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| This is a userspace draft and is not supported by NixOS Wiki.
| | Moved to here: |
| | https://openzfs.github.io/openzfs-docs/Getting%20Started/NixOS/Root%20on%20ZFS.html |
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| == Enable ZFS on Existing Installation ==
| | Last version is: https://wiki.nixos.org/w/index.php?title=User:2r/NixOS_on_ZFS&oldid=5406 |
| Add the following lines to configuration:
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| <pre>boot.supportedFilesystems = [ "zfs" ];
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| networking.hostId = "deadbeef";</pre>
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| Host ID should be unique, generate one with <code>head -c 8 /etc/machine-id</code>.
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| | |
| Rebuild system with <code>nixos-rebuild switch</code>.
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| | |
| == Install NixOS on ZFS ==
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| === Layout ===
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| ==== Partitions ====
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| As swap on ZFS will cause deadlock and does not support hibernation, a separate swap partition should be created.
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| | |
| GRUB supports decrypting LUKS1 container and limited ZFS features, a separate, feature limited boot pool is created for compatibility.
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| {| class="wikitable"
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| |+ GPT partition table
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| |-
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| | ESP
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| | bpool
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| | rpool
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| | swap
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| | BIOS boot sector
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| |-
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| |width=5% valign=top| Filesystem
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| |width=20% valign=top| vfat
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| |width=20% valign=top| ZFS, feature limited for GRUB compatibility.
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| |width=20% valign=top| ZFS
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| |width=20% valign=top| swap
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| |width=5% valign=top| N/A
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| |-
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| |width=5% valign=top| Content
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| |width=20% valign=top| <code>grubx64.efi</code>
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| |width=20% valign=top| <code>/boot</code>
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| |width=20% valign=top| <code>/</code>
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| |width=20% valign=top| swap
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| |width=5% valign=top| N/A
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| |-
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| |width=5% valign=top| Encryption
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| |width=20% valign=top| No, can be validated with Secure Boot
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| |width=20% valign=top| LUKS1
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| |width=20% valign=top| ZFS Encrytion
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| |width=20% valign=top| random/LUKS2
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| |width=5% valign=top| N/A
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| |}
| |
| ==== Datasets ====
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| As NixOS lacks a service to handle native ZFS mounting at boot, such as <code>zfs-mount-generator</code>, all mountable datasets must be created with <code>mountpoint=legacy</code> to be mounted with <code>fileSystems</code> option.
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| | |
| Datasets with <code>canmount=off</code> are used as containers, that is, no data is stored directly under such datasets, but child datasets can inherit their properties or imitate directory structures, such as <code>/var/log</code>.
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| | |
| When creating pools, a default dataset with the same name as the pool name is also created.
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| {| class="wikitable"
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| |+ Dataset layout
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| |colspan="3"|<code>canmount=off</code>
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| |<code>canmount=noauto</code>
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| |-
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| | bpool
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| | sys
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| | BOOT
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| | default
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| |-
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| |rowspan="2"| rpool
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| |rowspan="2"| sys
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| | ROOT
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| | default
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| |-
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| | DATA
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| | default
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| |}
| |