How do Traffic Policies work in Service Mesh?

Question

Accepted Answer

**Traffic Policies** — traffic management rules.

**1. Traffic Splitting:**
```yaml
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
spec:
  hosts: [myapp]
  http:
    - route:
        - destination:
            host: myapp
            subset: v1
          weight: 80
        - destination:
            host: myapp
            subset: v2
          weight: 20
```

**2. Retries and Timeouts:**
```yaml
spec:
  hosts: [myapp]
  http:
    - timeout: 10s
      retries:
        attempts: 3
        perTryTimeout: 2s
        retryOn: 5xx,reset,connect-failure
```

**3. Circuit Breaking:**
```yaml
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
spec:
  host: myapp
  trafficPolicy:
    outlierDetection:
      consecutive5xxErrors: 5
      interval: 30s
      baseEjectionTime: 30s
```

**4. Fault Injection:**
```yaml
spec:
  http:
    - fault:
        delay:
          percentage:
            value: 10
          fixedDelay: 5s
        abort:
          percentage:
            value: 5
          httpStatus: 503
```

**5. Header-based Routing:** match headers → route to subset.

DevOps: How do Traffic Policies work in Service Mesh?