traffic.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: kube-traffic-generator
---
kind: ServiceAccount
apiVersion: v1
metadata:
  name: traffic-generator-service-account
  namespace: kube-traffic-generator
---
apiVersion: v1
kind: Pod
metadata:
  name: traffic-generator
  namespace: kube-traffic-generator
spec:
  serviceAccount: traffic-generator-service-account
  containers:
    - name: kube-traffic-generator
      image: lachlanevenson/k8s-kubectl
      command:
        - /bin/sh
        - -ec
        - |
          apk add --no-cache curl

          kubectl apply -f /etc/config/petclinic-config.yaml

          i=0
          scaleup="1"
          while true; do
            if [[ $(( $i % 100 )) -eq "0" ]]; then
              if [[ $scaleup -eq "1" ]]; then
                kubectl scale deployment spring-petclinic-web --replicas 40
                echo "Scaled up"
                scaleup="0"
              else
                kubectl scale deployment spring-petclinic-web --replicas 20
                echo "Scaled down"
                scaleup="1"
              fi
            fi

            curl http://petclinic:28080/owners > /dev/null || true
            curl http://petclinic:28080/ > /dev/null || true
            curl http://petclinic:28080/vets > /dev/null|| true

            sleep 1
            i=$((i+1))
            echo "Incremented counter to $i"
          done
      volumeMounts:
        - name: petclinic-config
          mountPath: /etc/config
  volumes:
    - name: petclinic-config
      configMap:
        name: traffic-generator-configmap
        items:
          - key: petclinic-config
            path: petclinic-config.yaml
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: traffic-generator-configmap
  namespace: kube-traffic-generator
data:
  petclinic-config: |
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: spring-petclinic-web
      namespace: kube-traffic-generator
    spec:
      selector:
        matchLabels:
          app: petclinic
      replicas: 2
      template:
        metadata:
          labels:
            app: petclinic
        spec:
          containers:
          - name: petclinic
            image: jbrisbin/spring-petclinic
            ports:
            - containerPort: 8080
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: petclinic
      namespace: kube-traffic-generator
    spec:
      selector:
        app: petclinic
      ports:
      - protocol: TCP
        port: 28080
        targetPort: 8080
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: kube-traffic-generator
  name: deployments-updater
rules:
- apiGroups: ["extensions", "apps"]
  resources: ["deployments", "deployments/scale"]
  verbs: ["get", "watch", "update", "patch", "create", "delete", "list"]
- apiGroups: [""]
  resources: ["services"]
  verbs: ["get", "watch", "create", "patch", "update", "delete", "list"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: update-deployments
  namespace: kube-traffic-generator
subjects:
- kind: ServiceAccount
  name: traffic-generator-service-account
roleRef:
  kind: Role
  name: deployments-updater
  apiGroup: rbac.authorization.k8s.io