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Workaround to avoid a race when /var/lib is a persistent dataset
If /var/lib is a dataset not under <pool>/ROOT/<root_dataset>, as proposed in the ubuntu root on zfs upstream guide (https://github.com/zfsonlinux/zfs/wiki/Ubuntu-18.04-Root-on-ZFS), we end up with a race where some services, like systemd-random-seed are writing under /var/lib, while zfs-mount is called. zfs mount will then potentially fail because of /var/lib isn't empty and so, can't be mounted. Order those 2 units for now (more may be needed) as we can't declare virtually a provide mount point to match "RequiresMountsFor=/var/lib/systemd/random-seed" from systemd-random-seed.service. The optional generator for zfs 0.8 fixes it, but it's not enabled by default nor necessarily required. Example: - rpool/ROOT/ubuntu (mountpoint = /) - rpool/var/ (mountpoint = /var) - rpool/var/lib (mountpoint = /var/lib) Both zfs-mount.service and systemd-random-seed.service are starting After=systemd-remount-fs.service. zfs-mount.service should be done before local-fs.target while systemd-random-seed.service should finish before sysinit.target (which is a later target). Ideally, we would have a way for zfs mount -a unit to declare all paths or move systemd-random-seed after local-fs.target. Reviewed-by: Antonio Russo <email@example.com> Reviewed-by: Richard Laager <firstname.lastname@example.org> Reviewed-by: Brian Behlendorf <email@example.com> Signed-off-by: Didier Roche <firstname.lastname@example.org> Closes #9360
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