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-<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" 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 (<literal>/nix/store</literal>).
-    You should periodically run Nix’s <emphasis>garbage
-    collector</emphasis> to remove old, unreferenced packages. This is
-    easy:
-  </para>
-  <programlisting>
-$ nix-collect-garbage
-</programlisting>
-  <para>
-    Alternatively, you can use a systemd unit that does the same in the
-    background:
-  </para>
-  <programlisting>
-# systemctl start nix-gc.service
-</programlisting>
-  <para>
-    You can tell NixOS in <literal>configuration.nix</literal> to run
-    this unit automatically at certain points in time, for instance,
-    every night at 03:15:
-  </para>
-  <programlisting language="bash">
-nix.gc.automatic = true;
-nix.gc.dates = &quot;03:15&quot;;
-</programlisting>
-  <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>
-  <programlisting>
-$ nix-collect-garbage -d
-</programlisting>
-  <para>
-    You can also do this for specific profiles, e.g.
-  </para>
-  <programlisting>
-$ nix-env -p /nix/var/nix/profiles/per-user/eelco/profile --delete-generations old
-</programlisting>
-  <para>
-    Note that NixOS system configurations are stored in the profile
-    <literal>/nix/var/nix/profiles/system</literal>.
-  </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.
-  </para>
-  <programlisting>
-$ nix-store --optimise
-</programlisting>
-  <para>
-    Since this command needs to read the entire Nix store, it can take
-    quite a while to finish.
-  </para>
-  <section xml:id="sect-nixos-gc-boot-entries">
-    <title>NixOS Boot Entries</title>
-    <para>
-      If your <literal>/boot</literal> partition runs out of space,
-      after clearing old profiles you must rebuild your system with
-      <literal>nixos-rebuild boot</literal> or
-      <literal>nixos-rebuild switch</literal> to update the
-      <literal>/boot</literal> partition and clear space.
-    </para>
-  </section>
-</chapter>