anchor.diff:          type = types.uniq types.bool;
         };
   
  +      ip = mkOption {
  +        description = "IP address to listen on.";
  +        default = "0.0.0.0";
  +        type = types.string;
  +      };
  +
         port = mkOption {
  -        description = "Mesos Slave port";
  +        description = "Port to listen on.";
           default = 5051;
           type = types.int;
         };
  
positive.code:       withHadoop = mkOption {
          description = "Add the HADOOP_HOME to the slave.";
          default = false;
          type = types.bool;
        };
  
  
negative.code:   attribsArg = optionalString (cfg.attributes != {})
                                "--attributes=${mkAttributes cfg.attributes}";
  
    containerizers = [ "mesos" ] ++ (optional cfg.withDocker "docker");
  
  in {
  
    options.services.mesos = {
  