Some advanced commands for Linux administration
I will update this page as I come across more interesting and less-known commands for Linux Administration, for reference.
Resource Management
View the CPU load of a specific process only
top -p $(pgrep -d, appserver)
Limit the CPU usage of a process to 25%
cpulimit -e backup.sh -l 25
Migrate a running process to a different CPU core without restarting it
taskset -p 2 <PID>
Bind a process to specific CPU cores
taskset -c 0,2 <app>
Check which NUMA (Non-Uniform Memory Access) nodes a process is using
cat /proc/<PID>/numa_maps
Show processes actively using I/O and their real-time disk I/O usage
iotop -o
Storage Management
Unlock and mount a LUKS-encrypted partition
cryptsetup luksOpen /dev/sdb1 secure_data && mount /dev/mapper/secure_data /mnt/secure
Unmount and close/re-lock a LUKS-encrypted partition
umount /mnt/secure && cryptsetup luksClose secure_data
Create a RAID 5 array using 3x specified disks
mdadm --create --level=5 --raid-devices=3 /dev/md0 /dev/sdb /dev/sdc /dev/sdd
Networking
Set up a static route so that all traffic to a specific IP goes through a specific network interface
ip route add 192.168.2.0/24 dev eth1
Execute a self-test on a NIC
ethtool -t eth0