SSH

Description	Command
Create private/public SSH key file using 2048 bit encryption and with a comment. The command creates files under ~/.ssh folder.	`ssh-keygen -b 2048 -C user@host.domain`
Push public SSH key to a server	`ssh-copy-id -p 41111 -i ~/.ssh/id_rsa.pub mhan@remote.server.com`

Disk

Description	Command
Initialize for use as LVM physical volume.	`pvcreate /dev/sdb1`
Scanning for block devices.	`lvmdiskscan`
Display the physical volumes.	`pvdisplay`
Show all physical devices.	`pvscan`
Prevent allocation of physical extents on the free space of one or more physical volumes.	`pvchange -x n /dev/sdb1`
Resize.	`pvresize`
Remove LVM label.	`pvremove`

Description	Command
Create a volume group.	`vgcreate vg1 /dev/sdb1 /dev/sdc1`
Add a physical volume to a volume group.	`vgextend vg1 /dev/sdd1`
Display volume group.	`vgdisplay new_vg`
Scan disks for volume groups.	`vgscan`
Remove a physical volume from a volume group.	`vgreduce group_name /dev/sdc1`
Change the maximum number of logical volumes of volume group vg00 to 128.	`vgchange -l 128 /dev/vg00`
Activate or deactivate a volume group.	`vgchange -a n my_volume_group`
Remove a volume group.	`vgremove officevg`
Split the physical volumes of a volume group and create a new volume group.	`$ vgsplit bigvg smallvg /dev/ram15 Volume group "smallvg" successfully split from "bigvg"`
Merge the inactive volume group my_vg into the active or inactive volume group databases giving verbose runtime information.	`vgmerge -v databases my_vg`
Change the name of a volume group.	`vgrename vg02 my_volume_group`