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ENGINEERING TOOL

Kubernetes PDB Eviction Safety Calculator

Sanity-check a planned node-drain wave against an integer minAvailable or maxUnavailable budget before changing production nodes.

What this tool helps you estimate

Estimate how many voluntary pod evictions fit an absolute PodDisruptionBudget before a node drain, using desired replicas and current healthy replicas.

  • PodDisruptionBudget
  • AKS node upgrades
  • Voluntary pod eviction
  • Replica availability

The interactive calculation runs in your browser. Treat the output as an estimate, document assumptions, and validate them against service telemetry and operational evidence before making production decisions.

Use this with the AKS production upgrade preflight checklist and the full AKS production-readiness guide.

For workload headroom, use the System Design Capacity Calculator and review the network capacity planning guide.

For change success criteria, read the SLO error-budget planning guide.