app.yaml

apiVersion: v1
kind: ConfigMap
metadata:
    name: app
data:
    MYSQL_HOST: "db"
    MYSQL_DATABASE: "auth"
    MYSQL_USER: "app"
    MYSQL_PASSWORD: "password"
    MYSQL_ROOT_PASSWORD: "rootpassword"
---
apiVersion: v1
kind: Service
metadata:
  name: app
  labels:
    role: app
spec:
  selector:
    role: app
  ports:
    - protocol: TCP
      port: 80
      targetPort: http
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: app
  labels:
    role: app
spec:
  replicas: 1
  template:
    metadata:
      labels:
        role: app
    spec:
      containers:
      - name: app
        image: quay.io/etoews/app:dumb-init
        args:
        - --db-host=$(MYSQL_HOST)
        - --db-user=$(MYSQL_USER)
        - --db-password=$(MYSQL_PASSWORD)
        envFrom:
        - configMapRef:
            name: app
        resources:
          limits:
            cpu: 100m
            memory: 100Mi
        ports:
        - name: http
          containerPort: 8080
          protocol: TCP
      initContainers:
      - name: wait-for-db
        image: mysql
        command:
        - "sh"
        - "-c"
        - "until mysql -h$MYSQL_HOST -u$MYSQL_USER -p$MYSQL_PASSWORD -e'quit' --connect-timeout=2; do sleep 2; done"
        envFrom:
        - configMapRef:
            name: app
---
apiVersion: v1
kind: Service
metadata:
  name: db
  labels:
    role: db
spec:
  selector:
    role: db
  ports:
    - protocol: TCP
      port: 3306
      targetPort: mysql
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: db
  labels:
    role: db
spec:
  replicas: 1
  template:
    metadata:
      labels:
        role: db
    spec:
      containers:
      - name: db
        image: mysql
        ports:
        - name: mysql
          containerPort: 3306
        resources:
          limits:
            cpu: 100m
            memory: 1Gi
        envFrom:
        - configMapRef:
            name: app