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Mirorring

Start 2 httpbin

Deployment httpbinv1

cat <<EOF | istioctl kube-inject -f - | kubectl create -f -
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: httpbin-v1
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: httpbin
        version: v1
    spec:
      containers:
      - image: docker.io/kennethreitz/httpbin
        imagePullPolicy: IfNotPresent
        name: httpbin
        command: ["gunicorn", "--access-logfile", "-", "-b", "0.0.0.0:8080", "httpbin:app"]
        ports:
        - containerPort: 8080
EOF

Deployment httpbinv2

cat <<EOF | istioctl kube-inject -f - | kubectl create -f -
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: httpbin-v2
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: httpbin
        version: v2
    spec:
      containers:
      - image: docker.io/kennethreitz/httpbin
        imagePullPolicy: IfNotPresent
        name: httpbin
        command: ["gunicorn", "--access-logfile", "-", "-b", "0.0.0.0:8080", "httpbin:app"]
        ports:
        - containerPort: 8080
EOF

Create httpbin service

cat <<EOF | kubectl create -f -
apiVersion: v1
kind: Service
metadata:
  name: httpbin
  labels:
    app: httpbin
spec:
  ports:
  - name: http
    port: 8080
  selector:
    app: httpbin
EOF

Create sleep service (curl to provide load)

cat <<EOF | istioctl kube-inject -f - | kubectl create -f -
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: sleep
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: sleep
    spec:
      containers:
      - name: sleep
        image: tutum/curl
        command: ["/bin/sleep","infinity"]
        imagePullPolicy: IfNotPresent
EOF

Create default route -> v1

cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpbin
spec:
  hosts:
    - httpbin
  http:
  - route:
    - destination:
        host: httpbin
        subset: v1
      weight: 100
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: httpbin
spec:
  host: httpbin
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v2
    labels:
      version: v2
EOF

All traffic should go to v1

export SLEEP_POD=$(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name})
kubectl exec -it $SLEEP_POD -c sleep -- sh -c 'curl  http://httpbin:8080/headers' | python -m json.tool
{
  "headers": {
    "Accept": "*/*",
    "Content-Length": "0",
    "Host": "httpbin:8080",
    "User-Agent": "curl/7.35.0",
    "X-B3-Sampled": "1",
    "X-B3-Spanid": "eca3d7ed8f2e6a0a",
    "X-B3-Traceid": "eca3d7ed8f2e6a0a",
    "X-Ot-Span-Context": "eca3d7ed8f2e6a0a;eca3d7ed8f2e6a0a;0000000000000000"
  }
}```

# Check logs for v1 and v2 pods
# Only traffic for v1 pod
```bash
export V1_POD=$(kubectl get pod -l app=httpbin,version=v1 -o jsonpath={.items..metadata.name})
kubectl logs -f $V1_POD -c httpbin
127.0.0.1 - - [07/Mar/2018:19:02:43 +0000] "GET /headers HTTP/1.1" 200 321 "-" "curl/7.35.0"
export V2_POD=$(kubectl get pod -l app=httpbin,version=v2 -o jsonpath={.items..metadata.name})
kubectl logs -f $V2_POD -c httpbin
<none>

Create route to mirror traffic to v2

cat <<EOF | kubectl apply -f -
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpbin
spec:
  hosts:
    - httpbin
  http:
  - route:
    - destination:
        host: httpbin
        subset: v1
      weight: 100
    mirror:
      host: httpbin
      subset: v2
EOF

Send traffic

kubectl exec -it $SLEEP_POD -c sleep -- sh -c 'curl  http://httpbin:8080/headers' | python -m json.tool

Check logs for v1 and v2

We should see traffic for v1 and v2

kubectl logs -f $V1_POD -c httpbin
127.0.0.1 - - [07/Mar/2018:19:02:43 +0000] "GET /headers HTTP/1.1" 200 321 "-" "curl/7.35.0"
127.0.0.1 - - [07/Mar/2018:19:26:44 +0000] "GET /headers HTTP/1.1" 200 321 "-" "curl/7.35.0"
kubectl logs -f $V2_POD -c httpbin
127.0.0.1 - - [07/Mar/2018:19:26:44 +0000] "GET /headers HTTP/1.1" 200 361 "-" "curl/7.35.0"

Cleanup

kubectl delete virtualservice httpbin
kubectl delete destinationrule httpbin
kubectl delete deploy httpbin-v1 httpbin-v2 sleep
kubectl delete svc httpbin