{
  config,
  lib,
  pkgs,
  self,
  ...
}: let
  exDomain = (import ./ex-domain.nix) lib;
  pubsolarDomain = import ./pubsolar-domain.nix;

  hostingdeProviderConf = {
    dnsProvider = "hostingde";
    credentialsFile = "${pkgs.writeText "hostingde-creds" ''
      HOSTINGDE_API_KEY_FILE=${config.age.secrets."hosting.de-api.key".path}
    ''}";
  };
in {
  age.secrets."hosting.de-api.key" = {
    file = "${self}/secrets/hosting.de-api.key";
    mode = "440";
    group = "acme";
  };

  systemd.tmpfiles.rules = [
    "d '/data/acme' 0750 root acme - -"
  ];

  users.groups.acme = {};
  ids.uids.acme = 997;
  ids.gids.acme = 997;

  containers.acme = {
    autoStart = true;
    privateNetwork = true;
    hostAddress = "192.168.101.0";
    localAddress = "192.168.106.0";
    hostAddress6 = "fc00::1";
    localAddress6 = "fc00::6";

    bindMounts = {
      "/var/lib/acme" = {
        hostPath = "/data/acme";
        isReadOnly = false;
      };

      "${config.age.secrets."hosting.de-api.key".path}" = {
        hostPath = "${config.age.secrets."hosting.de-api.key".path}";
        isReadOnly = true;
      };
    };

    config = {
      networking.nameservers = ["1.1.1.1"];
      users.groups.acme = config.users.groups.acme;

      security.acme = {
        acceptTerms = true;
        defaults.email = "acme@benjaminbaedorf.eu";
        defaults.server = "https://acme-staging-v02.api.letsencrypt.org/directory";
        defaults.group = "acme";

        certs."b12f.io" = hostingdeProviderConf;
        certs."mail.b12f.io" = hostingdeProviderConf;
        certs."transmission.b12f.io" = hostingdeProviderConf;

        certs."${exDomain}" = hostingdeProviderConf;
        certs."mail.${exDomain}" = hostingdeProviderConf;

        certs."${pubsolarDomain}" = hostingdeProviderConf;
        certs."www.${pubsolarDomain}" = hostingdeProviderConf;
        certs."auth.${pubsolarDomain}" = hostingdeProviderConf;
        certs."git.${pubsolarDomain}" = hostingdeProviderConf;
        certs."ci.${pubsolarDomain}" = hostingdeProviderConf;
        certs."list.${pubsolarDomain}" = hostingdeProviderConf;
        certs."obs-portal.${pubsolarDomain}" = hostingdeProviderConf;
      };
    };
  };
}