CHG0077502 CITZ MCS GOLD - Move app-16 to a new rack
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Node is back in service
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Node is back in service
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Change has been completed and the Calgary clusters are back online.
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The migration to OVN is now complete.
Previously reported connectivity issues between pods have all been resolved.
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The current Container Network Interface (CNI) called OpenShift SDN is deprecated and not available in the next version of OpenShift. We need to move to OVNKubernetes CNI to unlock the upgrade path to OpenShift 4.18.
The upgrade requires a rolling restart of all nodes in the cluster twice. API nodes and Infra nodes are highly available and will fail over services as needed.
As the node drains are managed by OpenShift operator automation, Platform Ops has no way to control the speed of drains.
We may continue to see slow or delayed storage operations like mounting PVCs to pods. Pods drained from one node onto another node may see up to 45 min delay until it starts. The best solution is to have multiple replicas so that a single pod failing to start does not cause application downtime.
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Migration to OVN completed successfully.
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