How to resize ZFS used in LXD

LXD
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So I just went through this and was getting some of the errors listed above and thought I’d leave what worked for me in case someone else out there has similar problems.

Assumptions: 1) One zfs pool called ‘default’ that lives on the hard drive at /var/lib/lxd/disks/default.img. 2) Running as root. 3) Growing pool ‘default’ from 25GB to 45GB.

  1. Stop all running containers.
  2. #truncate -s +20G /var/lib/lxd/disks/default.img
  3. #zpool set autoexpand=on default
  4. #zpool status -vg default
    4a. Note the device id value from the results (for me, it was a really long number). You’ll need it in the next step.
  5. #zpool online -e default device_id_from_step_4a
  6. #zpool set autoexpand=off default
  7. #service lxd restart
    7a. This is on Debian/Ubuntu. For CentOS, it’d be a “systemctl” command.

After service restart, if you do a “$lxc storage info default”, you should now see the expanded space. Restart containers.

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