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Title: Unset ZFS legacy mountpoints Date: 2022-12-12 23:38 Summary: Unset ZFS legacy mountpoints on an OVH baremetal server installed with Proxmox and ZFS Category: Bloc-notes Tags: zfs, proxmox, ovh, admin, shell, cli, storage, backup Status: Published Translation: true Lang: en Slug: unset-zfs-legacy-mountpoint-proxmox-ovh-installation

Proxmox with a ZFS root file system on an OVHcloud baremetal server use Legacy mountpoints (managed via /etc/fstab). This is a valid setup but avoid using properties inheritance between datasets. Let’s get gives back to ZFS the mountpoint management with a few configuration.

initial situation on proxmox after installation:

root@server:~# zfs list
NAME      USED  AVAIL     REFER  MOUNTPOINT
zp0      3.29G  1.75T       96K  none
zp0/zd0  91.8M   932M     91.8M  legacy
zp0/zd1  3.20G  1.75T     3.20G  legacy
zp0/zd2   104K  1024M      104K  legacy

root@server:~# grep zp0 /etc/fstab
zp0/zd1	/			zfs	defaults										0	1
zp0/zd0	/boot		zfs	defaults,x-systemd.requires=zfs-import.target	0	0
zp0/zd2	/var/lib/vz	zfs	defaults,x-systemd.requires=zfs-import.target	0	0

reboot to customer rescue to set mountpoints…

root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # modprobe zfs
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # zpool import -f -N -R /mnt zp0
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # zfs set mountpoint=/ zp0/zd1
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # zfs set mountpoint=/boot zp0/zd0
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # zfs set mountpoint=/var/lib/vz zp0/zd2
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # zfs get -r mounted zp0
NAME     PROPERTY  VALUE    SOURCE
zp0      mounted   no       -
zp0/zd0  mounted   yes      -
zp0/zd1  mounted   yes      -
zp0/zd2  mounted   yes      -

root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # grep zp0 /mnt/etc/fstab
zp0/zd1	/			zfs	defaults										0	1
zp0/zd0	/boot		zfs	defaults,x-systemd.requires=zfs-import.target	0	0
zp0/zd2	/var/lib/vz	zfs	defaults,x-systemd.requires=zfs-import.target	0	0

root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # sed -i '/^zp0/d' /mnt/etc/fstab
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # grep zp0 /mnt/etc/fstab
root@rescue-customer-eu (nsxxxxx.ip-x-x-x.eu) ~ # zpool export -a

reboot to proxmox, et voilà!

root@server:~# zfs list -r
NAME      USED  AVAIL     REFER  MOUNTPOINT
zp0      3.29G  1.75T       96K  none
zp0/zd0  91.8M   932M     91.8M  /boot
zp0/zd1  3.20G  1.75T     3.20G  /
zp0/zd2   104K  1024M      104K  /var/lib/vz

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