Kubernetes PodDisruptionBudget (PDB)
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- https://kubernetes.io/docs/concepts/workloads/pods/disruptions/#pod-disruption-budgets
- 1.4 Alpha, K8s v1.21 April 2021 GA, Eviction subresource 1.22
- https://github.com/kubernetes/enhancements/issues/85
- https://github.com/kubernetes/enhancements/tree/master/keps/sig-apps/85-Graduate-PDB-to-Stable
- https://kubernetes.io/docs/tasks/run-application/configure-pdb/
Contents
Commands[edit]
kubectl api-resources | grep -i pdb poddisruptionbudgets pdb policy/v1 true PodDisruptionBudget
33m Warning CalculateExpectedPodCountFailed poddisruptionbudget/xxxx-pdb Failed to calculate the number of expected pods: statefulsets.apps does not implement the scale subresource
kind: PodDisruptionBudget
55m Normal NoPods poddisruptionbudget/your_text No matching pods found
Test[edit]
kubectl drain ip-10-0-3-48.us-east-2.compute.internal --ignore-daemonsets error when evicting pods/"your-pod-name" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget
Examples[edit]
apiVersion: policy/v1 kind: PodDisruptionBudget metadata: name: zk-pdb spec: minAvailable: 2 selector: matchLabels: app: zookeeper
Related[edit]
maxUnavailable
NoPods
- Disruptions
- Karpenter
spec.replicas
- Eviction API
- 1.21 Graceful node shutdown
kubectl drain
kubectl drain your-node-name --ignore-daemonsets
- TopologySpreadConstraints
ttlSecondsUntilExpired
kubernetes_pod_disruption_budget_v1
Cannot disrupt Node
Cannot disrupt NodeClaim
See also[edit]
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