Last Modified: Aug 21, 2022
Opened: Jun 14, 2022
The local etcd instance on a system controller may be unreachable after a rolling upgrade. This can be seen via the output of /etc/etcd/dump_etcd.sh script on the controller.
The local etcd instance will become unreachable. If the local instance on the active controller is unreachable, and the standby controller fails, etcd and the openshift cluster will go offline.
This can happen during a rolling upgrade.
The unreachable etcd instance will be restored once the rolling update is completed.