Bobby Rong
3 years ago
parent
e4ad7d6fc7
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c603692b0c
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# Cleaning the Nix Store {#sec-nix-gc} |
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|
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Nix has a purely functional model, meaning that packages are never |
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upgraded in place. Instead new versions of packages end up in a |
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different location in the Nix store (`/nix/store`). You should |
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periodically run Nix's *garbage collector* to remove old, unreferenced |
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packages. This is easy: |
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|
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```ShellSession |
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$ nix-collect-garbage |
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``` |
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|
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Alternatively, you can use a systemd unit that does the same in the |
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background: |
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|
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```ShellSession |
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# systemctl start nix-gc.service |
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``` |
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|
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You can tell NixOS in `configuration.nix` to run this unit automatically |
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at certain points in time, for instance, every night at 03:15: |
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|
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```nix |
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nix.gc.automatic = true; |
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nix.gc.dates = "03:15"; |
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``` |
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|
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The commands above do not remove garbage collector roots, such as old |
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system configurations. Thus they do not remove the ability to roll back |
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to previous configurations. The following command deletes old roots, |
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removing the ability to roll back to them: |
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|
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```ShellSession |
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$ nix-collect-garbage -d |
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``` |
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|
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You can also do this for specific profiles, e.g. |
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|
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```ShellSession |
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$ nix-env -p /nix/var/nix/profiles/per-user/eelco/profile --delete-generations old |
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``` |
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|
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Note that NixOS system configurations are stored in the profile |
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`/nix/var/nix/profiles/system`. |
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|
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Another way to reclaim disk space (often as much as 40% of the size of |
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the Nix store) is to run Nix's store optimiser, which seeks out |
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identical files in the store and replaces them with hard links to a |
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single copy. |
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|
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```ShellSession |
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$ nix-store --optimise |
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``` |
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|
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Since this command needs to read the entire Nix store, it can take quite |
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a while to finish. |
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|
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## NixOS Boot Entries {#sect-nixos-gc-boot-entries} |
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|
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If your `/boot` partition runs out of space, after clearing old profiles |
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you must rebuild your system with `nixos-rebuild` to update the `/boot` |
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partition and clear space. |
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@ -1,63 +0,0 @@ |
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<chapter xmlns="http://docbook.org/ns/docbook" |
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xmlns:xlink="http://www.w3.org/1999/xlink" |
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xmlns:xi="http://www.w3.org/2001/XInclude" |
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version="5.0" |
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xml:id="sec-nix-gc"> |
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<title>Cleaning the Nix Store</title> |
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<para> |
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Nix has a purely functional model, meaning that packages are never upgraded |
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in place. Instead new versions of packages end up in a different location in |
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the Nix store (<filename>/nix/store</filename>). You should periodically run |
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Nix’s <emphasis>garbage collector</emphasis> to remove old, unreferenced |
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packages. This is easy: |
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<screen> |
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<prompt>$ </prompt>nix-collect-garbage |
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</screen> |
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Alternatively, you can use a systemd unit that does the same in the |
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background: |
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<screen> |
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<prompt># </prompt>systemctl start nix-gc.service |
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</screen> |
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You can tell NixOS in <filename>configuration.nix</filename> to run this unit |
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automatically at certain points in time, for instance, every night at 03:15: |
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<programlisting> |
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<xref linkend="opt-nix.gc.automatic"/> = true; |
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<xref linkend="opt-nix.gc.dates"/> = "03:15"; |
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</programlisting> |
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</para> |
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<para> |
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The commands above do not remove garbage collector roots, such as old system |
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configurations. Thus they do not remove the ability to roll back to previous |
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configurations. The following command deletes old roots, removing the ability |
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to roll back to them: |
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<screen> |
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<prompt>$ </prompt>nix-collect-garbage -d |
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</screen> |
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You can also do this for specific profiles, e.g. |
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<screen> |
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<prompt>$ </prompt>nix-env -p /nix/var/nix/profiles/per-user/eelco/profile --delete-generations old |
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</screen> |
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Note that NixOS system configurations are stored in the profile |
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<filename>/nix/var/nix/profiles/system</filename>. |
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</para> |
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<para> |
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Another way to reclaim disk space (often as much as 40% of the size of the |
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Nix store) is to run Nix’s store optimiser, which seeks out identical files |
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in the store and replaces them with hard links to a single copy. |
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<screen> |
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<prompt>$ </prompt>nix-store --optimise |
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</screen> |
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Since this command needs to read the entire Nix store, it can take quite a |
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while to finish. |
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</para> |
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<section xml:id="sect-nixos-gc-boot-entries"> |
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<title>NixOS Boot Entries</title> |
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|
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<para> |
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If your <filename>/boot</filename> partition runs out of space, after |
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clearing old profiles you must rebuild your system with |
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<literal>nixos-rebuild</literal> to update the <filename>/boot</filename> |
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partition and clear space. |
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</para> |
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</section> |
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</chapter> |
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@ -0,0 +1,71 @@ |
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<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-nix-gc"> |
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<title>Cleaning the Nix Store</title> |
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<para> |
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Nix has a purely functional model, meaning that packages are never |
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upgraded in place. Instead new versions of packages end up in a |
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different location in the Nix store (<literal>/nix/store</literal>). |
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You should periodically run Nix’s <emphasis>garbage |
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collector</emphasis> to remove old, unreferenced packages. This is |
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easy: |
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</para> |
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<programlisting> |
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$ nix-collect-garbage |
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</programlisting> |
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<para> |
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Alternatively, you can use a systemd unit that does the same in the |
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background: |
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</para> |
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<programlisting> |
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# systemctl start nix-gc.service |
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</programlisting> |
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<para> |
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You can tell NixOS in <literal>configuration.nix</literal> to run |
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this unit automatically at certain points in time, for instance, |
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every night at 03:15: |
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</para> |
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<programlisting language="bash"> |
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nix.gc.automatic = true; |
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nix.gc.dates = "03:15"; |
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</programlisting> |
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<para> |
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The commands above do not remove garbage collector roots, such as |
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old system configurations. Thus they do not remove the ability to |
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roll back to previous configurations. The following command deletes |
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old roots, removing the ability to roll back to them: |
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</para> |
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<programlisting> |
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$ nix-collect-garbage -d |
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</programlisting> |
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<para> |
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You can also do this for specific profiles, e.g. |
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</para> |
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<programlisting> |
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$ nix-env -p /nix/var/nix/profiles/per-user/eelco/profile --delete-generations old |
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</programlisting> |
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<para> |
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Note that NixOS system configurations are stored in the profile |
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<literal>/nix/var/nix/profiles/system</literal>. |
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</para> |
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<para> |
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Another way to reclaim disk space (often as much as 40% of the size |
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of the Nix store) is to run Nix’s store optimiser, which seeks out |
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identical files in the store and replaces them with hard links to a |
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single copy. |
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</para> |
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<programlisting> |
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$ nix-store --optimise |
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</programlisting> |
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<para> |
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Since this command needs to read the entire Nix store, it can take |
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quite a while to finish. |
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</para> |
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<section xml:id="sect-nixos-gc-boot-entries"> |
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<title>NixOS Boot Entries</title> |
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<para> |
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If your <literal>/boot</literal> partition runs out of space, |
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after clearing old profiles you must rebuild your system with |
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<literal>nixos-rebuild</literal> to update the |
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<literal>/boot</literal> partition and clear space. |
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</para> |
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</section> |
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</chapter> |
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