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Question 58 of 60

Part 5: Production Scale, Deployment & Observability (51 - 60)

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Node.js & Libuv•Part 5: Production Scale, Deployment & Observability (51 - 60)

Zero-Downtime Deployments (Rolling vs Blue-Green).

In Simple Words:

  • Rolling Update: Kubernetes updates pods incrementally, waiting for readiness probes before terminating older pods.
  • Blue-Green: Provisions an entirely new green environment, verifies health, and switches traffic instantly at the load balancer level.
yaml
# Kubernetes RollingUpdate deployment spec:
strategy:
  type: RollingUpdate
  rollingUpdate:
    maxSurge: 1        # Max 1 extra pod during rollout
    maxUnavailable: 0  # 100% capacity maintained throughout update
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