Blue-green deployment pattern with parallel environment setup, smoke testing, load balancer traffic switch, and instant rollback capability.

Full FlowZap Code

CI { # CI Pipeline
n1: circle label:"Start"
n2: rectangle label:"Build new version"
n3: rectangle label:"Run automated tests"
n4: rectangle label:"Verify deployment success"
n5: circle label:"End"
n1.handle(right) -> n2.handle(left)
n2.handle(right) -> n3.handle(left)
n3.handle(bottom) -> BlueGreen.n6.handle(top) [label="Deploy"]
n4.handle(right) -> n5.handle(left)
}
BlueGreen { # Blue-Green Controller
n6: rectangle label:"Identify current environment"
n7: diamond label:"Current active?"
n8: rectangle label:"Deploy to Green"
n9: rectangle label:"Deploy to Blue"
n10: rectangle label:"Run smoke tests"
n11: diamond label:"Tests passed?"
n12: rectangle label:"Switch load balancer"
n13: rectangle label:"Rollback deployment"
n6.handle(right) -> n7.handle(left)
n7.handle(right) -> n8.handle(left) [label="Blue"]
n7.handle(bottom) -> n9.handle(top) [label="Green"]
n8.handle(right) -> n10.handle(left)
n9.handle(right) -> n10.handle(top)
n10.handle(right) -> n11.handle(left)
n11.handle(right) -> n12.handle(left) [label="Yes"]
n11.handle(bottom) -> n13.handle(top) [label="No"]
n12.handle(bottom) -> LoadBalancer.n14.handle(top) [label="Switch"]
n13.handle(top) -> CI.n4.handle(bottom) [label="Failed"]
}
LoadBalancer { # Load Balancer
n14: rectangle label:"Update target group"
n15: rectangle label:"Drain old connections"
n16: rectangle label:"Route traffic to new env"
n17: rectangle label:"Monitor error rates"
n18: diamond label:"Stable?"
n19: rectangle label:"Mark deployment complete"
n20: rectangle label:"Revert to old environment"
n14.handle(right) -> n15.handle(left)
n15.handle(right) -> n16.handle(left)
n16.handle(right) -> n17.handle(left)
n17.handle(right) -> n18.handle(left)
n18.handle(right) -> n19.handle(left) [label="Yes"]
n18.handle(bottom) -> n20.handle(top) [label="No"]
n19.handle(top) -> CI.n4.handle(bottom) [label="Success"]
n20.handle(top) -> CI.n4.handle(bottom) [label="Rolled back"]
}

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