[Openstack-operators] minimum scale openstack

Abel Lopez alopgeek at gmail.com
Wed Jun 18 22:34:49 UTC 2014


You can do Active/Active DB with a load balanced VIP, but that’s beyond the scope of “minimum scale”

On Jun 18, 2014, at 2:30 PM, Clint Byrum <clint at fewbar.com> wrote:

> Excerpts from Alex Leonhardt's message of 2014-06-18 13:51:41 -0700:
>> hi guys,
>> 
>> am looking for some resource which parts of the system are required to be
>> HA - I naturally would do  :
>> 
>> - DB
>> - Rabbit
>> - Controller node/s
>> 
>> we dont use glance and swift too much and wont really as I'd use it as a
>> private / internal cloud - what other services would you consider needing
>> HA and if so, is it possible to run Active/Active with the DB and Rabbit at
>> least ?
>> 
> 
> Active/Active DB would need to be done using a sync replication system
> like MySQL cluster or Galera. These both recommend more than 2 nodes.
> Also there are likely issues with the way OpenStack handles conflicting
> commits to the database, so Active/Active may not even be possible
> without a lot of testing.
> 
> RabbitMQ can be run in Active/Active w/ mirrored queues.
> 
> Both of the above would require some kind of STONITH mechanism to be
> sure that split-brain doesn't corrupt your data.
> 
> All of the OpenStack controller services should be O-K except two that
> I know of:
> 
> * Ceilometer's collector must be Active/Passive
> * Neutron L3 agent needs to be Active/Passive unless patches have landed
>  to change that
> 
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