Extending Encrypted Logical Volumes

The process below shows how to extend the encrypted lvm root partition to a new attached disk

1. Attach the new disk to the existing encrypted system
2. Partition the disk with your preferred partitioning tool (e.g., fdisk, parted, or gparted). 

NOTE: You can skip to step 3 if you are just using the entire disk as PV.

Example:

parted /dev/sdb

mklabel --> set to gpt

mkpart  --> create primary partition

exit parted tool

               Create physical volume (PV) on the newly created partition with pvcreate command.

Example:

pvcreate /dev/sdb1

1. Extend the volume group (VG). Use command "vgextend <vg_name> /dev/sdX1"

Example:

vgextend vg0 /dev/sdb1

1. Extend the logical volume. Use command "lvextend -L +<size> <lv_path>"

Example:

lvextend -L +2G /dev/vg0/lv-0

or

lvextend -l +100%FREE /dev/vg0/lv-0

1. When you run lsblk command, you will notice the lvm size increase but the encrypted partition size remains the same

1. Reboot client machine
2. After reboot, run the lsblk command again and you should notice the encrypted partition size should now be increased as well

1. Resize the file system so it uses the additional space

Example:

Resize2fs /dev/mapper/encr_0

1. You can confirm that the filesystem has been extended as well by running the df command (/dev/mapper/encr_0 should show the correct size now)