On Fri, Aug 25, 2017 at 6:11 PM, Imtiaz Chowdhury <imtiaz.chowdh...@workday.com> wrote: > Hi Openstack operators, > > > > Most Openstack HA deployment use 3 node database cluster, 3 node rabbitMQ > cluster and 3 Controllers. I am wondering whether there are any studies done > that show the pros and cons of co-locating database and messaging service > with the Openstack control services. In other words, I am very interested > in learning about advantages and disadvantages, in terms of ease of > deployment, upgrade and overall API performance, of having 3 all-in-one > Openstack controller over a more distributed deployment model.
I'm not aware of any actual case studies, but this is the (current) default model for tripleo and its downstream product, so there would be a lot of deployments like this out there in the wild. In the default deployment everything but compute is on these 3 nodes running on the physical OS. Do you mean 3 physical servers with everything running on the physical OS? My opinion is that 3 physical nodes to run all the control plane services is quite common, but in custom deployments I either run vms and containers on those or just containers. I'd use at least lxc to segregate services into their own containers. I would also suggest that using those same physical servers as north/south "network nodes" (which you probably don't have as I believe workday is a big opencontrail user) or hosts for stateful metric systems (ie. mongodb) can cause issues performance wise, but co-located mysql/galera and rabbit on the same nodes as the rest of the openstack control plane hasn't been a problem for me yet, but with containers I could split them out fairly easily if needed. Thanks, Curtis. > > > > References to any work done in this area will be highly appreciated. > > > > Thanks, > Imtiaz > > > > > _______________________________________________ > OpenStack-operators mailing list > OpenStack-operators@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators > -- Blog: serverascode.com _______________________________________________ OpenStack-operators mailing list OpenStack-operators@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
