BZ #1180158: Ceilometer workload partitioning with tooz & redis #449
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Capturing some relevant discussion from IRC ... |
https://bugzilla.redhat.com/show_bug.cgi?id=1180158 The quickstack::pacemaker:ceilometer puppet class now allows redis to be specified as the backend for tooz, to be used for workload partitioning in the ceilometer central agent and alarm evaluator. We do not create a pacemaker resource for redis, as this will instead be self-monitored via the redis-sentinel service (via a subsequent patch, once the support for sentinel in tooz is packaged python-tooz).
https://bugzilla.redhat.com/show_bug.cgi?id=1180158 We use redis-sentinel to monitor the redis instances running on controller nodes, and to detect when mastership needs to be failed over to a slave. The sentinel cluster has a default quorum of 2, so can survive the loss of one controller on a minimally sized HA controller plane. The ceilometer backend_url contains a list of fallback sentinels, similar in style to the mongodb connect URL, except that the additional addresses are specified as query parameters.
| $memcached_port = '11211', | ||
| $db_port = '27017', | ||
| $verbose = 'false', | ||
| $coordination_backend = 'redis', |
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Super minor nit - could you put these new params in alphabetical order? I think it is easier to find things that way
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Minor nit aside, is this ready for me to test against release repos? If so, and we have all needed acks, we can try to include it tomorrow |
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@jguiditta: to be fully functional, the second commit of this pull request requires new builds of openstack-puppet-modules and python-tooz. After discussions around the o-p-m rebuild yesterday, it was decided by eng mgmt not to incur the risk of rebuilding o-p-m prior to the OSP6 release candidate. The first commit on the other hand, should work against the release repos, as it does not install sentinel (the aspect for which the new build of o-p-m would be required). From our discussion on the original pull-request, I suspect that you may be leery of only including the basic redis support without sentinel in OSP6. However if that kind of incremental approach is indeed a runner, I could recreate the pull request with only the initial commit. |
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Closing this, as the functionality is included in #506 |
https://bugzilla.redhat.com/show_bug.cgi?id=1180158
The quickstack::pacemaker:ceilometer puppet class now allows
redis to be specified as the backend for tooz, to be used for
workload partitioning in the ceilometer central agent and
alarm evaluator.
We do not create a pacemaker resource for redis, as this will
instead be self-monitored via the redis-sentinel service (via
a subsequent patch, once the support for sentinel in tooz is
packaged python-tooz).