sannas/https://www.ezylinux.com/en/%E0%B8%95%E0%B8%B4%E0%B8%94%E0%B8%95%E0%B8%B1%E0%B9%89%E0%B8%87-device-mapper-multipathing-%E0%B8%9A%E0%B8%99-sannas/Tue, 28 Aug 2007 18:49:00 GMTThis is an older article brought up to date because some readers may not know what device-mapper multipathing is for. It provides multipathing for storage devices such as SAN or NAS…https://www.ezylinux.com/en/how-to-add-a-swap-partition-to-my-system/https://www.ezylinux.com/en/how-to-add-a-swap-partition-to-my-system/Tue, 28 Aug 2007 18:40:00 GMTTo add a new SWAP partition, you need an unused partition with its type set to Linux-SWAP. For example, suppose /dev/hdb3 is unused. Steps to create SWAP…https://www.ezylinux.com/en/transparent-proxy-in-squid-26/https://www.ezylinux.com/en/transparent-proxy-in-squid-26/Tue, 28 Aug 2007 15:44:00 GMTTransparent proxy configuration changed in Squid version 2.6 onward. It uses http_port 3128 transparent instead of the older configuration with many lines, as shown below…https://www.ezylinux.com/en/3d-desktop-sun-microsystems/https://www.ezylinux.com/en/3d-desktop-sun-microsystems/Fri, 24 Aug 2007 18:31:00 GMTSUN's 3D desktop requires relatively powerful hardware for both computation and graphics. It is designed for Windows, Linux, and UNIX operating systems…https://www.ezylinux.com/en/ms-cluster/https://www.ezylinux.com/en/ms-cluster/Fri, 24 Aug 2007 17:55:00 GMTMS Window 2000 Advance Edition supports only 2 nodes. MS Window 2003 Standard Edition supports 4 nodes, if I remember correctly. MS Window 2003 Enterprise Edition supports 8 nodes, if I remember correctly. Microsoft divides clusters into two types…https://www.ezylinux.com/en/linux-cluster-concept-fail-over-and-load-balancing-cluster/https://www.ezylinux.com/en/linux-cluster-concept-fail-over-and-load-balancing-cluster/Fri, 24 Aug 2007 17:54:00 GMTLinux Cluster style: 1. High Availability or Fail-Over Cluster. 2. Load balancing Cluster. 1. Linux Cluster: High Availability (HA) or Fail-Over Cluster handles failover when a server goes down.https://www.ezylinux.com/en/linux-history/https://www.ezylinux.com/en/linux-history/Fri, 24 Aug 2007 17:26:00 GMTLinux's origins are closely related to UNIX, developed at Bell Labs in 1969 by Ken Thompson and Dennis Ritchie for use within AT&T.https://www.ezylinux.com/en/%E0%B8%82%E0%B8%AD%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%8A%E0%B9%88%E0%B8%A7%E0%B8%A2%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2%E0%B8%84%E0%B8%A3%E0%B9%8A%E0%B8%B2%E0%B8%9A%E0%B8%9A/https://www.ezylinux.com/en/%E0%B8%82%E0%B8%AD%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%8A%E0%B9%88%E0%B8%A7%E0%B8%A2%E0%B8%94%E0%B9%89%E0%B8%A7%E0%B8%A2%E0%B8%84%E0%B8%A3%E0%B9%8A%E0%B8%B2%E0%B8%9A%E0%B8%9A/Fri, 15 Jun 2007 09:38:57 GMTSome people may think help tools are unimportant, but I find them essential when I do not know what a command does, how to use it, or which parameters a file accepts.