So, I'm running OpenShift 4.2 on Azure UPI following this blog article: https://blog.openshift.com/openshift-4-1-upi-environment-deployment-on-microsoft-azure-cloud/ with a few customisations on the terraform side.
One of the main differences it seems, is how the router/ingress is handled. Normal Azure uses load balancers, but UPI Azure uses a regular router (that I'm used to seeing the 3.x version) which is configured by setting the "HostNetwork" for the endpoint publishing strategy <https://github.com/JuozasA/ocp4-azure-upi/blob/master/ingresscontroller-default.yaml#L9-L10> It was all working fine in OpenShift 4.2.0 and 4.2.2, but when I upgraded to OpenShift 4.2.4, the router stopped listening on ports 80 and 443, I could see the pod running with "crictl ps", but a "netstat -tpln" didn't show anything listening. I tried updating the version back from 4.2.4 to 4.2.2, but I accidentally used 4.1.22 image digest value, so I quickly reverted back to 4.2.4 once I saw the apiservers coming up as 4.1.22. I then noticed that there was a 4.2.7 release on the candidate-4.2 channel, so I switched to that, and ingress started working properly again. So my question is, what is the strategy for recovering from a failed update? Do I need to have etcd backups and then restore the cluster by restoring etcd? Ie. https://docs.openshift.com/container-platform/4.2/backup_and_restore/disaster_recovery/scenario-2-restoring-cluster-state.html The upgrade page <https://docs.openshift.com/container-platform/4.2/updating/updating-cluster-between-minor.html> specifically says "Reverting your cluster to a previous version, or a rollback, is not supported. Only upgrading to a newer version is supported." so is it an expectation for a production cluster that you would restore from backup if the cluster isn't usable? Maybe the upgrade page should mention taking backups? Especially if there is no rollback option.
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