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nixos: nixos/doc/manual/administration/rollback.xml to CommonMark

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38
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# Rolling Back Configuration Changes {#sec-rollback}
After running `nixos-rebuild` to switch to a new configuration, you may
find that the new configuration doesn't work very well. In that case,
there are several ways to return to a previous configuration.
First, the GRUB boot manager allows you to boot into any previous
configuration that hasn't been garbage-collected. These configurations
can be found under the GRUB submenu "NixOS - All configurations". This
is especially useful if the new configuration fails to boot. After the
system has booted, you can make the selected configuration the default
for subsequent boots:
```ShellSession
# /run/current-system/bin/switch-to-configuration boot
```
Second, you can switch to the previous configuration in a running
system:
```ShellSession
# nixos-rebuild switch --rollback
```
This is equivalent to running:
```ShellSession
# /nix/var/nix/profiles/system-N-link/bin/switch-to-configuration switch
```
where `N` is the number of the NixOS system configuration. To get a
list of the available configurations, do:
```ShellSession
$ ls -l /nix/var/nix/profiles/system-*-link
...
lrwxrwxrwx 1 root root 78 Aug 12 13:54 /nix/var/nix/profiles/system-268-link -> /nix/store/202b...-nixos-13.07pre4932_5a676e4-4be1055
```

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nixos/doc/manual/administration/rollback.xml
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<section 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-rollback">
<title>Rolling Back Configuration Changes</title>
<para>
After running <command>nixos-rebuild</command> to switch to a new
configuration, you may find that the new configuration doesn’t work very
well. In that case, there are several ways to return to a previous
configuration.
</para>
<para>
First, the GRUB boot manager allows you to boot into any previous
configuration that hasn’t been garbage-collected. These configurations can
be found under the GRUB submenu “NixOS - All configurations”. This is
especially useful if the new configuration fails to boot. After the system
has booted, you can make the selected configuration the default for
subsequent boots:
<screen>
<prompt># </prompt>/run/current-system/bin/switch-to-configuration boot</screen>
</para>
<para>
Second, you can switch to the previous configuration in a running system:
<screen>
<prompt># </prompt>nixos-rebuild switch --rollback</screen>
This is equivalent to running:
<screen>
<prompt># </prompt>/nix/var/nix/profiles/system-<replaceable>N</replaceable>-link/bin/switch-to-configuration switch</screen>
where <replaceable>N</replaceable> is the number of the NixOS system
configuration. To get a list of the available configurations, do:
<screen>
<prompt>$ </prompt>ls -l /nix/var/nix/profiles/system-*-link
<replaceable>...</replaceable>
lrwxrwxrwx 1 root root 78 Aug 12 13:54 /nix/var/nix/profiles/system-268-link -> /nix/store/202b...-nixos-13.07pre4932_5a676e4-4be1055
</screen>
</para>
</section>

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nixos/doc/manual/administration/troubleshooting.xml
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</para>
<xi:include href="../from_md/administration/boot-problems.section.xml" />
<xi:include href="../from_md/administration/maintenance-mode.section.xml" />
<xi:include href="rollback.xml" />
<xi:include href="../from_md/administration/rollback.section.xml" />
<xi:include href="store-corruption.xml" />
<xi:include href="network-problems.xml" />
</chapter>

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<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-rollback">
<title>Rolling Back Configuration Changes</title>
<para>
After running <literal>nixos-rebuild</literal> to switch to a new
configuration, you may find that the new configuration doesn’t work
very well. In that case, there are several ways to return to a
previous configuration.
</para>
<para>
First, the GRUB boot manager allows you to boot into any previous
configuration that hasn’t been garbage-collected. These
configurations can be found under the GRUB submenu <quote>NixOS -
All configurations</quote>. This is especially useful if the new
configuration fails to boot. After the system has booted, you can
make the selected configuration the default for subsequent boots:
</para>
<programlisting>
# /run/current-system/bin/switch-to-configuration boot
</programlisting>
<para>
Second, you can switch to the previous configuration in a running
system:
</para>
<programlisting>
# nixos-rebuild switch --rollback
</programlisting>
<para>
This is equivalent to running:
</para>
<programlisting>
# /nix/var/nix/profiles/system-N-link/bin/switch-to-configuration switch
</programlisting>
<para>
where <literal>N</literal> is the number of the NixOS system
configuration. To get a list of the available configurations, do:
</para>
<programlisting>
$ ls -l /nix/var/nix/profiles/system-*-link
...
lrwxrwxrwx 1 root root 78 Aug 12 13:54 /nix/var/nix/profiles/system-268-link -&gt; /nix/store/202b...-nixos-13.07pre4932_5a676e4-4be1055
</programlisting>
</section>