Terraform Canary Deployment Guide 2026

Infrastructure as Code

Terraform Canary Deployment 2026

Zero-Downtime Infrastructure Deployments mit Terraform. Canary, Blue-Green, automatisches Rollback und Observability für sichere Produktions-Updates.

Deployment-Strategien

Canary

Progressiver Rollout: 5% → 25% → 50% → 100%. Frühe Fehlererkennung bei minimaler Impact.

Blue-Green

Zwei identische Umgebungen. Instant-Switch mit sofortigem Rollback.

Terraform Implementierung

AWS ALB mit Weighted Routing

# Terraform: Canary Traffic Splitting
resource "aws_lb_target_group" "blue" {
  name     = "blue-tg"
  port     = 80
  protocol = "HTTP"
  vpc_id   = aws_vpc.main.id
}

resource "aws_lb_target_group" "green" {
  name     = "green-tg"
  port     = 80
  protocol = "HTTP"
  vpc_id   = aws_vpc.main.id
}

# Weighted Routing (80% Blue, 20% Green)
resource "aws_lb_listener_rule" "canary" {
  listener_arn = aws_lb_listener.https.arn
  priority     = 100

  action {
    type = "forward"
    forward {
      target_group {
        arn    = aws_lb_target_group.blue.arn
        weight = 80
      }
      target_group {
        arn    = aws_lb_target_group.green.arn
        weight = 20
      }
    }
  }
}

Health Checks & Auto-Rollback

• HTTP Health Probes: 200 OK vor Traffic-Shift
• Error Rate Monitoring: Rollback bei > 0.1% 5xx Errors
• Latency Gates: p99 Latenz < 500ms
• Prometheus Metrics: Business KPIs als Gates

Argo Rollouts Integration

# Argo Rollout: Progressive Delivery
apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  name: my-app
spec:
  replicas: 10
  strategy:
    canary:
      steps:
      - setWeight: 10
      - pause: {duration: 2m}
      - setWeight: 25
      - pause: {duration: 5m}
      - analysis:
          templates:
          - templateName: success-rate
      - setWeight: 50
      - pause: {duration: 10m}
      - setWeight: 100