Knowledgebase

Connect to the server using SSH.

Make sure that the server uses LVM:

• The similar output will be returned if LVM is present:

  # lvs
  LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
  root centos -wi-ao---- <8.00g
  swap centos -wi-ao---- 1.00g

  Note: centos here is the name of the logical group. It will be used in the further steps

• The similar output will be returned if LVM is not present:

  # lvs
  -bash: lvs: command not found

  # lvdisplay -v
  No volume groups found.

  Warning: In this case, solution from the article cannot be applied, as the server does not use LVM.

Start cfdisk to get information about current partition schema:

# cfdisk

Note: Unallocated disk space will have Free Space FS Type. This space can be used for creation of a partition and for further LVM extension

Select unallocated disk space using arrow buttons and create a new partition by clicking on the [ New ] button:

Follow the wizard to create a Primary partition and its size. Primary type is selected by default, and the default size corresponds to the free disk space size

Click on [ Write ] and then [ Quit ] to confirm create and apply changes to the hard drive partition table:

Note: The name of the new partition may vary, in this case it is sda3. It will be used in the further steps

Run partprobe to load partition changes in userspace:

# partprobe

Once new partition table is loaded, it is possible to add a new volume to the logical group using its name:

# vgextend centos /dev/sda3
Physical volume "/dev/sda3" successfully created
Volume group "centos" successfully extended

Note: Volume and logical group names may vary, in this case it is centos and sda3. Refer to step 6 and command cfdisk to get volume name and to step 2 and command vgdisplay to get volume group name

Then it is possible to extend logical volume of root directory to add all unused space available in the volume group:

# lvdisplay | grep 'LV Path'
LV Path /dev/centos/root
LV Path /dev/centos/swap

# ls -la /dev/centos/root
lrwxrwxrwx. 1 root root 7 Aug 28 21:14 /dev/centos/root -> ../dm-0

# lsblk /dev/dm-0
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
centos-root 253:0 0 23G 0 lvm /

Note: Since /dev/centos/root is mounted on the /, as displayed above, it should be resized. Logical volume name may vary

# lvresize -l +100%FREE /dev/centos/root

Extend the partition located on the logical volume:

Note: To determine file system, run file -sL /dev/centos/root

Check that the disk space has been extended:

# df -h