Kubernetes Cluster Issues: Multiple Pod Failures in test-problems Namespace

[himanshusharma89]

Kubernetes Cluster Debug Report

Summary

Multiple pods in the test-problems namespace are experiencing critical failures with different root causes. This report documents the issues found during cluster analysis.

Affected Pods

1. elasticsearch-test Pod

• Status: CrashLoopBackOff
• Restart Count: 179+
• Root Cause: Java/JVM cgroup detection failure
• Error: Cannot invoke "jdk.internal.platform.CgroupInfo.getMountPoint()" because "anyController" is null

Impact: High - Service completely unavailable
Fix Required: Add JVM arguments to handle cgroup compatibility

2. crash-loop-pod Pod

• Status: CrashLoopBackOff
• Restart Count: 164+
• Root Cause: Container exits immediately after start
• Image: busybox
• Resources: 100m CPU, 32Mi memory

Impact: Medium - Test workload failing
Fix Required: Add proper command/args to keep container running

3. bad-image-pod Pod

• Status: ImagePullBackOff
• Restart Count: 0
• Root Cause: Non-existent image reference
• Image: nonexistent/image:latest

Impact: Medium - Pod never starts
Fix Required: Correct image name or ensure image exists

Cluster Health Overview

• Nodes: 3/3 healthy ✅
• Total Pods: 20
• Failed Pods: 3 (15% failure rate)
• Affected Namespace: test-problems

Recommended Actions

Immediate Fixes

1. Elasticsearch Pod Fix:

   env:
   - name: ES_JAVA_OPTS
     value: "-Xms512m -Xmx512m -Dlog4j2.disable.jmx=true"

2. Crash Loop Pod Fix:

   command: ["/bin/sh"]
   args: ["-c", "while true; do sleep 30; done"]

3. Image Pull Fix:

   • Update image reference to valid image
   • Or use busybox:latest for testing

Long-term Recommendations

• Consider upgrading Elasticsearch to 8.x for better container compatibility
• Implement proper health checks for all test workloads
• Add resource limits and requests for all containers
• Set up monitoring for pod restart counts

Environment Details

• Cluster: Kubernetes
• Namespace: test-problems
• Analysis Date: 2025-05-29
• Issue Severity: Medium (test environment)

Next Steps

1. Apply fixes for critical pods
2. Monitor restart counts after fixes
3. Consider cleanup of test namespace if no longer needed
4. Implement alerting for pod failures

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Generated by automated cluster analysis tool