Add documentation explaining how to use the AMQP 1.0 driver
Change-Id: I076ccff2b34be3ecf07cdcd0bb9753997c1e3218 Closes-Bug: #1367910
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Kenneth Giusti
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-------------------------
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AMQP 1.0 Protocol Support
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-------------------------
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.. currentmodule:: oslo.messaging
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============
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Introduction
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============
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This release of oslo.messaging includes an experimental driver that
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provides support for version 1.0 of the Advanced Message Queuing
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Protocol (AMQP 1.0, ISO/IEC 19464).
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The current implementation of this driver is considered
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*experimental*. It is not recommended that this driver be used in
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production systems. Rather, this driver is being provided as a
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*technical preview*, in hopes that it will encourage further testing
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by the AMQP 1.0 community.
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More detail regarding the driver's implementation is available from the `specification`_.
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.. _specification: https://git.openstack.org/cgit/openstack/oslo-specs/tree/specs/juno/amqp10-driver-implementation.rst
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=============
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Prerequisites
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=============
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This driver uses the Apache QPID `Proton`_ AMQP 1.0 protocol engine.
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This engine consists of a platform specific library and a python
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binding. The driver does not directly interface with the engine API,
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as the API is a very low-level interface to the AMQP protocol.
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Instead, the driver uses the pure python `Pyngus`_ client API, which
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is layered on top of the protocol engine.
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.. _Proton: http://qpid.apache.org/proton/index.html
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.. _Pyngus: https://github.com/kgiusti/pyngus
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In order to run the driver the Proton Python bindings, Proton
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library, Proton header files, and Pyngus must be installed.
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Pyngus is available via `Pypi`__.
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.. __: https://pypi.python.org/pypi/pyngus
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While the Proton Python bindings are available via `Pypi`__, it
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includes a C extension that requires the Proton library and header
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files be pre-installed in order for the binding to install properly.
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If the target platform's distribution provides a pre-packaged version
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of the Proton Python binding (see packages_ below), it is recommended
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to use these pre-built packages instead of pulling them from Pypi.
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.. __: https://pypi.python.org/pypi/python-qpid-proton
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The driver also requires a *broker* that supports version 1.0 of the
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AMQP protocol.
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The driver has only been tested using `qpidd`_ in a `patched
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devstack`_ environment. The version of qpidd **must** be at least
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0.26. qpidd also uses the Proton engine for its AMQP 1.0 support, so
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the Proton library must be installed on the system hosting the qpidd
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daemon.
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.. _qpidd: http://qpid.apache.org/components/cpp-broker/index.html
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.. _patched devstack: https://review.openstack.org/#/c/109118/
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At present, RabbitMQ does not work with this driver. This driver
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makes use of the *dynamic* flag on the link Source to automatically
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provision a node at the peer. RabbitMQ's AMQP 1.0 implementation has
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yet to implement this feature.
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See the `specification`_ for additional information regarding testing
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done on the driver.
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=============
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Configuration
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=============
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driver
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------
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It is recommended to start with the default configuration options
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supported by the driver. The remaining configuration steps described
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below assume that none of the driver's options have been manually
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overridden.
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**Note Well:** The driver currently does **not** support the generic
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*amqp* options used by the existing drivers, such as
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*amqp_durable_queues* or *amqp_auto_delete*. Support for these are
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TBD.
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qpidd
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-----
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First, verify that the Proton library has been installed and is
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imported by the qpidd broker. This can checked by running::
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$ qpidd --help
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and looking for the AMQP 1.0 options in the help text. If no AMQP 1.0
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options are listed, verify that the Proton libraries are installed and
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that the version of qpidd is greater than or equal to 0.26.
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Second, configure the address patterns used by the driver. This is
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done by adding the following to /etc/qpid/qpidd.conf::
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queue-patterns=exclusive
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queue-patterns=unicast
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topic-patterns=broadcast
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These patterns, *exclusive*, *unicast*, and *broadcast* are the
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default values used by the driver. These can be overridden via the
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driver configuration options if desired. If manually overridden,
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update the qpidd.conf values to match.
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services
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--------
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The new driver is selected by specifying **amqp** as the transport
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name. For example::
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from oslo import messaging
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from olso.config import cfg
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amqp_transport = messaging.get_transport(cfg.CONF,
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"amqp://me:passwd@host:5672")
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The new driver can be loaded and used by existing applications by
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specifying *amqp* as the RPC backend in the service's configuration
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file. For example, in nova.conf::
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rpc_backend = amqp
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.. _packages:
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======================
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Platforms and Packages
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======================
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Pyngus is available via Pypi.
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Pre-built packages for the Proton library and qpidd are available for
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some popular distributions:
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RHEL and Fedora
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---------------
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Packages exist in EPEL for RHEL/Centos 7, and Fedora 19+.
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Unfortunately, RHEL/Centos 6 base packages include a very old version
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of qpidd that does not support AMQP 1.0. EPEL's policy does not allow
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a newer version of qpidd for RHEL/Centos 6.
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The following packages must be installed on the system running the
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qpidd daemon:
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- qpid-cpp-server (version 0.26+)
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- qpid-proton-c
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The following packages must be installed on the systems running the
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services that use the new driver:
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- Proton libraries: qpid-proton-c-devel
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- Proton python bindings: python-qpid-proton
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- pyngus (via Pypi)
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Debian and Ubuntu
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-----------------
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Packages for the Proton library, headers, and Python bindings are
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available in the Debian/Testing repository. Proton packages are not
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yet available in the Ubuntu repository. The version of qpidd on both
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platforms is too old and does not support AMQP 1.0.
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Until the proper package version arrive the latest packages can be
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pulled from the `Apache Qpid PPA`_ on Launchpad::
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sudo add-apt-repository ppa:qpid/released
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.. _Apache Qpid PPA: https://launchpad.net/~qpid/+archive/ubuntu/released
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The following packages must be installed on the system running the
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qpidd daemon:
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- qpidd (version 0.26+)
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- libqpid-proton2
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The following packages must be installed on the systems running the
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services that use the new driver:
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- Proton libraries: libqpid-proton2-dev
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- Proton python bindings: python-qpid-proton
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- pyngus (via Pypi)
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@ -20,6 +20,7 @@ Contents
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exceptions
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opts
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conffixture
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AMQP1.0
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contributing
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Release Notes
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