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Makefile.am
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README.initramfs.markdown
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conf-hooks.d
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conf.d
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hooks
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scripts
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zfsunlock
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Editing: README.initramfs.markdown
## Description These scripts are intended to be used with `initramfs-tools`, which is a similar software product to `dracut` (which is used in Red Hat based distributions), and is mainly used by Debian GNU/Linux and derivatives. These scripts share some common functionality with the SysV init scripts, primarily the `/etc/zfs/zfs-functions` script. ## Configuration ### Root pool/filesystem Different distributions have their own standard on what to specify on the kernel command line to boot off a ZFS filesystem. This script supports the following kernel command line argument combinations (in this order - first match wins): * `rpool=<pool>` * `bootfs=<pool>/<dataset>` * `rpool=<pool> bootfs=<pool>/<dataset>` * `-B zfs-bootfs=<pool>/<fs>` * `root=<pool>/<dataset>` * `root=ZFS=<pool>/<dataset>` * `root=zfs:AUTO` * `root=zfs:<pool>/<dataset>` * `rpool=rpool` If a pool is specified, it will be used. Otherwise, in `AUTO` mode, all pools will be searched. Pools may be excluded from the search by listing them in `ZFS_POOL_EXCEPTIONS` in `/etc/default/zfs`. Pools will be imported as follows: * Try `/dev/disk/by-vdev` if it exists; see `/etc/zfs/vdev_id.conf`. * Try `/dev/disk/by-id` and any other `/dev/disk/by-*` directories. * Try `/dev`. * Use the cache file if nothing else worked. This order may be modified by setting `ZPOOL_IMPORT_PATH` in `/etc/default/zfs`. If a dataset is specified, it will be used as the root filesystem. Otherwise, this script will attempt to find a root filesystem automatically (in the specified pool or all pools, as described above). Filesystems below the root filesystem will be automatically mounted with no additional configuration necessary. For example, if the root filesystem is `rpool/ROOT/rootfs`, `rpool/root/rootfs/var`, `rpool/root/rootfs/usr`, etc. will be mounted (if they exist). ### Snapshots The `<dataset>` can be a snapshot. In this case, the snapshot will be cloned and the clone used as the root filesystem. Note: * If the snapshot does not exist, the base dataset (the part before `@`) is used as the boot filesystem instead. * If the resulting clone dataset already exists, it is destroyed. * The clone is created with `mountpoint=none` and `canmount=noauto`. The root filesystem is mounted manually by the initramfs script. * If no snapshot is specified on the `root=` kernel command line, but there is an `@`, the user will be prompted to choose a snapshot to use. ### Extra options The following kernel command line arguments are supported: * `zfsdebug=(on,yes,1)`: Show extra debugging information * `zfsforce=(on,yes,1)`: Force import the pool * `rollback=(on,yes,1)`: Rollback to (instead of clone) the snapshot ### Unlocking a ZFS encrypted root over SSH To use this feature: 1. Install the `dropbear-initramfs` package. You may wish to uninstall the `cryptsetup-initramfs` package to avoid warnings. 2. Add your SSH key(s) to `/etc/dropbear-initramfs/authorized_keys`. Note that Dropbear does not support ed25519 keys; use RSA (2048-bit or more) instead. 3. Rebuild the initramfs with your keys: `update-initramfs -u` 4. During the system boot, login via SSH and run: `zfsunlock`
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