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-<refentry xmlns="http://docbook.org/ns/docbook"
- xmlns:xlink="http://www.w3.org/1999/xlink"
- xmlns:xi="http://www.w3.org/2001/XInclude">
- <refmeta>
- <refentrytitle><command>nixos-generate-config</command>
- </refentrytitle><manvolnum>8</manvolnum>
- <refmiscinfo class="source">NixOS</refmiscinfo>
-<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
- </refmeta>
- <refnamediv>
- <refname><command>nixos-generate-config</command></refname>
- <refpurpose>generate NixOS configuration modules</refpurpose>
- </refnamediv>
- <refsynopsisdiv>
- <cmdsynopsis>
- <command>nixos-generate-config</command>
- <arg>
- <option>--force</option>
- </arg>
-
- <arg>
- <arg choice='plain'>
- <option>--root</option>
- </arg>
- <replaceable>root</replaceable>
- </arg>
-
- <arg>
- <arg choice='plain'>
- <option>--dir</option>
- </arg>
- <replaceable>dir</replaceable>
- </arg>
- </cmdsynopsis>
- </refsynopsisdiv>
- <refsection>
- <title>Description</title>
- <para>
- This command writes two NixOS configuration modules:
- <variablelist>
- <varlistentry>
- <term>
- <option>/etc/nixos/hardware-configuration.nix</option>
- </term>
- <listitem>
- <para>
- This module sets NixOS configuration options based on your current
- hardware configuration. In particular, it sets the
- <option>fileSystem</option> option to reflect all currently mounted file
- systems, the <option>swapDevices</option> option to reflect active swap
- devices, and the <option>boot.initrd.*</option> options to ensure that
- the initial ramdisk contains any kernel modules necessary for mounting
- the root file system.
- </para>
- <para>
- If this file already exists, it is overwritten. Thus, you should not
- modify it manually. Rather, you should include it from your
- <filename>/etc/nixos/configuration.nix</filename>, and re-run
- <command>nixos-generate-config</command> to update it whenever your
- hardware configuration changes.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <option>/etc/nixos/configuration.nix</option>
- </term>
- <listitem>
- <para>
- This is the main NixOS system configuration module. If it already
- exists, it’s left unchanged. Otherwise,
- <command>nixos-generate-config</command> will write a template for you
- to customise.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </para>
- </refsection>
- <refsection>
- <title>Options</title>
- <para>
- This command accepts the following options:
- </para>
- <variablelist>
- <varlistentry>
- <term>
- <option>--root</option>
- </term>
- <listitem>
- <para>
- If this option is given, treat the directory
- <replaceable>root</replaceable> as the root of the file system. This
- means that configuration files will be written to
- <filename><replaceable>root</replaceable>/etc/nixos</filename>, and that
- any file systems outside of <replaceable>root</replaceable> are ignored
- for the purpose of generating the <option>fileSystems</option> option.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <option>--dir</option>
- </term>
- <listitem>
- <para>
- If this option is given, write the configuration files to the directory
- <replaceable>dir</replaceable> instead of
- <filename>/etc/nixos</filename>.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <option>--force</option>
- </term>
- <listitem>
- <para>
- Overwrite <filename>/etc/nixos/configuration.nix</filename> if it already
- exists.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <option>--no-filesystems</option>
- </term>
- <listitem>
- <para>
- Omit everything concerning file systems and swap devices from the
- hardware configuration.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>
- <option>--show-hardware-config</option>
- </term>
- <listitem>
- <para>
- Don't generate <filename>configuration.nix</filename> or
- <filename>hardware-configuration.nix</filename> and print the hardware
- configuration to stdout only.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsection>
- <refsection>
- <title>Examples</title>
- <para>
- This command is typically used during NixOS installation to write initial
- configuration modules. For example, if you created and mounted the target
- file systems on <filename>/mnt</filename> and
- <filename>/mnt/boot</filename>, you would run:
-<screen>
-<prompt>$ </prompt>nixos-generate-config --root /mnt
-</screen>
- The resulting file
- <filename>/mnt/etc/nixos/hardware-configuration.nix</filename> might look
- like this:
-<programlisting>
-# Do not modify this file! It was generated by ‘nixos-generate-config’
-# and may be overwritten by future invocations. Please make changes
-# to /etc/nixos/configuration.nix instead.
-{ config, pkgs, ... }:
-
-{
- imports =
- [ &lt;nixos/modules/installer/scan/not-detected.nix&gt;
- ];
-
- boot.initrd.availableKernelModules = [ "ehci_hcd" "ahci" ];
- boot.kernelModules = [ "kvm-intel" ];
- boot.extraModulePackages = [ ];
-
- fileSystems."/" =
- { device = "/dev/disk/by-label/nixos";
- fsType = "ext3";
- options = [ "rw" "data=ordered" "relatime" ];
- };
-
- fileSystems."/boot" =
- { device = "/dev/sda1";
- fsType = "ext3";
- options = [ "rw" "errors=continue" "user_xattr" "acl" "barrier=1" "data=writeback" "relatime" ];
- };
-
- swapDevices =
- [ { device = "/dev/sda2"; }
- ];
-
- nix.maxJobs = 8;
-}
-</programlisting>
- It will also create a basic
- <filename>/mnt/etc/nixos/configuration.nix</filename>, which you should edit
- to customise the logical configuration of your system. This file includes
- the result of the hardware scan as follows:
-<programlisting>
- imports = [ ./hardware-configuration.nix ];
-</programlisting>
- </para>
- <para>
- After installation, if your hardware configuration changes, you can run:
-<screen>
-<prompt>$ </prompt>nixos-generate-config
-</screen>
- to update <filename>/etc/nixos/hardware-configuration.nix</filename>. Your
- <filename>/etc/nixos/configuration.nix</filename> will
- <emphasis>not</emphasis> be overwritten.
- </para>
- </refsection>
-</refentry>