added pv, release strategies and hpa

Author: vijayboopathy

exercises/110-pv.md

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+#### 1. Create a Storage Class manifest with the following properties.
+```
+name: gke
+provisioner: kubernetes.io/gce-pd
+type: pd-ssd
+zones: us-central1-a
+```
+
+#### 2. Fix and complete the following PVC manifest.
+```
+kind: persistentVolumeClaim
+apiVersion: v1beta1
+metadata:
+  name: jenkins-data
+  annotations:
+    volume.beta.kubernetes.io/storage-class: gke
+spec:
+  accessMode:
+  - ReadWriteMany
+    xxx:
+      storage: 10Gi
+```
+
+#### 3. Convert the following Deployment to use the above created PVC.
+```
+apiVersion: apps/v1beta1
+kind: Deployment
+metadata:
+  name: jenkins
+  labels:
+    app: jenkins
+    tier: platform
+    environment: dev
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: jenkins
+        tier: platform
+        environment: dev
+    spec:
+      containers:
+      - name: jenkins
+        image: jenkins
+        ports:
+        - containerPort: 8080
+        - containerPort: 50000
+        volumeMounts:
+        - name: jenkins
+          mountPath: /var/lib/jenkins
+      [xxx]:
+      - yyy
+      securityContext:
+        fsGroup: 1000
+``` 

exercises/120-release-strategy.md

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+#### 1. Create a Deployment manifest which uses `Recreate` as its deployment strategy with the following properties.
+```
+Name: mogambo
+Replicas: 3
+Image: schoolofdevops/frontend:latest
+```
+
+#### 2. Create a Deployment with version 1 of the image and then do a rolling update to version 2.
+```
+Image Version 1: schoolofdevops/frontend:v1.0
+Image Version 2: schoolofdevops/frontend:v2.0
+maxUnavailable pods should be 1.
+maxSurge should be 2.
+```
+
+#### 3. Convert the above created Deployment manifest with Blue/Green strategy.
+```
+Version 1: Blue
+Version 2: Green
+```
+

exercises/130-hpa.md

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+#### 1. When you deploy the metrics server, you are not able to get metrics either from Pods or Nodes. After debugging further, you found out that the metrics-server Pods is not running with following error. How would you go about fixing this issue?
+```
+[metrics-server-logs]
+I0919 11:06:38.614962       1 serving.go:273] Generated self-signed cert (apiserver.local.config/certificates/apiserver.crt, apiserver.local.config/certificates/apiserver.key)
+[restful] 2018/09/19 11:06:39 log.go:33: [restful/swagger] listing is available at https://:443/swaggerapi
+[restful] 2018/09/19 11:06:39 log.go:33: [restful/swagger] https://:443/swaggerui/ is mapped to folder /swagger-ui/
+I0919 11:06:39.698970       1 serve.go:96] Serving securely on [::]:443
+E0919 11:06:50.112929       1 reststorage.go:101] unable to fetch node metrics for node "kubeadm-test": no metrics known for node "kubeadm-test"
+E0919 11:06:50.112964       1 reststorage.go:101] unable to fetch node metrics for node "kubeadm-test-2": no metrics known for node "kubeadm-test-2"
+E0919 11:06:52.638381       1 reststorage.go:101] unable to fetch node metrics for node "kubeadm-test": no metrics known for node "kubeadm-test"
+E0919 11:06:52.638404       1 reststorage.go:101] unable to fetch node metrics for node "kubeadm-test-2": no metrics known for node "kubeadm-test-2"
+E0919 11:07:39.693561       1 manager.go:102] unable to fully collect metrics: [unable to fully scrape metrics from source kubelet_summary:kubeadm-test: unable to fetch metrics from Kubelet kubeadm-test (kubeadm-test): Get https://kubeadm-test:10250/stats/summary/: x509: certificate signed by unknown authority, unable to fully scrape metrics from source kubelet_summary:kubeadm-test-2: unable to fetch metrics from Kubelet kubeadm-test-2 (kubeadm-test-2): Get https://kubeadm-test-2:10250/stats/summary/: x509: certificate signed by unknown authority]
+```
+
+#### 2. Create a Deployment manifest with following properties.
+```
+image: schoolofdevops/frontend:v1.0
+minimum available memory: 128mb
+minimum available cpu: 0.25 core
+maximum available memory: 256mb
+maximum available cpu: 0.50 core
+```
+
+#### 3. Create a HPA for the above created Deployment with following propeties.
+```
+cpu target utilization: 50%
+memory target utiliztion: 200mb
+```