Open Stack

Hi all,

We are looking for the best way to process system upgrades on our
controller nodes and especially the best way to restart them (we have 3
controllers nodes with routers ha).
If we just restart them one by one (waiting long time between each), we
have already seen rabbitmq cluster errors (needing a complete restart of
rabbitmq).
With a kolla stop, a restart and a kolla deploy, some docker containers are
restarted on others nodes.

The administration guides describes how to add or remove a node but not
this simple case.
How do you proceed securely?

Thanks for all,
Yves
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