Chapter 8. Running a SpringBoot business application on Red Hat OpenShift Container Platform

Procedure

1. Outside the business application project directories, create an ocp-image directory with the following subdirectories:

   ocp-image
   |--/root
     |--/opt
       |-- /spring-service

2. Copy the single JAR file for your business application into the root/opt/spring-service subdirectory. For example:

   cd ../business-application-service
   cp target/business-application-service-1.0-SNAPSHOT.jar ../ocp-image/root/opt/spring-service/

3. In the ocp-image directory, create a Dockerfile file with the following content:

   FROM registry.access.redhat.com/ubi8/openjdk-11:latest
   COPY root /
   EXPOSE 8090
   WORKDIR /opt/spring-service/
   CMD ["sh","-c", "java ${JAVA_OPTIONS} -Dorg.kie.server.mode=PRODUCTION -jar /opt/spring-service/<FILENAME>.jar"]

   Replace <FILENAME>.jar with the name of the single JAR file for your business application.

   Alternatively, if you want to configure communication with Business Central Monitoring, use the following content for Dockerfile:

   FROM registry.access.redhat.com/ubi8/openjdk-11:latest
   COPY root /
   EXPOSE 8090
   WORKDIR /opt/spring-service/
   CMD ["sh","-c", "java ${JAVA_OPTIONS} -Dorg.kie.server.location=${KIESERVER_LOCATION} -Dorg.kie.server.controller=${KIESERVER_CONTROLLERS} -Dorg.kie.server.controller.user=${KIE_SERVER_CONTROLLER_USER} -Dorg.kie.server.controller.pwd=${KIE_SERVER_CONTROLLER_PWD} -Dorg.kie.server.mode=PRODUCTION -jar /opt/spring-service/<FILENAME>.jar"]

   Replace <FILENAME>.jar with the name of the single JAR file for your business application.

4. To build the initial image and deploy it in your Red Hat OpenShift Container Platform environment, complete the following steps:

   1. To build the image, run the following commands in the ocp-image directory:

      oc new-build --binary --strategy=docker --name openshift-kie-springboot
      oc start-build openshift-kie-springboot --from-dir=. --follow

      Optional: replace openshift-kie-springboot with a custom application name in these commands and all subsequent commands.

   2. To deploy the image in the Red Hat OpenShift Container Platform environment, run the following command:

      oc new-app openshift-kie-springboot

      Alternatively, to deploy the image and configure it to communicate with Business Central Monitoring, run the following command:

      oc new-app openshift-kie-springboot -e KIESERVER_LOCATION=http://<LOCATION>:<PORT>/rest/server -e KIESERVER_CONTROLLERS=ws://<BC-HOSTNAME>:<BC-PORT>/websocket/controller -e KIE_SERVER_CONTROLLER_USER=USER -e KIE_SERVER_CONTROLLER_PWD=PASSWORD

      In this command, replace the following values:

      • <LOCATION> with the fully qualified host name for accessing your service. Business Central Monitoring accesses the service to retrieve process information and displays a URL for the service with this host name
      • <PORT> with the port for accessing your service, for example, 8090
      • <BC-HOSTNAME> with the host name for accessing the Business Central Monitoring instance. If your application is deployed in the same project/namespace as the Business Central Monitoring instance, use the service name for Business Central Monitoring, for example, myapp-rhpamcentrmon. Otherwise, you can use use the fully qualified host name of a route for the Business Central Monitoring instance.
      • <BC-PORT> with the port of the Business Central Monitoring instance, for example, 8080
      • <USER> with the username of a user configured on the Business Central Monitoring instance

      • <PASSWORD> with the password of the user configured on the Business Central Monitoring instance

        Note

        This configuration uses unsecured HTTP communication for your service. If you configure your Spring Boot business application with a valid SSL certificate, you can replace http: with https: to use secure HTTPS communication. For more information about configuring SSL on Spring Boot, see Spring Boot documentation.

        Note

        If you want to view process information from Business Central Monitoring, you must ensure that the user that is logged into Business Central Monitoring can also be authenticated with your service using the same password.

   3. Optional: To expose the route for the image, run the following command:

      oc expose service/openshift-kie-springboot --port=8090

5. If you already built and deployed the image and need to update it, for example if you built the JAR file for a new version of Red Hat Process Automation Manager or of Spring Boot, run the following command in the ocp-image directory:

   oc start-build openshift-kie-springboot --from-dir=. --follow