mirror of
https://github.com/ilyakooo0/nixpkgs.git
synced 2024-12-29 14:57:28 +03:00
62 lines
1.9 KiB
XML
62 lines
1.9 KiB
XML
|
<chapter xmlns="http://docbook.org/ns/docbook"
|
|||
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
|||
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
|||
|
|
version="5.0"
|
|||
|
|
xml:id="sec-nix-gc">
|
|||
|
|
|
|||
|
|
<title>Cleaning the Nix Store</title>
|
|||
|
|
|
|||
|
|
<para>Nix has a purely functional model, meaning that packages are
|
|||
|
|
never upgraded in place. Instead new versions of packages end up in a
|
|||
|
|
different location in the Nix store (<filename>/nix/store</filename>).
|
|||
|
|
You should periodically run Nix’s <emphasis>garbage
|
|||
|
|
collector</emphasis> to remove old, unreferenced packages. This is
|
|||
|
|
easy:
|
|||
|
|
|
|||
|
|
<screen>
|
|||
|
|
$ nix-collect-garbage
|
|||
|
|
</screen>
|
|||
|
|
|
|||
|
|
Alternatively, you can use a systemd unit that does the same in the
|
|||
|
|
background:
|
|||
|
|
|
|||
|
|
<screen>
|
|||
|
|
$ systemctl start nix-gc.service
|
|||
|
|
</screen>
|
|||
|
|
|
|||
|
|
You can tell NixOS in <filename>configuration.nix</filename> to run
|
|||
|
|
this unit automatically at certain points in time, for instance, every
|
|||
|
|
night at 03:15:
|
|||
|
|
|
|||
|
|
<programlisting>
|
|||
|
|
nix.gc.automatic = true;
|
|||
|
|
nix.gc.dates = "03:15";
|
|||
|
|
</programlisting>
|
|||
|
|
|
|||
|
|
</para>
|
|||
|
|
|
|||
|
|
<para>The commands above do not remove garbage collector roots, such
|
|||
|
|
as old system configurations. Thus they do not remove the ability to
|
|||
|
|
roll back to previous configurations. The following command deletes
|
|||
|
|
old roots, removing the ability to roll back to them:
|
|||
|
|
<screen>
|
|||
|
|
$ nix-collect-garbage -d
|
|||
|
|
</screen>
|
|||
|
|
You can also do this for specific profiles, e.g.
|
|||
|
|
<screen>
|
|||
|
|
$ nix-env -p /nix/var/nix/profiles/per-user/eelco/profile --delete-generations old
|
|||
|
|
</screen>
|
|||
|
|
Note that NixOS system configurations are stored in the profile
|
|||
|
|
<filename>/nix/var/nix/profiles/system</filename>.</para>
|
|||
|
|
|
|||
|
|
<para>Another way to reclaim disk space (often as much as 40% of the
|
|||
|
|
size of the Nix store) is to run Nix’s store optimiser, which seeks
|
|||
|
|
out identical files in the store and replaces them with hard links to
|
|||
|
|
a single copy.
|
|||
|
|
<screen>
|
|||
|
|
$ nix-store --optimise
|
|||
|
|
</screen>
|
|||
|
|
Since this command needs to read the entire Nix store, it can take
|
|||
|
|
quite a while to finish.</para>
|
|||
|
|
|
|||
|
|
</chapter>
|