How to disable visual mode on mouse select for vim
If 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…
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How to add disclaimer per domain on ZIMBRA 8.0
If 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 glob
How to stress test the memory on linux
stress 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.
Ansible Tutorial - Directory layout and Example
Ansible is agentless configuration management using SSH. This tutorial explains directory layout for organizing YAML tasks for easier editing and reuse.
PackStack gets "Failed to load plugin from file prescript_000.py" error
When 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.py
How to fix memory leak from big nfs_inode_cache
A 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.
Blacklist and Whitelist with Amavisd
Configure 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…
How to block external email from domains or individual email
To 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.
How to change the recipient of the "daily report"
By default, ZIMBRA emails the system daily report to [email protected]. To send the daily report to a different email address, use the following procedure.