Chapter 16 updates

Signed-off-by: Lachlan Evenson <lachlan.evenson@gmail.com>

16-1-dns-service.yaml

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+kind: Service
+apiVersion: v1
+metadata:
+  name: external-database
+spec:
+  type: ExternalName
+  externalName: database.company.com

16-10-mongo-simple.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: mongo
+spec:
+  serviceName: "mongo"
+  replicas: 3
+  selector:
+    matchLabels:
+      app: mongo
+  template:
+    metadata:
+      labels:
+        app: mongo
+    spec:
+      containers:
+      - name: mongodb
+        image: mongo:3.4.24
+        command:
+        - mongod
+        - --replSet
+        - rs0
+        ports:
+        - containerPort: 27017
+          name: peer

16-11-mongo-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: mongo
+spec:
+  ports:
+  - port: 27017
+    name: peer
+  clusterIP: None
+  selector:
+    app: mongo

16-12-mongo-configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mongo-init
+data:
+  init.sh: |
+    #!/bin/bash
+
+    # Need to wait for the readiness health check to pass so that the
+    # mongo names resolve. This is kind of wonky.
+    until ping -c 1 ${HOSTNAME}.mongo; do
+      echo "waiting for DNS (${HOSTNAME}.mongo)..."
+      sleep 2
+    done
+
+    until /usr/bin/mongo --eval 'printjson(db.serverStatus())'; do
+      echo "connecting to local mongo..."
+      sleep 2
+    done
+    echo "connected to local."
+
+    HOST=mongo-0.mongo:27017
+
+    until /usr/bin/mongo --host=${HOST} --eval 'printjson(db.serverStatus())'; do
+      echo "connecting to remote mongo..."
+      sleep 2
+    done
+    echo "connected to remote."
+
+    if [[ "${HOSTNAME}" != 'mongo-0' ]]; then
+      until /usr/bin/mongo --host=${HOST} --eval="printjson(rs.status())" \
+            | grep -v "no replset config has been received"; do
+        echo "waiting for replication set initialization"
+        sleep 2
+      done
+      echo "adding self to mongo-0"
+      /usr/bin/mongo --host=${HOST} \
+         --eval="printjson(rs.add('${HOSTNAME}.mongo'))"
+    fi
+
+    if [[ "${HOSTNAME}" == 'mongo-0' ]]; then
+      echo "initializing replica set"
+      /usr/bin/mongo --eval="printjson(rs.initiate(\
+          {'_id': 'rs0', 'members': [{'_id': 0, \
+           'host': 'mongo-0.mongo:27017'}]}))"
+    fi
+    echo "initialized"
+
+    while true; do
+      sleep 3600
+    done

16-13-mongo.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: mongo
+spec:
+  serviceName: "mongo"
+  replicas: 3
+  selector:
+    matchLabels:
+      app: mongo
+  template:
+    metadata:
+      labels:
+        app: mongo
+    spec:
+      containers:
+      - name: mongodb
+        image: mongo:3.4.1
+        command:
+        - mongod
+        - --replSet
+        - rs0
+        ports:
+        - containerPort: 27017
+          name: web
+      - name: init-mongo
+        image: mongo:3.4.1
+        command:
+        - bash
+        - /config/init.sh
+        volumeMounts:
+        - name: config
+          mountPath: /config
+      volumes:
+      - name: config
+        configMap:
+          name: "mongo-init"

16-2-external-ip-service.yaml

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+kind: Service
+apiVersion: v1
+metadata:
+  name: external-ip-database
+spec:
+  ports:
+  - port: 3306

16-3-external-ip-endpoints.yaml

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+kind: Endpoints
+apiVersion: v1
+metadata:
+  name: external-ip-database
+subsets:
+  - addresses:
+    - ip: 192.168.0.1
+    ports:
+    - port: 3306

16-4-nfs-volume.yaml

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+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: database
+  labels:
+    volume: my-volume
+spec:
+  accessModes:
+  - ReadWriteMany
+  capacity:
+    storage: 1Gi
+  nfs:
+    server: 192.168.0.1
+    path: "/exports"

16-5-nfs-volume-claim.yaml

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+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: database
+spec:
+  accessModes:
+  - ReadWriteMany
+  resources:
+    requests:
+      storage: 1Gi
+  selector:
+    matchLabels:
+      volume: my-volume

16-6-mysql-replicaset.yaml

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+apiVersion: apps/v1
+kind: ReplicaSet
+metadata:
+  name: mysql
+  # labels so that we can bind a Service to this Pod
+  labels:
+    app: mysql
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mysql
+  template:
+    metadata:
+      labels:
+        app: mysql
+    spec:
+      containers:
+      - name: database
+        image: mysql
+        resources:
+          requests:
+            cpu: 1
+            memory: 2Gi
+        env:
+        # Environment variables are not a best practice for security,
+        # but we're using them here for brevity in the example.
+        # See Chapter 11 for better options.
+        - name: MYSQL_ROOT_PASSWORD
+          value: some-password-here
+        livenessProbe:
+          tcpSocket:
+            port: 3306
+        ports:
+        - containerPort: 3306
+        volumeMounts:
+          - name: database
+            # /var/lib/mysql is where MySQL stores its databases
+            mountPath: "/var/lib/mysql"
+      volumes:
+      - name: database
+        persistentVolumeClaim:
+          claimName: database

16-7-mysql-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: mysql
+spec:
+  ports:
+  - port: 3306
+    protocol: TCP
+  selector:
+    app: mysql

16-8-storageclass.yaml

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+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: default
+  annotations:
+    storageclass.beta.kubernetes.io/is-default-class: "true"
+  labels:
+    kubernetes.io/cluster-service: "true"
+provisioner: kubernetes.io/azure-disk

16-9-dynamic-volume-claim.yaml

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+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: my-claim
+  annotations:
+    volume.beta.kubernetes.io/storage-class: default
+spec:
+  accessModes:
+  - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi