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Scenario #48
Cluster Management
K8s v1.23, bare metal
Resource Fragmentation Causing Cluster Instability
Resource fragmentation due to unbalanced pod distribution led to cluster instability.
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What Happened
Over time, pod distribution became uneven, with some nodes over-committed while others remained underutilized. This caused resource fragmentation, leading to cluster instability.
Diagnosis Steps
- 1Checked node resource utilization and found over-committed nodes with high pod density.
- 2Examined pod distribution and noticed skewed placement.
Root Cause
Lack of proper pod scheduling and resource management.
Fix/Workaround
• Applied pod affinity and anti-affinity rules to achieve balanced scheduling.
• Rescheduled pods manually to redistribute workload.Lessons Learned
Resource management and scheduling rules are crucial for maintaining cluster stability.
How to Avoid
- 1Use affinity and anti-affinity rules to control pod placement.
- 2Regularly monitor resource utilization and adjust pod placement strategies.