apiVersion: networking.istio.io/v1
kind: VirtualService
metadata:
  name: backend-canary
spec:
  hosts:
  - backend
  http:
  - route:
    - destination:
        host: backend
        subset: v1
      weight: 90
    - destination:
        host: backend
        subset: v2
      weight: 10

apiVersion: networking.istio.io/v1
kind: DestinationRule
metadata:
  name: backend-circuit-breaker
spec:
  host: backend
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 100
      http:
        http1MaxPendingRequests: 10
    outlierDetection:
      consecutiveErrors: 5
      interval: 30s
      baseEjectionTime: 30s

apiVersion: security.istio.io/v1
kind: PeerAuthentication
metadata:
  name: default
  namespace: istio-system
spec:
  mtls:
    mode: STRICT

apiVersion: security.istio.io/v1
kind: AuthorizationPolicy
metadata:
  name: allow-frontend
  namespace: production
spec:
  selector:
    matchLabels:
      app: backend
  action: ALLOW
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/production/sa/frontend
    to:
    - operation:
        methods: ["GET", "POST"]
        paths: ["/api/*"]

apiVersion: policy.linkerd.io/v1beta2
kind: HTTPRoute
metadata:
  name: backend-canary
spec:
  parentRefs:
  - name: backend
    kind: Service
  rules:
  - backendRefs:
    - name: backend-v1
      port: 8080
      weight: 90
    - name: backend-v2
      port: 8080
      weight: 10

apiVersion: linkerd.io/v1alpha2
kind: ServiceProfile
metadata:
  name: backend.production.svc.cluster.local
spec:
  routes:
  - name: GET /api/data
    condition:
      method: GET
      pathRegex: /api/data
    timeout: 3s
    retryBudget:
      retryRatio: 0.2
      minRetriesPerSecond: 10

apiVersion: policy.linkerd.io/v1alpha1
kind: AuthorizationPolicy
metadata:
  name: allow-frontend
spec:
  targetRef:
    kind: Server
    name: backend-api
  requiredAuthenticationRefs:
  - name: frontend-identity
    kind: MeshTLSAuthentication

apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: backend-access
spec:
  endpointSelector:
    matchLabels:
      app: backend
  ingress:
  - fromEndpoints:
    - matchLabels:
        app: frontend
    toPorts:
    - ports:
      - port: "8080"
      rules:
        http:
        - method: GET
          path: "/api/.*"

apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: external-api-access
spec:
  endpointSelector:
    matchLabels:
      app: backend
  egress:
  - toFQDNs:
    - matchName: "api.github.com"
    toPorts:
    - ports:
      - port: "443"

undefined

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apiVersion: flagger.app/v1beta1
kind: Canary
metadata:
  name: backend
spec:
  targetRef:
    kind: Deployment
    name: backend
  service:
    port: 8080
  analysis:
    interval: 1m
    threshold: 5
    maxWeight: 50
    stepWeight: 10
    metrics:
    - name: request-success-rate
      thresholdRange:
        min: 99

undefined

**Linkerd Multi-Cluster:**

```bash

For complete setup and cross-cluster patterns, see `references/multi-cluster.md`.

curl -L https://istio.io/downloadIstio | sh -
istioctl install --set profile=ambient -y
kubectl label namespace production istio.io/dataplane-mode=ambient

curl -sL https://run.linkerd.io/install-edge | sh
linkerd install --crds | kubectl apply -f -
linkerd install | kubectl apply -f -
kubectl annotate namespace production linkerd.io/inject=enabled

helm install cilium cilium/cilium \
  --namespace kube-system \
  --set meshMode=enabled \
  --set authentication.mutual.spire.enabled=true

undefined

undefined

undefined

For complete debugging guide and solutions, see `references/troubleshooting.md`.