traffic split rotator

strest-blue-green.yml

---
kind: Namespace
apiVersion: v1
metadata:
  name: strest
  labels:
    app: strest

# target.strest.svc.cluster.local receives all strest traffic.
---
kind: Service
apiVersion: v1
metadata:
  name: target
  namespace: strest
  labels:
    app: strest
    strest-role: server
spec:
  type: ClusterIP
  selector:
    app: strest
    strest-role: server
  ports:
    - name: strest-grpc
      port: 8888
      targetPort: 8888

# blue.strest.svc.cluster.local sends traffic to blue pods
---
kind: Service
apiVersion: v1
metadata:
  name: blue
  namespace: strest
  labels:
    app: strest
    strest-role: server
    strest-color: blue
spec:
  type: ClusterIP
  selector:
    app: strest
    strest-role: server
    strest-color: blue
  ports:
    - name: strest-grpc
      port: 8888
      targetPort: 8888

# green.strest.svc.cluster.local sends traffic to green pods
---
kind: Service
apiVersion: v1
metadata:
  name: green
  namespace: strest
  labels:
    app: strest
    strest-role: server
    strest-color: green
spec:
  type: ClusterIP
  selector:
    app: strest
    strest-role: server
    strest-color: green
  ports:
    - name: strest-grpc
      port: 8888
      targetPort: 8888

---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: strest-server-blue
  namespace: strest
  labels:
    app: strest
    strest-role: server
    strest-color: blue
spec:
  replicas: 1
  selector:
    matchLabels:
      app: strest
      strest-role: server
      strest-color: blue
  template:
    metadata:
      labels:
        app: strest
        strest-role: server
        strest-color: blue
    spec:
      containers:
        - name: main
          image: buoyantio/strest-grpc:0.0.6
          imagePullPolicy: IfNotPresent
          ports:
            - name: strest-grpc
              containerPort: 8888
            - name: admin-http
              containerPort: 9999
          args: ["server", "--address=:8888", "--metricAddr=:9999"]

---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: strest-server-green
  namespace: strest
  labels:
    app: strest
    strest-role: server
    strest-color: green
spec:
  replicas: 1
  selector:
    matchLabels:
      app: strest
      strest-role: server
      strest-color: green
  template:
    metadata:
      labels:
        app: strest
        strest-role: server
        strest-color: green
    spec:
      containers:
        - name: main
          image: buoyantio/strest-grpc:0.0.6
          imagePullPolicy: IfNotPresent
          ports:
            - name: strest-grpc
              containerPort: 8888
            - name: admin-http
              containerPort: 9999
          args: ["server", "--address=:8888", "--metricAddr=:9999"]

---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: strest-client
  namespace: strest
  labels:
    app: strest
    strest-role: client
spec:
  replicas: 1
  selector:
    matchLabels:
      app: strest
      strest-role: client
  template:
    metadata:
      labels:
        app: strest
        strest-role: client
    spec:
      containers:
        - name: main
          image: buoyantio/strest-grpc:0.0.6
          imagePullPolicy: IfNotPresent
          ports:
            - name: admin-http
              containerPort: 9999
          args:
            [
              "client",
              "--address",
              "target:8888",
              "--metricAddr",
              ":9999",
              "--streams",
              "1",
            ]

---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: split-updater
  name: split-updater
  namespace: strest
spec:
  replicas: 1
  selector:
    matchLabels:
      app: split-updater
  template:
    metadata:
      labels:
        app: split-updater
      annotations:
        linkerd.io/inject: disabled
    spec:
      serviceAccount: split-updater
      volumes:
        - name: ts
          configMap:
            name: trafficsplits
      containers:
        - image: lachlanevenson/k8s-kubectl:v1.18.0
          name: split-updater
          env:
            - name: NS
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          volumeMounts:
            - name: ts
              mountPath: /ts
          command:
            - /bin/sh
          args:
            - -c
            - |-
              set -x
              echo "namespace=$NS"
              while true; do
                sleep 10
                kubectl -n "$NS" apply -f /ts/blue-green.yml
                sleep 120
                kubectl -n "$NS" apply -f /ts/green-blue.yml
                sleep 120
                kubectl -n "$NS" delete -f /ts/green-blue.yml
                sleep 110
              done

---
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: strest
  name: trafficsplits
data:
  blue-green.yml: |-
    apiVersion: split.smi-spec.io/v1alpha1
    kind: TrafficSplit
    metadata:
      namespace: strest
      name: blue-green
    spec:
      service: target
      backends:
      - service: blue
        weight: 90m
      - service: green
        weight: 10m
  green-blue.yml: |-
    apiVersion: split.smi-spec.io/v1alpha1
    kind: TrafficSplit
    metadata:
      namespace: strest
      name: blue-green
    spec:
      service: target
      backends:
      - service: blue
        weight: 10m
      - service: green
        weight: 90m

---
kind: ServiceAccount
apiVersion: v1
metadata:
  name: split-updater
  namespace: strest
  labels:
    app: split-updater
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: strest:split-updater
  namespace: strest
  labels:
    app: split-updater
rules:
  - apiGroups: ["split.smi-spec.io"]
    resources: ["trafficsplits"]
    verbs: ["create", "delete", "get", "update", "patch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: strest:split-updater
  namespace: strest
  labels:
    app: split-updater
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: strest:split-updater
subjects:
  - kind: ServiceAccount
    name: split-updater