Hello, if you are working on a migration to Kolla, there is a nice guide written by StackHPC that provides one example approach for this complicated maneuver: https://www.stackhpc.com/migrating-to-kolla.html Perhaps not relevant to your specific case, but it can offer some guidance! Cheers, /Jason On Aug 21, 2020, at 3:19 PM, Fabian Zimmermann <dev.faz@gmail.com<mailto:dev.faz@gmail.com>> wrote: Hi, seems like someone else is trying to migrate an existing setup to kolla 😉 We currently try it step by step. 1. Use kolla images instead of self developed builder. 2. Generate suitable kolla configuration file layout 3. Hopefully kolla-ansible will hand over But we are still in PoC state. Fabian Tony Liu <tonyliu0592@hotmail.com<mailto:tonyliu0592@hotmail.com>> schrieb am Fr., 21. Aug. 2020, 20:49: Hi, I wonder if it's supported by Kolla Ansible to deploy a specific host and add it into existing cluster, like replace a control host or compute host? Thanks! Tony