nixpkgs/nixos/doc/manual/development/building-nixos.xml

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<chapter 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-building-cd">
<title>Building Your Own NixOS CD</title>
<para>Building a NixOS CD is as easy as configuring your own computer. The
idea is to use another module which will replace
your <filename>configuration.nix</filename> to configure the system that
would be installed on the CD.</para>
<para>Default CD/DVD configurations are available
inside <filename>nixos/modules/installer/cd-dvd</filename>. To build them
you have to set <envar>NIXOS_CONFIG</envar> before
running <command>nix-build</command> to build the ISO.
<screen>
$ nix-build -A config.system.build.isoImage -I nixos-config=modules/installer/cd-dvd/installation-cd-minimal.nix</screen>
</para>
<para>Before burning your CD/DVD, you can check the content of the image by mounting anywhere like
suggested by the following command:
<screen>
# mount -o loop -t iso9660 ./result/iso/cd.iso /mnt/iso</screen>
</para>
</chapter>