openstack/fuel-specs
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Merge "Blueprint: ceilometer-central-agent-ha"

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This work is licensed under a Creative Commons Attribution 3.0 Unported
License.
http://creativecommons.org/licenses/by/3.0/legalcode
==============================================
Add central agent HA and workload partitioning
==============================================
https://blueprints.launchpad.net/fuel/+spec/ceilometer-central-agent-ha
Implement Redis installation and using it as a coordination backend
for ceilometer central agents
Problem description
===================
A detailed description of the problem:
* Currentrly ceilometer central agent is the only one ceilometer component
that didn't support HA and workload partitioning. During Juno release
cycle this feature was intorduced to the ceilometer in the upstream code
using tooz coordination openstack library. This library supports several
backends (zookeeper, redis, memcached among them). It was decided
to introduce this built-in ceilometer feature to MOS as well.
Redis was chosen as the coordination backend.
Proposed change
===============
This feature is experimental and should be implemented as fuel-plugin.
It's implementation requires following things to be done:
* Implement Redis installation on controller nodes only in HA mode
* Prepare Redis packages and it's dependencies
* Configure ceilometer central agents to work with redis
Installation diagram is as follows
::
+---------------------+
| |
| +---------------+ |
| | ceilometer +-------------------------+
| | central agent | | |
| +---------------+ | |
| | |
| Primary controller | |
| | |
| +---------------+ | |
| | redis <------------------------------+
| | master | | | |
| +---------------+ | | |
| | | |
+---------------------+ | |
| |
+---------------------+ | |
| | | |
| +---------------+ | | |
| | ceilometer +-------------------------+ |
| | central agent | | | |
| +---------------+ | | |
| | +------v----+--+
| controller 1 | | |
| | | Coordination |
| +---------------+ | | |
| | redis | | +------^----+--+
| | slave1 | | | |
| | <------------------------------+
| +---------------+ | | |
| | | |
+---------------------+ | |
| |
+---------------------+ | |
| | | |
| +---------------+ | | |
| | ceilometer +-------------------------+ |
| | central agent | | |
| +---------------+ | |
| | |
| controller 2 | |
| | |
| +---------------+ | |
| | redis | | |
| | slave2 <------------------------------+
| | | |
| +---------------+ |
| |
+---------------------+
Alternatives
------------
This feature could be implemented by default, but it has experimental status.
Data model impact
-----------------
None
REST API impact
---------------
None
Upgrade impact
--------------
These changes will be needed in puppet scripts:
* Add redis module
* Configure ceilometer central agent to use redis as backend
This change will be needed in packages:
* Use upstream Redis packages and it's dependencies
Security impact
---------------
None
Notifications impact
--------------------
None
Other end user impact
---------------------
None
Performance Impact
------------------
None
Other deployer impact
---------------------
This could be installed only in HA mode with ceilometer
Developer impact
----------------
None
Implementation
==============
Assignee(s)
-----------
Primary assignee:
Ivan Berezovskiy
Other contributors:
Dina Belova
Reviewer:
Vladimir Kuklin Sergii Golovatiuk
QA:
Vadim Rovachev
Work Items
----------
* Implement redis installation from puppet (iberezovskiy)
* Configure ceilometer central agent (iberezovskiy)
* Write a documentation (dbelova)
Dependencies
============
None
Testing
=======
Testing approach:
* Environment with ceilometer in HA mode should be succesfully deployed
* Ceilometer should collect all enabled polling meters for deployed
environment
* Polling meters should be divided on groups by ceilometer central agents
* Redis cluster should be with one master and two slaves
* Ensure that after one central agent was broken, during the next polling
cycle all measurements will be rescheduled between two another,
and still all of them will be collected
* Ensure that after node with redis master was broken ceilometer central
agents can work with new redis master and can poll meters
Documentation Impact
====================
A note should be added about redis plugin installation and
how ceilometer agent can work in HA mode
References
==========
None