Description of ZeroMQ configuration options

Configuration option = Default value	Description
[DEFAULT]
rpc_zmq_all_req_rep = True	(BoolOpt) Use REQ/REP pattern for all methods CALL/CAST/FANOUT.
rpc_zmq_bind_address = *	(StrOpt) ZeroMQ bind address. Should be a wildcard (*), an ethernet interface, or IP. The "host" option should point or resolve to this address.
rpc_zmq_concurrency = eventlet	(StrOpt) Type of concurrency used. Either "native" or "eventlet"
rpc_zmq_contexts = 1	(IntOpt) Number of ZeroMQ contexts, defaults to 1.
rpc_zmq_host = localhost	(StrOpt) 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	(StrOpt) Directory for holding IPC sockets.
rpc_zmq_matchmaker = redis	(StrOpt) MatchMaker driver.
rpc_zmq_topic_backlog = None	(IntOpt) Maximum number of ingress messages to locally buffer per topic. Default is unlimited.
zmq_use_broker = True	(BoolOpt) Shows whether zmq-messaging uses broker or not.