Spotlight

When ETCD Crashes, Check Your Disks First: A Pod CrashLoopBack Debugging Story

Anastassios Nanos

This case study shows how etcd CrashLoopBack pods on a Karmada/k3s demo cluster turned out to be a ZFS I/O latency problem, and how four ZFS tuning settings fixed it — including the exact etcd Prometheus metrics to watch.

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Automating Pod Disruption Budgets with Kyverno
Automating Pod Disruption Budgets with Kyverno

Karpenter can reduce Kubernetes infrastructure costs, but aggressive node consolidation can also expose workloads that lack disruption safeguards.

Ahmad Asmar explains how Zencity uses Kyverno to automatically generate Pod Disruption Budgets, while accounting for existing PDBs, percentage-based availability targets, single-replica workloads, and environment-specific policies.

In this interview:

  • How Karpenter consolidation changes the availability risks of cluster operations
  • Why Kyverno's generated policies can provide safer defaults than manual enforcement
  • How to handle duplicate PDBs, scaling workloads, and single-replica edge cases
  • How aggregated ClusterRoles keep custom permissions separate from Helm-managed resources

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