{
  # Add user to docker group.
  users.users.fern = {
    extraGroups = ["docker"];
  };

  # Enable docker.
  virtualisation.docker = {
    enable = true;
    liveRestore = true;
    daemon.settings.default-address-pools = [
      {
        base = "172.20.0.0/12";
        size = 24;
      }
    ];
  };
}