Configuration for Qpid

This section discusses the configuration options that are relevant if Qpid is used as the messaging system for OpenStack Compute. Qpid is not the default messaging system, so it must be enabled by setting the rpc_backend option in nova.conf.

rpc_backend=nova.rpc.impl_qpid

This next critical option points the compute nodes to the Qpid broker (server). Set qpid_hostname in nova.conf to be the hostname where the broker is running.

	Note
	The -`-qpid_hostname` option accepts a value in the form of either a hostname or an IP address.

qpid_hostname=hostname.example.com

If the Qpid broker is listening on a port other than the AMQP default of 5672, you will need to set the qpid_port option:

qpid_port=12345

If you configure the Qpid broker to require authentication, you will need to add a username and password to the configuration:

qpid_username=username
qpid_password=password

By default, TCP is used as the transport. If you would like to enable SSL, set the qpid_protocol option:

qpid_protocol=ssl

The following table lists the rest of the options used by the Qpid messaging driver for OpenStack Compute. It is not common that these options are used.

Table 4.12. Remaining `nova.conf` configuration options for Qpid support
Configuration option	Default	Description
`qpid_sasl_mechanisms`	`(Qpid default)`	String value: A space separated list of acceptable SASL mechanisms to use for authentication.
`qpid_reconnect_timeout`	`(Qpid default)`	Integer value: The number of seconds to wait before deciding that a reconnect attempt has failed.
`qpid_reconnect_limit`	`(Qpid default)`	Integer value: The limit for the number of times to reconnect before considering the connection to be failed.
`qpid_reconnect_interval_min`	`(Qpid default)`	Integer value: Minimum number of seconds between connection attempts.
`qpid_reconnect_interval_max`	`(Qpid default)`	Integer value: Maximum number of seconds between connection attempts.
`qpid_reconnect_interval`	`(Qpid default)`	Integer value: Equivalent to setting `qpid_reconnect_interval_min` and `qpid_reconnect_interval_max` to the same value.
`qpid_heartbeat`	`5`	Integer value: Seconds between heartbeat messages sent to ensure that the connection is still alive.
`qpid_tcp_nodelay`	`True`	Boolean value: Disable the Nagle algorithm.

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