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Diffstat (limited to 'nixos/doc/manual/administration/cleaning-store.xml')
| -rw-r--r-- | nixos/doc/manual/administration/cleaning-store.xml | 69 |
1 files changed, 30 insertions, 39 deletions
diff --git a/nixos/doc/manual/administration/cleaning-store.xml b/nixos/doc/manual/administration/cleaning-store.xml index 4cf62947f528..ee201982a40b 100644 --- a/nixos/doc/manual/administration/cleaning-store.xml +++ b/nixos/doc/manual/administration/cleaning-store.xml @@ -3,60 +3,51 @@ 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: - + <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: - + 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: - + 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"; +<xref linkend="opt-nix.gc.automatic"/> = true; +<xref linkend="opt-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: + </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. + 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. + 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> - + Since this command needs to read the entire Nix store, it can take quite a + while to finish. + </para> </chapter> |