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 Configure the Oslo RPC messaging system

OpenStack projects use AMQP, an open standard for messaging middleware. OpenStack services that run on multiple servers to talk to each other. OpenStack Oslo RPC supports three implementations of AMQP: RabbitMQ, Qpid, and ZeroMQ.

 Configure RabbitMQ

OpenStack Oslo RPC uses RabbitMQ by default. Use these options to configure the RabbitMQ message system. The rpc_backend option is not required as long as RabbitMQ is the default messaging system. However, if it is included the configuration, you must set it to nova.openstack.common.rpc.impl_kombu.


You can use these additional options to configure the RabbitMQ messaging system. You can configure messaging communication for different installation scenarios, tune retries for RabbitMQ, and define the size of the RPC thread pool. To monitor notifications through RabbitMQ, you must set the notification_driver option to nova.notifier.rabbit_notifier in the nova.conf file. The default for sending usage data is sixty seconds plus a random number of seconds from zero to sixty.

Table 2.1. Description of configuration options for rabbitmq
Configuration option = Default value Description
rabbit_ha_queues = False (BoolOpt) Use HA queues in RabbitMQ (x-ha-policy: all). If you change this option, you must wipe the RabbitMQ database.
rabbit_host = localhost (StrOpt) The RabbitMQ broker address where a single node is used.
rabbit_hosts = $rabbit_host:$rabbit_port (ListOpt) RabbitMQ HA cluster host:port pairs.
rabbit_login_method = AMQPLAIN (StrOpt) the RabbitMQ login method
rabbit_max_retries = 0 (IntOpt) Maximum number of RabbitMQ connection retries. Default is 0 (infinite retry count).
rabbit_password = guest (StrOpt) The RabbitMQ password.
rabbit_port = 5672 (IntOpt) The RabbitMQ broker port where a single node is used.
rabbit_retry_backoff = 2 (IntOpt) How long to backoff for between retries when connecting to RabbitMQ.
rabbit_retry_interval = 1 (IntOpt) How frequently to retry connecting with RabbitMQ.
rabbit_use_ssl = False (BoolOpt) Connect over SSL for RabbitMQ.
rabbit_userid = guest (StrOpt) The RabbitMQ userid.
rabbit_virtual_host = / (StrOpt) The RabbitMQ virtual host.

Table 2.2. Description of configuration options for kombu
Configuration option = Default value Description
kombu_reconnect_delay = 1.0 (FloatOpt) How long to wait before reconnecting in response to an AMQP consumer cancel notification.
kombu_ssl_ca_certs = (StrOpt) SSL certification authority file (valid only if SSL enabled).
kombu_ssl_certfile = (StrOpt) SSL cert file (valid only if SSL enabled).
kombu_ssl_keyfile = (StrOpt) SSL key file (valid only if SSL enabled).
kombu_ssl_version = (StrOpt) SSL version to use (valid only if SSL enabled). valid values are TLSv1, SSLv23 and SSLv3. SSLv2 may be available on some distributions.

 Configure Qpid

Use these options to configure the Qpid messaging system for OpenStack Oslo RPC. Qpid is not the default messaging system, so you must enable it by setting the rpc_backend option in the nova.conf file.


This critical option points the compute nodes to the Qpid broker (server). Set qpid_hostname to the host name where the broker runs in the nova.conf file.


The --qpid_hostname option accepts a host name or IP address value.

If the Qpid broker listens on a port other than the AMQP default of 5672, you must set the qpid_port option to that value:


If you configure the Qpid broker to require authentication, you must add a user name and password to the configuration:


By default, TCP is used as the transport. To enable SSL, set the qpid_protocol option:


This table lists additional options that you use to configure the Qpid messaging driver for OpenStack Oslo RPC. These options are used infrequently.

Table 2.3. Description of configuration options for qpid
Configuration option = Default value Description
qpid_heartbeat = 60 (IntOpt) Seconds between connection keepalive heartbeats.
qpid_hostname = localhost (StrOpt) Qpid broker hostname.
qpid_hosts = $qpid_hostname:$qpid_port (ListOpt) Qpid HA cluster host:port pairs.
qpid_password = (StrOpt) Password for Qpid connection.
qpid_port = 5672 (IntOpt) Qpid broker port.
qpid_protocol = tcp (StrOpt) Transport to use, either 'tcp' or 'ssl'.
qpid_sasl_mechanisms = (StrOpt) Space separated list of SASL mechanisms to use for auth.
qpid_tcp_nodelay = True (BoolOpt) Whether to disable the Nagle algorithm.
qpid_topology_version = 1 (IntOpt) The qpid topology version to use. Version 1 is what was originally used by impl_qpid. Version 2 includes some backwards-incompatible changes that allow broker federation to work. Users should update to version 2 when they are able to take everything down, as it requires a clean break.
qpid_username = (StrOpt) Username for Qpid connection.

 Configure ZeroMQ

Use these options to configure the ZeroMQ messaging system for OpenStack Oslo RPC. ZeroMQ is not the default messaging system, so you must enable it by setting the rpc_backend option in the nova.conf file.

Table 2.4. Description of configuration options for zeromq
Configuration option = Default value Description
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_contexts = 1 (IntOpt) Number of ZeroMQ contexts, defaults to 1.
rpc_zmq_host = oslo (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 = oslo.messaging._drivers.matchmaker.MatchMakerLocalhost (StrOpt) MatchMaker driver.
rpc_zmq_port = 9501 (IntOpt) ZeroMQ receiver listening port.
rpc_zmq_topic_backlog = None (IntOpt) Maximum number of ingress messages to locally buffer per topic. Default is unlimited.

 Configure messaging

Use these options to configure the RabbitMQ and Qpid messaging drivers.

Table 2.5. Description of configuration options for rpc
Configuration option = Default value Description
amqp_auto_delete = False (BoolOpt) Auto-delete queues in amqp.
amqp_durable_queues = False (BoolOpt) Use durable queues in amqp.
control_exchange = openstack (StrOpt) The default exchange under which topics are scoped. May be overridden by an exchange name specified in the transport_url option.
matchmaker_heartbeat_freq = 300 (IntOpt) Heartbeat frequency.
matchmaker_heartbeat_ttl = 600 (IntOpt) Heartbeat time-to-live.
rpc_backend = rabbit (StrOpt) The messaging driver to use, defaults to rabbit. Other drivers include qpid and zmq.
rpc_cast_timeout = 30 (IntOpt) Seconds to wait before a cast expires (TTL). Only supported by impl_zmq.
rpc_conn_pool_size = 30 (IntOpt) Size of RPC connection pool.
rpc_response_timeout = 60 (IntOpt) Seconds to wait for a response from a call.
rpc_thread_pool_size = 64 (IntOpt) Size of RPC greenthread pool.
rpc_driver_queue_base = cells.intercell (StrOpt) Base queue name to use when communicating between cells. Various topics by message type will be appended to this.
ringfile = /etc/oslo/matchmaker_ring.json (StrOpt) Matchmaker ring file (JSON).
baseapi = None (StrOpt) Set a version cap for messages sent to the base api in any service

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