Update to latest metrics-server 0.3.x works

With kubelet service file fixed and correct args set in
metrics-server-deployment.yaml, autoscale seems to be working reliably.

Fixes: #5

Signed-off-by: Saikrishna Edupuganti <saikrishna.edupuganti@intel.com>

clr-k8s-examples/1-core-metrics/aggregated-metrics-reader.yaml

@@ -0,0 +1,12 @@
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: system:aggregated-metrics-reader
+  labels:
+    rbac.authorization.k8s.io/aggregate-to-view: "true"
+    rbac.authorization.k8s.io/aggregate-to-edit: "true"
+    rbac.authorization.k8s.io/aggregate-to-admin: "true"
+rules:
+- apiGroups: ["metrics.k8s.io"]
+  resources: ["pods"]
+  verbs: ["get", "list", "watch"]

clr-k8s-examples/1-core-metrics/auth-delegator.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: ClusterRoleBinding
 metadata:

clr-k8s-examples/1-core-metrics/auth-reader.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: RoleBinding
 metadata:

clr-k8s-examples/1-core-metrics/metrics-apiservice.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: apiregistration.k8s.io/v1beta1
 kind: APIService
 metadata:

clr-k8s-examples/1-core-metrics/metrics-server-deployment.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: v1
 kind: ServiceAccount
 metadata:
@@ -22,10 +23,19 @@ spec:
         k8s-app: metrics-server
     spec:
       serviceAccountName: metrics-server
+      volumes:
+      # mount in tmp so we can safely use from-scratch images and/or read-only containers
+      - name: tmp-dir
+        emptyDir: {}
       containers:
       - name: metrics-server
-        image: gcr.io/google_containers/metrics-server-amd64:v0.2.0
+        image: k8s.gcr.io/metrics-server-amd64:v0.3.1
         imagePullPolicy: Always
-        command:
-        - /metrics-server
-        - --source=kubernetes.summary_api:https://kubernetes.default.svc?kubeletHttps=true&kubeletPort=10250&useServiceAccount=true&insecure=true
+        args:
+        - --logtostderr
+        - --kubelet-insecure-tls
+        - --kubelet-preferred-address-types=InternalIP,Hostname,ExternalIP
+        volumeMounts:
+        - name: tmp-dir
+          mountPath: /tmp
+

clr-k8s-examples/1-core-metrics/metrics-server-service.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: v1
 kind: Service
 metadata:

clr-k8s-examples/1-core-metrics/resource-reader.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRole
 metadata:
@@ -9,15 +10,6 @@ rules:
   - pods
   - nodes
   - nodes/stats
-  - namespaces
-  verbs:
-  - get
-  - list
-  - watch
-- apiGroups:
-  - "extensions"
-  resources:
-  - deployments
   verbs:
   - get
   - list

clr-k8s-examples/1-core-metrics/versions

@@ -1 +1 @@
-f90c6705d2381ea2db1a6343da6c400bd2ef4cb2
+92d8412788e27ee669d38f21f20bad5342211884

clr-k8s-examples/tests/autoscale/load-gen.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: load-generator
+spec:
+  containers:
+  - command: ["/bin/sh", "-c"]
+    args:
+    - while true; do wget -q -O- http://php-apache-test; done;
+    image: busybox
+    imagePullPolicy: Always
+    name: load-generator

clr-k8s-examples/tests/autoscale/php.yaml

@@ -0,0 +1,54 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    run: php-apache-test
+  name: php-apache-test
+spec:
+  selector:
+    matchLabels:
+      run: php-apache-test
+  template:
+    metadata:
+      labels:
+        run: php-apache-test
+    spec:
+      containers:
+      - image: k8s.gcr.io/hpa-example
+        name: php-apache-test
+        ports:
+        - containerPort: 80
+          protocol: TCP
+        resources:
+          requests:
+            cpu: 200m
+      restartPolicy: Always
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: php-apache-test
+spec:
+  ports:
+  - port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    run: php-apache-test
+  sessionAffinity: None
+  type: ClusterIP
+---
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: php-apache-test
+spec:
+  maxReplicas: 10
+  minReplicas: 1
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: php-apache-test
+  targetCPUUtilizationPercentage: 50
+

clr-k8s-examples/tests/autoscale/test-autoscale.sh

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-kubectl run php-apache-test --image=k8s.gcr.io/hpa-example --requests=cpu=200m --expose --port=80
-kubectl autoscale deployment php-apache-test --cpu-percent=50 --min=1 --max=10
-kubectl get hpa
-
-#kubectl run --generator=run-pod/v1 -i --tty load-generator --image=busybox /bin/sh
-# while true; do wget -q -O- http://php-apache-test.default.svc.cluster.local; done
+SCRIPT_DIR="$(dirname "${BASH_SOURCE[0]}")"
+kubectl apply -f $SCRIPT_DIR
+watch kubectl describe hpa