Extend LVM space to the rest of the free space on the disk

Recently, we formatted a server with Ubuntu 22.04 LTS. While selecting the disk settings, we selected the encrypted LVM partition scheme, and even though we selected the whole disk, we did not notice that the LVM would only allocate, by default, 100GB out of the 600GB available on the raid volume.

So, we proceeded with the installation, and at some point, we noticed that we ran out of space which should not have happened.

Using the command df -h we quickly spotted the problem:

$ df -h
Filesystem                 Size  Used Avail Use% Mounted on
tmpfs                      3,2G  3,9M  3,2G   1% /run
/dev/mapper/vgubuntu-root  100G   83G   17G  83% /
tmpfs                       16G   40M   16G   1% /dev/shm
tmpfs                      5,0M  4,0K  5,0M   1% /run/lock
/dev/sda5                  703M  257M  395M  40% /boot
/dev/sda1                  511M   24K  511M   1% /boot/efi
tmpfs                       16G     0   16G   0% /run/qemu
tmpfs                      3,2G  156K  3,2G   1% /run/user/1000

/dev/mapper/vgubuntu-root was only 100GB instead of the 600GB that we would expect it to be.

Using the command vgdisplay we verified that the space allocated to the logical volume group was not what we wanted.

To fix the problem, we issued the following commands:

lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv;
resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv;

lvextend instructed our logical volume to consume all the available space on the hosting disk.

Then resize2fs allocated all the available space to our partition.