webapp-deployment.yml

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: webapp
spec:
  template:
    metadata:
      labels:
        app: webapp
    spec:
      volumes:
        - name: config-volume
          configMap:
            name: app-config
      initContainers:
      - name: check-db-ready
        image: postgres:9.6.5
        command: ['sh', '-c', 
          'until pg_isready -h postgres -p 5432; 
          do echo waiting for database; sleep 2; done;']
      containers:
      - image: xcoulon/go-url-shortener:0.2.0
        name: go-url-shortener
        volumeMounts:
        - name: config-volume
          mountPath: /etc/config
        ports:
        - containerPort: 8080
        env:
        - name: CONFIG_FILE
          value: /etc/config/config.yaml
        - name: POSTGRES_HOST
          value: postgres
        - name: POSTGRES_PORT
          value: "5432"
        - name: POSTGRES_DATABASE
          valueFrom:
            secretKeyRef:
              name: database-secret-config
              key: dbname
        - name: POSTGRES_USER
          valueFrom:
            secretKeyRef:
              name: database-secret-config
              key: username
        - name: POSTGRES_PASSWORD
          valueFrom:
            secretKeyRef:
              name: database-secret-config
              key: password