openstack/openstack-manuals
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Merge "[admin-guide] Remove ZooKeeper ServiceGroup driver"

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Jenkins 2017-04-12 16:27:56 +00:00 committed by Gerrit Code Review
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doc/admin-guide/source/compute-service-groups.rst

@ -38,47 +38,6 @@ The database contains data that is both transient (such as whether the
node is alive) and persistent (such as entries for VM owners). With the
ServiceGroup abstraction, Compute can treat each type separately.
.. _zookeeper-servicegroup-driver:
ZooKeeper ServiceGroup driver
-----------------------------
The ZooKeeper ServiceGroup driver works by using ZooKeeper ephemeral
nodes. ZooKeeper, unlike databases, is a distributed system, with its
load divided among several servers. On a compute worker node, the driver
can establish a ZooKeeper session, then create an ephemeral znode in the
group directory. Ephemeral znodes have the same lifespan as the session.
If the worker node or the nova-compute daemon crashes, or a network
partition is in place between the worker and the ZooKeeper server
quorums, the ephemeral znodes are removed automatically. The driver
can be given group membership by running the :command:`ls` command in the
group directory.
The ZooKeeper driver requires the ZooKeeper servers and client
libraries. Setting up ZooKeeper servers is outside the scope of this
guide (for more information, see `Apache Zookeeper <http://zookeeper.apache.org/>`_). These client-side
Python libraries must be installed on every compute node:
**python-zookeeper**
The official Zookeeper Python binding
**evzookeeper**
This library makes the binding work with the eventlet threading model.
This example assumes the ZooKeeper server addresses and ports are
``192.168.2.1:2181``, ``192.168.2.2:2181``, and ``192.168.2.3:2181``.
These values in the ``/etc/nova/nova.conf`` file are required on every
node for the ZooKeeper driver:
.. code-block:: ini
# Driver for the ServiceGroup service
servicegroup_driver="zk"
[zookeeper]
address="192.168.2.1:2181,192.168.2.2:2181,192.168.2.3:2181"
.. _memcache-servicegroup-driver:
Memcache ServiceGroup driver