[root@sakura:/etc/nixos]# cat /etc/nixos/server.nix
# Server configuration.
{ config, pkgs, ... }:
{
  services = {
    lighttpd = {
      document-root = /srv/http;
      enableModules = [ "mod_simple_vhost" ];
      extraConfig = ''
        simple-vhost.server-root   = "/srv/http"
        simple-vhost.default-host  = "localhost"
        simple-vhost.document-root = "/htdocs"
      '';
    };
    gitea = {
      cookieSecure = true;
      repositoryRoot = "/srv/git";
      user = "git";
      appName = "Fireburn's Git";
      rootUrl = "https://git.fireburn.ru";
    };
  };

  users = {
    users = if config.services.gitea.enable == true then {
      git = {
        name = config.services.gitea.user;
        description = "Gitea Service";
        home = config.services.gitea.stateDir;
        createHome = true;
        useDefaultShell = true;
        isNormalUser = false;
        isSystemUser = true;
      };
    } else {};
  };
}
# vim: ts=2 sts=2 sw=2 et

[root@sakura:/etc/nixos]# cat /etc/nixos/containers/web.nix
{ config, lib, pkgs, ... }:

with lib;

{

  imports = [
    ../server.nix
  ];

  boot.isContainer = true;
  networking = {
    hostName = mkDefault "web.fireburn.ru";
    useDHCP = false;
    firewall = {
      allowedTCPPorts = [ 80 443 ];
    };
  };

  services = {
    lighttpd = {
      enable = true;
    };
  };
}

[root@sakura:/etc/nixos]# cat /etc/nixos/configuration.nix
# Site-specific configuration file.
{ config, pkgs, ... }:
{
  imports =
    [
      # Common configuration
      ./common.nix
      # Uncomment for a server system
      #./server.nix
      # Uncomment for a desktop system
      ./desktop.nix
    ];

  # <snip!>

  containers = {
    gitea = (import containers/gitea.nix);
  };
}

[root@sakura:/etc/nixos]# nixos-rebuild test
building Nix...
building the system configuration...
error: The option `containers.gitea.services' defined in `/etc/nixos/server.nix' does not exist.
(use '--show-trace' to show detailed location information)