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