mesos-slave.nix

let
  lib = import <nixpkgs/lib>;

  docker_registry = https://docker-registry.example.com;
  master_zk_url = zk://zookeeper.example:2181/mesos;

  attributes = {
    os = "nixos";
    host = null;  # hostname
    rack = "1";   # us-east-1a etc
    instance_type = null;  # t2.medium etc
    instance_id = null;    # i-eb321ba8 etc
  };

  attrstring =
    lib.concatStringsSep ";" (lib.mapAttrsToList
                               (k: v: "${k}:${v}")
                               (lib.filterAttrs (k: v: v != null) attributes));

in
{
  network.description = "mesos slave";

  mesos_slave = { config, pkgs, ... }:
    { networking.firewall.enable = false;

      virtualisation.docker = {
        enable = true;
        extraOptions = ''--registry-mirror=${docker_registry}'';
      };

      services.mesos.slave = {
        inherit attributes;
        enable = true;
        master = master_zk_url;
        extraCmdLineOptions = [
          "--executor_registration_timeout=3mins"
          "--strict=false"
          #"--attributes=${attrstring}"
          ];

      };
    };
}