Create filesystems greater than 2 Terabytes
CentOS/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.
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389 notes on Linux, tools and troubleshooting
Map Of The Linux File System
Here 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.
View extended information about network connections using netstat?
Use 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…
Setup SSH to disable direct root login.
To prevent direct root login over SSH, edit #vi /etc/ssh/sshd_config and set PermitRootLogin to no: PermitRootLogin no. Then restart SSH.
Logout the user from ssh after 15 minutes of inactivity
For SSH security, configure the system to log out users after 15 minutes of inactivity by editing sshd_config.
Use SNMP and MRTG to monitor CPU, MEM and Disk use status
The 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…
Check boot parameters were passed to the kernel
To see the kernel's boot parameters, use # cat /proc/cmdline. ro root=LABEL=/ rhgb quiet
How to Remove LILO, GRUB or Master Boot Record from system
A 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…
Force fsck on the next boot sequence
To 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…