Autoscaler Misconfigured with Cluster Network Constraints

The Cluster Autoscaler failed to scale due to network configuration constraints that prevented communication between nodes.

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What Happened

Cluster Autoscaler tried to add new nodes, but network constraints in the cluster configuration prevented nodes from communicating, causing scaling to fail.

Diagnosis Steps

1Checked network logs and found that new nodes could not communicate with the existing cluster.
2Found that the network policy or firewall rules were blocking traffic to new nodes.

Root Cause

Misconfigured network policies or firewall rules preventing new nodes from joining the cluster.

Fix/Workaround

• Adjusted network policies and firewall rules to allow communication between new and existing nodes.
• Configured the autoscaler to take network constraints into account during scaling events.

Lessons Learned

Network constraints can block scaling operations, especially when adding new nodes.

How to Avoid

1Test and review network policies and firewall rules periodically to ensure new nodes can be integrated into the cluster.
2Ensure that scaling operations account for network constraints.

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