214 lines
6.3 KiB
XML
214 lines
6.3 KiB
XML
<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>
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</refentrytitle><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>
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</refname><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>
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<option>--force</option>
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</arg>
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<arg>
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<arg choice='plain'>
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<option>--root</option>
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</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'>
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<option>--dir</option>
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</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>
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<title>Description</title>
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<para>
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This command writes two NixOS configuration modules:
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<variablelist>
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<varlistentry>
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<term>
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<option>/etc/nixos/hardware-configuration.nix</option>
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</term>
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<listitem>
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<para>
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This module sets NixOS configuration options based on your current
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hardware configuration. In particular, it sets the
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<option>fileSystem</option> option to reflect all currently mounted file
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systems, the <option>swapDevices</option> option to reflect active swap
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devices, and the <option>boot.initrd.*</option> options to ensure that
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the initial ramdisk contains any kernel modules necessary for mounting
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the root file system.
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</para>
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<para>
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If this file already exists, it is overwritten. Thus, you should not
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modify it manually. Rather, you should include it from your
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<filename>/etc/nixos/configuration.nix</filename>, and re-run
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<command>nixos-generate-config</command> to update it whenever your
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hardware configuration changes.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>/etc/nixos/configuration.nix</option>
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</term>
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<listitem>
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<para>
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This is the main NixOS system configuration module. If it already
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exists, it’s left unchanged. Otherwise,
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<command>nixos-generate-config</command> will write a template for you
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to customise.
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</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>
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<title>Options</title>
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<para>
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This command accepts the following options:
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</para>
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<variablelist>
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<varlistentry>
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<term>
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<option>--root</option>
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</term>
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<listitem>
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<para>
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If this option is given, treat the directory
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<replaceable>root</replaceable> as the root of the file system. This
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means that configuration files will be written to
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<filename><replaceable>root</replaceable>/etc/nixos</filename>, and that
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any file systems outside of <replaceable>root</replaceable> are ignored
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for the purpose of generating the <option>fileSystems</option> option.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--dir</option>
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</term>
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<listitem>
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<para>
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If this option is given, write the configuration files to the directory
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<replaceable>dir</replaceable> instead of
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<filename>/etc/nixos</filename>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--force</option>
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</term>
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<listitem>
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<para>
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Overwrite <filename>/etc/nixos/configuration.nix</filename> if it already
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exists.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--no-filesystems</option>
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</term>
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<listitem>
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<para>
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Omit everything concerning file systems and swap devices from the
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hardware configuration.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--show-hardware-config</option>
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</term>
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<listitem>
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<para>
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Don't generate <filename>configuration.nix</filename> or
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<filename>hardware-configuration.nix</filename> and print the hardware
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configuration to stdout only.
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</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>
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<title>Examples</title>
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<para>
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This command is typically used during NixOS installation to write initial
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configuration modules. For example, if you created and mounted the target
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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 look
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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 should edit
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to customise the logical configuration of your system. This file includes
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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>
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After installation, if your hardware configuration changes, you 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>. Your
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<filename>/etc/nixos/configuration.nix</filename> will
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<emphasis>not</emphasis> be overwritten.
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</para>
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</refsection>
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</refentry>
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