Add azure cloud provider

cluster-autoscaler/cloudprovider/azure/README.md

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+# Cluster Autoscaler on Azure
+
+The cluster autoscaler on Azure scales worker nodes within any specified autoscaling group. It will run as a `Deployment` in your cluster. This README will go over some of the necessary steps required to get the cluster autoscaler up and running.
+
+## Kubernetes Version
+
+Cluster autoscaler must run on Kubernetes with Azure VMSS support ([kubernetes#43287](https://github.com/kubernetes/kubernetes/issues/43287)). It is planed in Kubernetes v1.10.
+
+## Permissions
+
+Get azure credentials by running the following command
+
+```sh
+# replace <subscription-id> with yours.
+az ad sp create-for-rbac --role="Contributor" --scopes="/subscriptions/<subscription-id>" --output json
+```
+
+And fill the values with the result you got into the configmap
+
+```yaml
+apiVersion: v1
+data:
+  ClientID: <client-id>
+  ClientSecret: <client-secret>
+  ResourceGroup: <resource-group>
+  SubscriptionID: <subscription-id>
+  TenantID: <tenand-id>
+  ScaleSetName: <scale-set-name>
+kind: ConfigMap
+metadata:
+  name: cluster-autoscaler-azure
+  namespace: kube-system
+```
+
+Create the configmap by running
+
+```sh
+kubectl create -f cluster-autoscaler-azure-configmap.yaml
+```
+
+## Deployment
+
+```yaml
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: cluster-autoscaler
+  namespace: kube-system
+  labels:
+    app: cluster-autoscaler
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: cluster-autoscaler
+  template:
+    metadata:
+      labels:
+        app: cluster-autoscaler
+    spec:
+      containers:
+      - image: feisky/cluster-autoscaler:dev
+        name: cluster-autoscaler
+        resources:
+          limits:
+            cpu: 100m
+            memory: 300Mi
+          requests:
+            cpu: 100m
+            memory: 300Mi
+        env:
+        - name: ARM_SUBSCRIPTION_ID
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: SubscriptionID
+        - name: ARM_RESOURCE_GROUP
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ResourceGroup
+        - name: ARM_TENANT_ID
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: TenantID
+        - name: ARM_CLIENT_ID
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ClientID
+        - name: ARM_CLIENT_SECRET
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ClientSecret
+        - name: ARM_SCALE_SET_NAME
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ScaleSetName
+        command:
+          - ./cluster-autoscaler
+          - --v=4
+          - --cloud-provider=azure
+          - --skip-nodes-with-local-storage=false
+          - --nodes="1:10:$(ARM_SCALE_SET_NAME)"
+        volumeMounts:
+          - name: ssl-certs
+            mountPath: /etc/ssl/certs/ca-certificates.crt
+            readOnly: true
+        imagePullPolicy: "Always"
+      volumes:
+      - name: ssl-certs
+        hostPath:
+          path: "/etc/ssl/certs/ca-certificates.crt"
+```
+
+## Deploy in master node
+
+To run a CA pod in master node - CA deployment should tolerate the master `taint` and `nodeSelector` should be used to schedule the pods in master node.
+
+```yaml
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: cluster-autoscaler
+  namespace: kube-system
+  labels:
+    app: cluster-autoscaler
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: cluster-autoscaler
+  template:
+    metadata:
+      labels:
+        app: cluster-autoscaler
+    spec:
+      tolerations:
+      - effect: NoSchedule
+        key: node-role.kubernetes.io/master
+      nodeSelector:
+        kubernetes.io/role: master
+      containers:
+      - image: feisky/cluster-autoscaler:dev
+        name: cluster-autoscaler
+        resources:
+          limits:
+            cpu: 100m
+            memory: 300Mi
+          requests:
+            cpu: 100m
+            memory: 300Mi
+        env:
+        - name: ARM_SUBSCRIPTION_ID
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: SubscriptionID
+        - name: ARM_RESOURCE_GROUP
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ResourceGroup
+        - name: ARM_TENANT_ID
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: TenantID
+        - name: ARM_CLIENT_ID
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ClientID
+        - name: ARM_CLIENT_SECRET
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ClientSecret
+        - name: ARM_SCALE_SET_NAME
+          valueFrom:
+            configMapKeyRef:
+              name: cluster-autoscaler-azure
+              key: ScaleSetName
+        command:
+          - ./cluster-autoscaler
+          - --v=4
+          - --cloud-provider=azure
+          - --skip-nodes-with-local-storage=false
+          - --nodes="1:10:$(ARM_SCALE_SET_NAME)"
+        volumeMounts:
+          - name: ssl-certs
+            mountPath: /etc/ssl/certs/ca-certificates.crt
+            readOnly: true
+        imagePullPolicy: "Always"
+      volumes:
+      - name: ssl-certs
+        hostPath:
+          path: "/etc/ssl/certs/ca-certificates.crt"
+```