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Document nixos-generate-config
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Eelco Dolstra
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nixos/doc/manual/man-nixos-generate-config.xml
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nixos/doc/manual/man-nixos-generate-config.xml
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<refentry 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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<refmeta>
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<refentrytitle><command>nixos-generate-config</command></refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">NixOS</refmiscinfo>
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<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
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</refmeta>
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<refnamediv>
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<refname><command>nixos-generate-config</command></refname>
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<refpurpose>generate NixOS configuration modules</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nixos-generate-config</command>
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<arg><option>--force</option></arg>
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<arg>
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<arg choice='plain'><option>--root</option></arg>
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<replaceable>root</replaceable>
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</arg>
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<arg>
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<arg choice='plain'><option>--dir</option></arg>
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<replaceable>dir</replaceable>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>This command writes two NixOS configuration modules:
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<variablelist>
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<varlistentry>
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<term><option>/etc/nixos/hardware-configuration.nix</option></term>
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<listitem>
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<para>This module sets NixOS configuration options based on your
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current hardware configuration. In particular, it sets the
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<option>fileSystem</option> option to reflect all currently
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mounted file systems, the <option>swapDevices</option> option to
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reflect active swap devices, and the
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<option>boot.initrd.*</option> options to ensure that the
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initial ramdisk contains any kernel modules necessary for
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mounting the root file system.</para>
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<para>If this file already exists, it is overwritten. Thus, you
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should not modify it manually. Rather, you should include it
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from your <filename>/etc/nixos/configuration.nix</filename>, and
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re-run <command>nixos-generate-config</command> to update it
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whenever your hardware configuration changes.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>/etc/nixos/configuration.nix</option></term>
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<listitem>
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<para>This is the main NixOS system configuration module. If it
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already exists, it’s left unchanged. Otherwise,
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<command>nixos-generate-config</command> will write a template
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for you to customise.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsection>
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<refsection><title>Options</title>
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<para>This command accepts the following options:</para>
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<variablelist>
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<varlistentry>
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<term><option>--root</option></term>
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<listitem>
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<para>If this option is given, treat the directory
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<replaceable>root</replaceable> as the root of the file system.
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This means that configuration files will be written to
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<filename><replaceable>root</replaceable>/etc/nixos</filename>,
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and that any file systems outside of
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<replaceable>root</replaceable> are ignored for the purpose of
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generating the <option>fileSystems</option> option.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--dir</option></term>
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<listitem>
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<para>If this option is given, write the configuration files to
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the directory <replaceable>dir</replaceable> instead of
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<filename>/etc/nixos</filename>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--force</option></term>
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<listitem>
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<para>Overwrite
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<filename>/etc/nixos/configuration.nix</filename> if it already
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exists.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Examples</title>
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<para>This command is typically used during NixOS installation to
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write initial configuration modules. For example, if you created and
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mounted the target file systems on <filename>/mnt</filename> and
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<filename>/mnt/boot</filename>, you would run:
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<screen>
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$ nixos-generate-config --root /mnt
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</screen>
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The resulting file
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<filename>/mnt/etc/nixos/hardware-configuration.nix</filename> might
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look like this:
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<programlisting>
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# Do not modify this file! It was generated by ‘nixos-generate-config’
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# and may be overwritten by future invocations. Please make changes
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# to /etc/nixos/configuration.nix instead.
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{ config, pkgs, ... }:
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{
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imports =
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[ <nixos/modules/installer/scan/not-detected.nix>
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];
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boot.initrd.availableKernelModules = [ "ehci_hcd" "ahci" ];
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boot.kernelModules = [ "kvm-intel" ];
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boot.extraModulePackages = [ ];
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fileSystems."/" =
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{ device = "/dev/disk/by-label/nixos";
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fsType = "ext3";
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options = "rw,data=ordered,relatime";
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};
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fileSystems."/boot" =
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{ device = "/dev/sda1";
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fsType = "ext3";
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options = "rw,errors=continue,user_xattr,acl,barrier=1,data=writeback,relatime";
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};
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swapDevices =
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[ { device = "/dev/sda2"; }
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];
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nix.maxJobs = 8;
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}
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</programlisting>
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It will also create a basic
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<filename>/mnt/etc/nixos/configuration.nix</filename>, which you
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should edit to customise the logical configuration of your system.
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This file includes the result of the hardware scan as follows:
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<programlisting>
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imports = [ ./hardware-configuration.nix ];
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</programlisting>
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</para>
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<para>After installation, if your hardware configuration changes, you
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can run:
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<screen>
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$ nixos-generate-config
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</screen>
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to update <filename>/etc/nixos/hardware-configuration.nix</filename>.
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Your <filename>/etc/nixos/configuration.nix</filename> will
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<emphasis>not</emphasis> be overwritten.</para>
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</refsection>
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</refentry>
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@ -15,17 +15,16 @@
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</author>
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<copyright>
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<year>2007</year>
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<year>2008</year>
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<year>2009</year>
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<year>2007-2013</year>
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<holder>Eelco Dolstra</holder>
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</copyright>
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</info>
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<xi:include href="man-configuration.xml" />
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<xi:include href="man-nixos-rebuild.xml" />
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<xi:include href="man-nixos-generate-config.xml" />
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<xi:include href="man-nixos-option.xml" />
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<xi:include href="man-nixos-build-vms.xml" />
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</reference>
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