Realtime LVM filesystem resize

Sometimes you need to resize your partition of your VPS system when you for example requested additional diskspace. In the below tutorial I resized my VPS hard-disk. Keep in mind that having a LVM file system is required for this tutorial.

With the below commands you can checking your current partition table.

root@ahv-id-10973:~# parted
GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: Msft Virtual Disk (scsi)
Disk /dev/sda: 270GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 400GB 400GB primary boot, lvm
(parted)

Now we know our partitions let’s resize the partition from 300GB to 400GB

root@ahv-id-10973:~# parted
GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) resizepart 1
End? [300GB]? 400GB
(parted) quit
Information: You may need to update /etc/fstab.

With pvresize and lvextend we extend our partition to the new size.

root@ahv-id-10973:~# pvresize /dev/sda1
Physical volume "/dev/sda1" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
root@ahv-id-10973:~# lvextend -l +100%FREE /dev/mapper/ubuntu--vg-root
Size of logical volume ubuntu-vg/root changed from 277.49 GiB (71037 extents) to 370.62 GiB (94878 extents).
Logical volume root successfully resized.

Now resize our filesystem with resize2fs

root@ahv-id-10973:~# resize2fs /dev/mapper/ubuntu--vg-root
resize2fs 1.42.13 (17-May-2015)
Filesystem at /dev/mapper/ubuntu--vg-root is mounted on /; on-line resizing required
old_desc_blocks = 18, new_desc_blocks = 24
The filesystem on /dev/mapper/ubuntu--vg-root is now 97155072 (4k) blocks long.

And there we have new diskspace.

root@ahv-id-10973:~# df -kh
Filesystem Size Used Avail Use% Mounted on
udev 7.9G 0 7.9G 0% /dev
tmpfs 1.6G 8.6M 1.6G 1% /run
/dev/mapper/ubuntu--vg-root 365G 2.2G 348G 1% /
tmpfs 7.9G 0 7.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup
tmpfs 1.6G 0 1.6G 0% /run/user/0