Software Design

Blue-Green Deployment Zero-Downtime Traffic Switch

UML Sequence Diagrams · made in Skemio

UML sequence diagram illustrating client requests shifting from Blue instances to Green instances via a load balancer after passing synthetic health checks.
UML sequence diagram illustrating client requests shifting from Blue instances to Green instances via a load balancer after passing synthetic health checks.
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What it shows

  • Warm up Green instances fully before introducing production traffic.
  • Switch router weights instantly to make rollback a one-click operation.
  • Allow connection draining on Blue to finish active in-flight requests.

The takeaway

Blue-Green deployments eliminate downtime by pre-warming identical hardware and switching pointers instantly.

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