I’m planning to upgrade a Openshift Origin 3.6 cluster to 3.9, which has 3 masters, 3 etcd, 2 infra nodes and 8 nodes for common use. It’s not possible to just run the upgrade yaml, cause it will take A LOT of time. I’d like to know if it’s possible that I can do the upgrade like this:
1. Update control plane to 3.7 at night, after the upgrade, let it run as is 2. Update nodes to 3.7 through 2 or more nights, to reduce cluster down time 3. Repeat step1&2 to upgrade to 3.9 I didn’t find any mention on the official docs that clears if master and node of different version (eg. Masters of v3.7 and nodes of v3.6) could co-exist, and also for nodes of different versions(eg. Nodes of v3.6 and Nodes of v3.7) Thanks.
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