# Building Your Own NixOS CD

Building a NixOS CD is as easy as configuring your own computer. The idea is to use another module which will replace your `configuration.nix` to configure the system that would be installed on the CD.

Default CD/DVD configurations are available inside `nixos/modules/installer/cd-dvd`. To build them you have to set `NIXOS_CONFIG` before running `nix-build` to build the ISO.

    $ nix-build -A config.system.build.isoImage -I nixos-config=modules/installer/cd-dvd/installation-cd-minimal.nix

Before burning your CD/DVD, you can check the content of the image by mounting anywhere like suggested by the following command:

    $ mount -o loop -t iso9660 ./result/iso/cd.iso /mnt/iso