Node Failure During Pod Scaling Up

Scaling up pods failed when a node was unexpectedly terminated, preventing proper pod scheduling.

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What Happened

During an autoscaling event, a node was unexpectedly terminated due to cloud infrastructure issues. This caused new pods to fail scheduling as no available node had sufficient resources.

Diagnosis Steps

1Checked the node status and found that the node had been terminated by AWS.
2Observed that there were no available nodes with the required resources for new pods.

Root Cause

Unexpected node failure during the scaling process.

Fix/Workaround

• Configured the Cluster Autoscaler to provision more nodes and preemptively account for potential node failures.
• Ensured the cloud provider's infrastructure health was regularly monitored.

Lessons Learned

Autoscaling should anticipate infrastructure issues such as node failure to avoid disruptions.

How to Avoid

1Set up proactive monitoring for cloud infrastructure and integrate with Kubernetes scaling mechanisms.
2Ensure Cluster Autoscaler is tuned to handle unexpected node failures quickly.

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