nixpkgs/nixos/doc/manual/configuration/profiles/installation-device.xml

<section 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-profile-installation-device">
 <title>Installation Device</title>

 <para>
  Provides a basic configuration for installation devices like CDs.
  This enables redistributable firmware, includes the
  <link linkend="sec-profile-clone-config">Clone Config profile</link>
  and a copy of the Nixpkgs channel, so <command>nixos-install</command>
  works out of the box.
 </para>
 <para>
  Documentation for <link linkend="opt-documentation.enable">Nixpkgs</link>
  and <link linkend="opt-documentation.nixos.enable">NixOS</link> are
  forcefully enabled (to override the
  <link linkend="sec-profile-minimal">Minimal profile</link> preference); the
  NixOS manual is shown automatically on TTY 8, udisks is disabled.
  Autologin is enabled as <literal>nixos</literal> user, while passwordless
  login as both <literal>root</literal> and <literal>nixos</literal> is possible.
  Passwordless <command>sudo</command> is enabled too.
  <link linkend="opt-networking.wireless.enable">wpa_supplicant</link> is
  enabled, but configured to not autostart.
 </para>
 <para>
  It is explained how to login, start the ssh server, and if available,
  how to start the display manager.
 </para>

 <para>
  Several settings are tweaked so that the installer has a better chance of
  succeeding under low-memory environments.
 </para>
</section>