Proxmox Tips

Grow LUKS crypt partition.

TIP

This can be done even if the disk is active! No need to restart guest VM.

@ref: https://unix.stackexchange.com/questions/320957/extend-a-luks-encrypted-partition-to-fill-disk

# cryptsetup status /dev/mapper/dm_crypt-0
/dev/mapper/dm_crypt-0 is active and is in use.
  type:    LUKS2
  cipher:  aes-xts-plain64
  keysize: 512 bits
  key location: keyring
  device:  /dev/sda3
  sector size:  512
  offset:  32768 sectors
  size:    128833536 sectors
  mode:    read/write

Extend lvs

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

Tell cryptsetup to update

cryptsetup resize /dev/mapper/dm_crypt-0

Use parted to resize

# parted
(parted) resizepart 3
End?  [206GB]? <enter 100%> here

pvresize

# pvresize /dev/mapper/dm_crypt-0
Physical volume "/dev/mapper/dm_crypt-0" changed
1 physical volume(s) resized or updated / 0 physical volume(s) not resized

vgs should show updated size

# vgs
  VG        #PV #LV #SN Attr   VSize    VFree
  ubuntu-vg   1   1   0 wz--n- <189.43g 128.00g

resize lvm

# lvresize -l+100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
  Size of logical volume ubuntu-vg/ubuntu-lv changed from <61.43 GiB (15726 extents) to <189.43 GiB (48494 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

check lvs

# lvs
  LV        VG        Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  ubuntu-lv ubuntu-vg -wi-ao---- <189.43g

resize

# resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required
old_desc_blocks = 8, new_desc_blocks = 24
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 49657856 (4k) blocks long.

done!

# df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               7.8G     0  7.8G   0% /dev
tmpfs                              1.6G  5.7M  1.6G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  187G   48G  131G  27% /
...