Btrfs: Difference between revisions
imported>Vixea |
imported>Onny Add section on subvolume snapshots |
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'''btrfs''' is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features while also focusing on fault tolerance, repair and easy administration. | '''btrfs''' is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features while also focusing on fault tolerance, repair and easy administration. | ||
== | == Installation == | ||
{{note|The following example is for EFI enabled systems. Adjust commands accordingly for a BIOS installation.}} | {{note|The following example is for EFI enabled systems. Adjust commands accordingly for a BIOS installation.}} | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
== Compression == | == Configuration == | ||
=== Compression == = | |||
<code>nixos-generate-config --show-hardware-config</code> doesn't detect mount options automatically, so to enable compression, you must specify it and other mount options in a persistent configuration: | <code>nixos-generate-config --show-hardware-config</code> doesn't detect mount options automatically, so to enable compression, you must specify it and other mount options in a persistent configuration: | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
== Swap file == | === Swap file === | ||
Optionally, create a separate subvolume for the swap file. Be sure to regenerate your <code>hardware-configuration.nix</code> if you choose to do this. | Optionally, create a separate subvolume for the swap file. Be sure to regenerate your <code>hardware-configuration.nix</code> if you choose to do this. | ||
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<syntaxhighlight lang="nix"> | <syntaxhighlight lang="nix"> | ||
swapDevices = [ { device = "/swap/swapfile"; } ]; | swapDevices = [ { device = "/swap/swapfile"; } ]; | ||
</syntaxhighlight> | |||
== Usage == | |||
=== Snapshots ==== | |||
Taking a read-only (<code>-r</code>) snapshot called <code>nixos_snapshot_202302</code> of the subvolume mounted at <code>/</code> | |||
<syntaxhighlight lang="bash"> | |||
btrfs subvolume snapshot -r / /mnt/@nixos_snapshot_202302 | |||
</syntaxhighlight> | |||
List snapshots for <code>/</code> | |||
<syntaxhighlight lang="bash"> | |||
sudo btrfs subvolume list / | |||
</syntaxhighlight> | </syntaxhighlight> | ||
[[Category: Configuration]] | [[Category: Configuration]] | ||