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* manual: Mark commands that require root Mark every command that requires to be run as root by prefixing them with '#' instead of '$'. * manual: Add note about commands that require root
49 lines
1.6 KiB
XML
49 lines
1.6 KiB
XML
<section 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-rollback">
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<title>Rolling Back Configuration Changes</title>
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<para>After running <command>nixos-rebuild</command> to switch to a
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new configuration, you may find that the new configuration doesn’t
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work very well. In that case, there are several ways to return to a
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previous configuration.</para>
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<para>First, the GRUB boot manager allows you to boot into any
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previous configuration that hasn’t been garbage-collected. These
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configurations can be found under the GRUB submenu “NixOS - All
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configurations”. This is especially useful if the new configuration
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fails to boot. After the system has booted, you can make the selected
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configuration the default for subsequent boots:
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<screen>
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# /run/current-system/bin/switch-to-configuration boot</screen>
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</para>
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<para>Second, you can switch to the previous configuration in a running
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system:
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<screen>
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# nixos-rebuild switch --rollback</screen>
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This is equivalent to running:
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<screen>
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# /nix/var/nix/profiles/system-<replaceable>N</replaceable>-link/bin/switch-to-configuration switch</screen>
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where <replaceable>N</replaceable> is the number of the NixOS system
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configuration. To get a list of the available configurations, do:
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<screen>
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$ ls -l /nix/var/nix/profiles/system-*-link
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<replaceable>...</replaceable>
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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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</screen>
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</para>
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</section>
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