A short, simple Istio traffic splitting demo.

httpy.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: httpy-files
data:
  server.py: |
    import http.server
    import os
    import socket
    import json

    class HTTPResponder(http.server.BaseHTTPRequestHandler):
        def do_GET(self):
            self.send_response(200)
            self.end_headers()
            resp = {
                "host": socket.gethostname(),
                "pid": os.getpid(),
                "response": os.environ.get("RESPONSE", "DEFAULT"),
                "path": self.path,
            }
            self.wfile.write(
                json.dumps(resp).encode('utf-8')
            )

    httpd = http.server.HTTPServer(
        ('localhost', 9080),
        HTTPResponder
    )
    httpd.serve_forever()
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpy-stable
  labels:
    app: httpy
spec:
  replicas: 1
  selector:
    matchLabels:
      app: httpy
      version: v1
      isCanary: "false"
  template:
    metadata:
      labels:
        app: httpy
        version: v1
        isCanary: "false"
    spec:
      volumes:
        - name: python-files
          configMap:
            name: httpy-files
      containers:
        - name: httpy
          image: "python:rc-alpine"
          volumeMounts:
            - name: python-files
              mountPath: /py
          command:
            - "python3"
          args:
            - "/py/server.py"
          env:
            - name: RESPONSE
              value: "PRODUCTION"
          ports:
            - name: http
              containerPort: 9080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpy-canary
  labels:
    app: httpy
spec:
  replicas: 1
  selector:
    matchLabels:
      app: httpy
      version: v2
      isCanary: "true"
  template:
    metadata:
      labels:
        app: httpy
        version: v2
        isCanary: "true"
    spec:
      volumes:
        - name: python-files
          configMap:
            name: httpy-files
      containers:
        - name: httpy
          image: "python:rc-alpine"
          volumeMounts:
            - name: python-files
              mountPath: /py
          command:
            - "python3"
          args:
            - "/py/server.py"
          env:
            - name: RESPONSE
              value: "CANARY"
          ports:
            - name: http
              containerPort: 9080
---
apiVersion: v1
kind: Service
metadata:
  name: httpy
  labels:
    app: httpy
spec:
  selector:
    app: httpy
  ports:
    - name: http
      port: 9080
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: httpy
spec:
  hosts:
    - httpy
  http:
    - route:
      - destination:
          host: httpy
          subset: prod
        weight: 90
      - destination:
          host: httpy
          subset: canary
        weight: 10
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: httpy
spec:
  host: httpy
  subsets:
  - name: prod
    labels:
      isCanary: "false"
  - name: canary
    labels:
      isCanary: "true"