kubernetes.yaml

################################################################################
# Create volume for DB server
# https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html/getting_started_with_kubernetes/get_started_provisioning_storage_in_kubernetes
# https://kubernetes.io/docs/getting-started-guides/minikube/#configuring-kubernetes
# https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims
kind: PersistentVolume
apiVersion: v1
metadata:
  name: mysql001
  labels:
    type: local
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/data/mysql001"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: mysql001-1
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
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---
# https://github.com/kubernetes/examples/blob/master/guestbook/all-in-one/guestbook-all-in-one.yaml
# https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
apiVersion: apps/v1beta2 # for versions before 1.8.0 use apps/v1beta1
kind: Deployment
metadata:
  name: dbserver-deployment
  labels:
    app: dbserver
spec:
  replicas: 1
  selector:
    matchLabels:
      app: dbserver
  template:
    metadata:
      labels:
        app: dbserver
    spec:
      containers:
      - name: dbserver
        image: mariadb
        # https://kubernetes.io/docs/concepts/policy/resource-quotas/
        resources:
          requests:
            cpu: 400m
            memory: 600Mi
        ports:
        - containerPort: 3306
        env:
        # https://kubernetes.io/docs/concepts/configuration/secret/#using-secrets-as-environment-variables
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysecret
              key: mysql_root_password
        # https://kubernetes.io/docs/concepts/storage/persistent-volumes/#claims-as-volumes
        volumeMounts:
        - mountPath: "/var/lib/mysql"
          name: mysqlstorage
      volumes:
      - name: mysqlstorage
        persistentVolumeClaim:
          claimName: mysql001-1
---
# Use services to export my app
# https://kubernetes.io/docs/concepts/services-networking/service/
apiVersion: v1
kind: Service
metadata:
  name: my-dbserver-service
  labels:
    app: dbserver
spec:
  type: NodePort  
  ports:
  - port: 3306
    targetPort: 3306
  selector:
    app: dbserver
################################################################################
---
# https://github.com/kubernetes/examples/blob/master/guestbook/all-in-one/guestbook-all-in-one.yaml
# https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
apiVersion: apps/v1beta2 # for versions before 1.8.0 use apps/v1beta1
kind: Deployment
metadata:
  name: dbclient-deployment
  labels:
    app: dbclient
spec:
  replicas: 2
  selector:
    matchLabels:
      app: dbclient
  template:
    metadata:
      labels:
        app: dbclient
    spec:
      containers:
      - name: dbclient
        # Docker Image: https://hub.docker.com/_/adminer/
        image: adminer
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 8080
---
# Use services to export my app
# https://kubernetes.io/docs/concepts/services-networking/service/
apiVersion: v1
kind: Service
metadata:
  name: my-dbclient-service
  labels:
    app: dbclient
spec:
  type: NodePort  
  ports:
  - port: 8080
    targetPort: 8080
  selector:
    app: dbclient