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Blue/Green Rollout — Sessions and Capacity

Guidance (from architecture docs)

  • Use sessionAffinity: ClientIP and a PodDisruptionBudget to avoid dropping sticky sessions.
  • Set conservative resource requests/limits; run 2+ replicas; roll with maxUnavailable=1.

K8s snippets

strategy:
  type: RollingUpdate
  rollingUpdate:
    maxUnavailable: 1
    maxSurge: 1
---
apiVersion: policy/v1
kind: PodDisruptionBudget
spec:
  minAvailable: 2