apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: mysql
spec:
  replicas: 1
  template:
    metadata:
      name: mysql
      labels:
        name: mysql
    spec:
      containers:
         - image: b.gcr.io/cloudsql-docker/gce-proxy:1.05
           name: cloudsql-proxy
           command: ["/cloud_sql_proxy", "--dir=/cloudsql",
                     "-instances=MYSQL:ZONE:DATABASE_INSTANCE=tcp:0.0.0.0:3306",
                     "-credential_file=/secrets/cloudsql/credentials.json"]
           volumeMounts:
             - name: cloudsql-oauth-credentials
               mountPath: /secrets/cloudsql
               readOnly: true
             - name: ssl-certs
               mountPath: /etc/ssl/certs
           ports:
             - containerPort: 3306
               name: mysql
      volumes:
        - name: cloudsql-oauth-credentials
          secret:
            secretName: cloudsql-oauth-credentials
        - name: ssl-certs
          hostPath:
            path: /etc/ssl/certs

apiVersion: v1
kind: Service
metadata:
  name: cloudsqlproxy
spec:
  ports:
  - port: 3306
    targetPort: database-port
  selector:
    app: cloudsqlproxy
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: cloudsqlproxy
spec:
  template:
    metadata:
      labels:
        app: cloudsqlproxy
    spec:
      volumes:
      - name: service-account-token
        secret:
          secretName: service-account-token
      containers:
      - name: cloudsql-proxy
        image: gcr.io/cloudsql-docker/gce-proxy:1.11
        imagePullPolicy: Always
        command:
        - /cloud_sql_proxy
        - -instances=<project>:<cloudsqlinstance>=tcp:0.0.0.0:3306
        - -credential_file=/secrets/cloudsql/credentials.json
        ports:
        - name: database-port
          containerPort: 3306
        volumeMounts:
        - name: service-account-token
          mountPath: /secrets/cloudsql
          readOnly: true

apiVersion: extensions/v1beta1
...
spec:
  template:
    ...
    spec:
      volumes:
      ...
      containers:
      - name: cloudsql-proxy
        ...
        ports:
        - name: database-port1
          containerPort: 3306
        - name: database-port2
          containerPort: 3307
        ...

apiVersion: v1
kind: Service
metadata:
  name: cloudsqlproxy
spec:
  ports:
  - port: 3306
    targetPort: database-port1
  selector:
    app: cloudsqlproxy
---
apiVersion: v1
kind: Service
metadata:
  name: cloudsqlproxy
spec:
  ports:
  - port: 3306
    targetPort: database-port2
  selector:
    app: cloudsqlproxy

mysql --host=sqlproxy-service-database1 --port=3306 ...
mysql --host=sqlproxy-service-database2 --port=3306 ...