Spring DataSource in Kubernetes for MySQL

I have deployed in the IBM Cloud a MySQL Database and a Spring Boot Application with Kubernetes. MySQL database has a deployment and a service but it should not accessible in the outside that's way i gave him a cluster ip. But the Spring application is load balancing, because it should be visible from clients. My MySQL data source didn't work which i write in my spring data source. In local case i write there just localhost, but in the Cloud this doesn't work ? Has anybody a idea how that works ?

Deployment file: apiVersion: apps/v1 kind: Deployment metadata: name: db enviroment: test spec: selector: matchLabels: app: mysql enviroment: test strategy: type: Recreate template: metadata: labels: app: mysql enviroment: test spec: containers: - image: de.icr.io/test/mysql:5.7 name: db env: - name: MYSQL_ROOT_PASSWORD value: ************ - name: MYSQL_USER value: ******** - name: MYSQL_PASSWORD value: *********** - name: MYSQL_DATABASE value: ******* ports: - containerPort: 3306 name: db volumeMounts: - name: mysql-persistent-storage mountPath: /var/lib/mysql volumes: - name: mypvc persistentVolumeClaim: claimName: mysql-pv-claim 

That is my services:

apiVersion: v1 kind: Service metadata: name: mysqlservices spec: ports: - port: 3306 protocol: TCP targetPort: 3306 selector: app: mysql enviroment: test 

I know you will not need my perssistens volume claime but i send it.

apiVersion: v1 kind: PersistentVolumeClaim metadata: name: mypvc labels: billingType: "monthly" region: eu-de zone: Frankfurt spec: accessModes: - ReadWriteMany resources: requests: storage: 20Gi storageClassName: ibmc-file-bronze 

And at last the Spring Boot datasource i don't know what i will write in the url for the connection.

 <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" primary="true"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://db/nlfb?useSSL=false" /> <property name="username" value="*****" /> <property name="password" value="******" /> </bean> 

kind regards and thanks for your help.