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I use ZFS to store my data, including configuration files, for my desktop PC, so it's important for my datasets to mount automatically on boot. I couldn't for the life of me figure out how to do this in Ubuntu 19.10.

At first, when I ran zfs list and zpool list, there was no output; it was empty. Then, after figuring out how to import my pools, they still wouldn't mount.

Leonora Tindall
  • 353

3 Answers3

4

The correct way to do this is to make sure three unit files are enabled to start on boot:

  • zfs.target, which is the overarching target for all of ZFS
  • zfs-import.service, which imports zpools at boot
  • zfs-mount.service, which mounts all datasets at boot

These units have dependencies set up correctly, so you can simply run:

systemctl enable zfs.target zfs-import.service zfs-mount.service

to ensure they are all turned on. After this, reboot to test; your ZFS datasets should show up.

Leonora Tindall
  • 353
1

I have found that zfs-zed.service which updates zpool cache and zfs-list cache to no longer be running after a systemctl suspend and require manual restart, if I forget that the caches don't get updated for any later changes for next reboot. I'll improve this with details shortly to replicate and try a clean install on the weekend and or move this to the to the proper place. Openzfs 2.1.5 with compatibility set to openzfs-2.1-linux. Ubuntu 22.04 and proxmox hacked with zsys sharing boot and root pools.

Michael Adams
  • 11
  • 1
1

Update for 22.04 LTS:

Instructions exist in the zfs-mount-generator(8) manual page, but I had to make a few changes. Here's what worked for me:

# enable tracking for the pool
mkdir /etc/zfs/zfs-list.cache
touch /etc/zfs/zfs-list.cache/main

enable the tracking ZEDLET


systemctl enable zfs-zed.service
systemctl restart zfs-zed.service


trigger cache refresh


zfs set relatime=off main/secure
zfs inherit relatime main/secure


re-run systemd generators and reboot


systemctl daemon-reload
reboot
Adam Monsen
  • 2,161