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Vince van Oosten 596cfb6b15 include systemd overrides to zfs-dracut module 
If a user that uses systemd and dracut wants to overide certain
settings, they typically use `systemctl edit [unit]` or place a file in
`/etc/systemd/system/[unit].d/override.conf` directly.

The zfs-dracut module did not include those overrides however, so this
did not have any effect at boot time.

For zfs-import-scan.service and zfs-import-cache.service, overrides are
now included in the dracut initramfs image.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Vince van Oosten <techhazard@codeforyouand.me>
Closes #14075
Closes #14076
 		2023-01-19 12:50:42 -08:00
..
02zfsexpandknowledge dracut: skip zfsexpandknoweldge when zfs_devs is present in dracut 2022-12-09 10:42:46 -08:00
90zfs include systemd overrides to zfs-dracut module 2023-01-19 12:50:42 -08:00
Makefile.am Turn shellcheck into a normal make target. Fix new files it caught 2021-06-09 13:05:34 -07:00
README.dracut.markdown Add dracut.zfs.7 2022-05-06 12:01:48 -07:00

README.dracut.markdown

Basic setup

  1. Install zfs-dracut
  2. Set mountpoint=/ for your root dataset (for compatibility, legacy also works, but is not recommended for new installations): 
    zfs set mountpoint=/ pool/dataset
  3. Either (a) set bootfs= on the pool to the dataset: 
    zpool set bootfs=pool/dataset pool
  4. Or (b) append root=zfs:pool/dataset to your kernel cmdline.
  5. Re-generate your initrd and update it in your boot bundle

Encrypted datasets have keys loaded automatically or prompted for.

If the root dataset contains children with mountpoint=s of /etc, /bin, /lib*, or /usr, they're mounted too.

For complete documentation, see dracut.zfs(7).

cmdline

  1. root= Root dataset is…
    (empty) the first bootfs= after zpool import -aN
    zfs:AUTO, zfs:, zfs (as above, but overriding other autoselection methods)
    ZFS=pool/dataset pool/dataset
    zfs:pool/dataset (as above)

    All +es are replaced with spaces (i.e. to boot from root pool/data set, pass root=zfs:root+pool/data+set).

    The dataset can be at any depth, including being the pool's root dataset (i.e. root=zfs:pool).

    rootfstype=zfs is equivalent to root=zfs:AUTO, rootfstype=zfs root=pool/dataset is equivalent to root=zfs:pool/dataset.

  2. spl_hostid: passed to zgenhostid -f, useful to override the /etc/hostid file baked into the initrd.

  3. bootfs.snapshot, bootfs.snapshot=snapshot-name: enables zfs-snapshot-bootfs.service, which creates a snapshot $root_dataset@$(uname -r) (or, in the second form, $root_dataset@snapshot-name) after pool import but before the rootfs is mounted. Failure to create the snapshot is noted, but booting continues.

  4. bootfs.rollback, bootfs.rollback=snapshot-name: enables zfs-snapshot-bootfs.service, which -Rf rolls back to $root_dataset@$(uname -r) (or, in the second form, $root_dataset@snapshot-name) after pool import but before the rootfs is mounted. Failure to roll back will fall down to the rescue shell. This has obvious potential for data loss: make sure your persistent data is not below the rootfs and you don't care about any intermediate snapshots.

  5. If both bootfs.snapshot and bootfs.rollback are set, bootfs.rollback is ordered after bootfs.snapshot.

  6. zfs_force, zfs.force, zfsforce: add -f to all zpool import invocations. May be useful. Use with caution.