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.. _trove-zeromq:

.. list-table:: Description of ZeroMQ configuration options
   :header-rows: 1
   :class: config-ref-table

   * - Configuration option = Default value
     - Description
   * - **[DEFAULT]**
     -
   * - ``rpc_zmq_bind_address`` = ``*``
     - (String) ZeroMQ bind address. Should be a wildcard (*), an ethernet interface, or IP. The "host" option should point or resolve to this address.
   * - ``rpc_zmq_bind_port_retries`` = ``100``
     - (Integer) Number of retries to find free port number before fail with ZMQBindError.
   * - ``rpc_zmq_concurrency`` = ``eventlet``
     - (String) Type of concurrency used. Either "native" or "eventlet"
   * - ``rpc_zmq_contexts`` = ``1``
     - (Integer) Number of ZeroMQ contexts, defaults to 1.
   * - ``rpc_zmq_host`` = ``localhost``
     - (String) Name of this node. Must be a valid hostname, FQDN, or IP address. Must match "host" option, if running Nova.
   * - ``rpc_zmq_ipc_dir`` = ``/var/run/openstack``
     - (String) Directory for holding IPC sockets.
   * - ``rpc_zmq_matchmaker`` = ``redis``
     - (String) MatchMaker driver.
   * - ``rpc_zmq_max_port`` = ``65536``
     - (Integer) Maximal port number for random ports range.
   * - ``rpc_zmq_min_port`` = ``49152``
     - (Port number) Minimal port number for random ports range.
   * - ``rpc_zmq_topic_backlog`` = ``None``
     - (Integer) Maximum number of ingress messages to locally buffer per topic. Default is unlimited.
   * - ``use_pub_sub`` = ``True``
     - (Boolean) Use PUB/SUB pattern for fanout methods. PUB/SUB always uses proxy.
   * - ``zmq_target_expire`` = ``120``
     - (Integer) Expiration timeout in seconds of a name service record about existing target ( < 0 means no timeout).