For a client I automated the patching process of Linux operating systems and middleware. I create a python action for that in StackStorm. The script retrieved all servers from the CMDB and patched per data center.
All non cluster hosts where patched in parallel with the Python ParallelSSHClient.
For hosts in a cluster it’s a bit harder. The minimum amount of nodes in a cluster is most of the time 3 and only one node can be down without downtime of the cluster. So a rolling upgrade is More >
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