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.
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.
rpc_backend=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.openstack.common.notifier.rpc_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.
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
| 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. |
| 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. |
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.
rpc_backend=nova.openstack.common.rpc.impl_qpid
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.
![[Note]](../common/images/admon/note.png) | Note |
|---|---|
The |
qpid_hostname=hostname.example.com
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:
qpid_port=12345
If you configure the Qpid broker to require authentication, you must add a user name and password to the configuration:
qpid_username=username qpid_password=password
By default, TCP is used as the transport. To enable SSL, set
the qpid_protocol option:
qpid_protocol=ssl
This table lists additional options that you use to configure the Qpid messaging driver for OpenStack Oslo RPC. These options are used infrequently.
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
| 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_receiver_capacity = 1 | (IntOpt) The number of prefetched messages held by receiver. |
| 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. |
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.
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
| 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 = 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 = 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. |
Use these options to configure the RabbitMQ and Qpid messaging drivers.
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
| 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. |
| default_publisher_id = None | (StrOpt) Default publisher_id for outgoing notifications |
| notification_driver = [] | (MultiStrOpt) Driver or drivers to handle sending notifications. |
| notification_topics = notifications | (ListOpt) AMQP topic used for OpenStack notifications. |
| transport_url = None | (StrOpt) A URL representing the messaging driver to use and its full configuration. If not set, we fall back to the rpc_backend option and driver specific configuration. |
| Configuration option = Default value | Description |
|---|---|
| [DEFAULT] | |
| 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. |
| [cells] | |
| 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. |
| [upgrade_levels] | |
| baseapi = None | (StrOpt) Set a version cap for messages sent to the base api in any service |
