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Scenario #158
Networking
K8s v1.20, Azure AKS
CoreDNS Service Failures Due to Resource Exhaustion
CoreDNS service failed due to resource exhaustion, causing DNS resolution failures.
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What Happened
CoreDNS pods exhausted available CPU and memory, leading to service failures and DNS resolution issues.
Diagnosis Steps
- 1Checked CoreDNS logs and found out-of-memory errors.
- 2Verified that the CPU usage was consistently high for the CoreDNS pods.
Root Cause
Insufficient resources allocated to CoreDNS pods, causing service crashes.
Fix/Workaround
• Increased the resource requests and limits for CoreDNS pods.
• Restarted the CoreDNS pods to apply the updated resource allocation.Lessons Learned
Ensure that critical components like CoreDNS have sufficient resources allocated for normal operation.
How to Avoid
- 1Set appropriate resource requests and limits based on usage patterns.
- 2Monitor resource consumption of CoreDNS and other critical components.