<div dir="ltr"><div><div style="font-size:12.8px">Hey OpenStack Charmers,</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">We have a Newton deployment on MAAS with 3 controller machines running all the usual OpenStack controller services in 3x HA with the hacluster charm in LXD containers. Now we'd like migrate some of those OpenStack services to 3 larger controller machines. Downtime of the services during the migration is not an issue.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">My current plan is test something like this: </div><div style="font-size:12.8px">* Add the new controller machines to the model</div><div style="font-size:12.8px">* Increase the cluster_count from 3 to 6 on the hacluster charm of the services in question</div><div style="font-size:12.8px">* Add units to the service to LXD containers on the new controller machine<br></div><div style="font-size:12.8px">* Wait for things to deploy and cluster</div><div style="font-size:12.8px">* Decrease the cluster_count from 6 to 3</div><div style="font-size:12.8px">* Remove units on the old controller</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Questions:</div><div style="font-size:12.8px">1. Is there a preferred way to migrate OpenStack services deployed by charms?</div><div style="font-size:12.8px">2. Does the plan above look somewhat sane?</div><div style="font-size:12.8px">3. If yes to the above, does the order of changing the cluster_count and adding/removing units matter? I've seen this bug for example: <a href="https://bugs.launchpad.net/charm-hacluster/+bug/1424048" target="_blank">https://bugs.<wbr>launchpad.net/charm-hacluster/<wbr>+bug/1424048</a></div><div style="font-size:12.8px">4. Anything to keep in mind for scaling up and down the rabbitmq and percona clusters?</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Cheers</div></div><br clear="all"><div><div class="gmail_signature"><div>--</div>Sandor Zeestraten</div></div>
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