6.5.4. Connecting the Spring PetClinic sample application to the PostgreSQL database service

Procedure

1. Create a ServiceBinding CR to project the binding data:

   $ oc apply -n my-petclinic -f - << EOD
   ---
   apiVersion: binding.operators.coreos.com/v1alpha1
   kind: ServiceBinding
   metadata:
       name: spring-petclinic-pgcluster
   spec:
     services: 

   1

   
       - group: postgresql.dev4devs.com
         kind: Database 

   2

   
         name: sampledatabase
         version: v1alpha1
     application: 

   3

   
       name: spring-petclinic
       group: apps
       version: v1
       resource: deployments
   EOD

   1

   Specifies a list of service resources.

   2

   The CR of the database.

   3

   The sample application that points to a Deployment or any other similar resource with an embedded PodSpec.

   The output verifies that the ServiceBinding CR is created to project the binding data into the sample application.

   Example output

   servicebinding.binding.operators.coreos.com/spring-petclinic created

2. Verify that the request for service binding is successful:

   $ oc get servicebindings -n my-petclinic

   Example output

   NAME                          READY   REASON              AGE
   spring-petclinic-postgresql   True    ApplicationsBound   47m

   By default, the values from the binding data of the database service are projected as files into the workload container that runs the sample application. For example, all the values from the Secret resource are projected into the bindings/spring-petclinic-pgcluster directory.

3. Once this is created, you can go to the topology to see the visual connection.

   그림 6.1. Connecting spring-petclinic to a sample database

   

4. Set up the port forwarding from the application port to access the sample application from your local environment:

   $ oc port-forward --address 0.0.0.0 svc/spring-petclinic 8080:80 -n my-petclinic

   Example output

   Forwarding from 0.0.0.0:8080 -> 8080
   Handling connection for 8080

5. Access http://localhost:8080.

   You can now remotely access the Spring PetClinic sample application at localhost:8080 and see that the application is now connected to the database service.