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Chapter 2. Build and Run a Java Application on the JBoss EAP for OpenShift Image

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The following workflow demonstrates using the Source-to-Image (S2I) process to build and run a Java application on the JBoss EAP for OpenShift image.

As an example, the kitchensink quickstart is used in this procedure. It demonstrates a Java EE web-enabled database application using JSF, CDI, EJB, JPA, and Bean Validation. See the kitchensink quickstart that ships with JBoss EAP 7 for more information.

2.1. Prerequisites

This workflow assumes that you already have an active OpenShift Online subscription and that you have installed the OpenShift CLI.

2.2. Prepare OpenShift for Application Deployment

  1. Log in to your OpenShift instance using the oc login command.

  2. Create a new project in OpenShift.

    A project allows a group of users to organize and manage content separately from other groups. You can create a project in OpenShift using the following command. 

    $ oc new-project PROJECT_NAME

    For example, for the kitchensink quickstart, create a new project named eap-demo using the following command. 

    $ oc new-project eap-demo

  3. Optional: Create a keystore and a secret.

    Note

    Creating a keystore and a secret is required if you are using any HTTPS-enabled features in your OpenShift project. For example, if you are using the eap72-https-s2i template, you must create a keystore and secret.

    This workflow demonstration for the kitchensink quickstart does not use an HTTPS template, so a keystore and secret are not required.

    1. Create a keystore.

      Warning

      The following commands generate a self-signed certificate, but for production environments Red Hat recommends that you use your own SSL certificate purchased from a verified Certificate Authority (CA) for SSL-encrypted connections (HTTPS).

      You can use the Java keytool command to generate a keystore using the following command. 

      $ keytool -genkey -keyalg RSA -alias ALIAS_NAME -keystore KEYSTORE_FILENAME.jks -validity 360 -keysize 2048

      For example, for the kitchensink quickstart, use the following command to generate a keystore. 

      $ keytool -genkey -keyalg RSA -alias eapdemo-selfsigned -keystore keystore.jks -validity 360 -keysize 2048

    2. Create a secret from the keystore.

      Create a secret from the previously created keystore using the following command. 

      $ oc secrets new SECRET_NAME KEYSTORE_FILENAME.jks

      For example, for the kitchensink quickstart, use the following command to create a secret. 

      $ oc secrets new eap7-app-secret keystore.jks

2.3. Import the Latest JBoss EAP for OpenShift Image Streams and Templates

Use the following command to import the latest JBoss EAP for OpenShift image streams and templates into your OpenShift project’s namespace. 

for resource in \
  eap72-image-stream.json \
  eap72-amq-persistent-s2i.json \
  eap72-amq-s2i.json \
  eap72-basic-s2i.json \
  eap72-https-s2i.json \
  eap72-mongodb-persistent-s2i.json \
  eap72-mysql-persistent-s2i.json \
  eap72-postgresql-persistent-s2i.json \
  eap72-sso-s2i.json
do
  oc replace --force -f \
https://raw.githubusercontent.com/jboss-container-images/jboss-eap-7-openshift-image/eap72/templates/${resource}
done
Note

The JBoss EAP image streams and templates imported using the above command are only available within that OpenShift project.

If you want to import the image streams and templates into a different project, add the -n PROJECT_NAME to the oc replace line of the command. For example: 

...
oc replace -n PROJECT_NAME --force -f
...

2.4. Deploy a JBoss EAP Source-to-Image (S2I) Application to OpenShift

  1. Create a new OpenShift application using the JBoss EAP for OpenShift image and your Java application’s source code. Red Hat recommends using one of the provided JBoss EAP for OpenShift templates for S2I builds.

    For example, for the kitchensink quickstart, use the following command to use the eap72-basic-s2i template in the eap-demo project, created in Prepare OpenShift for Application Deployment, with the kitchensink source code on GitHub. 

    oc new-app --template=eap72-basic-s2i \1
 -p IMAGE_STREAM_NAMESPACE=eap-demo \2
 -p SOURCE_REPOSITORY_URL=https://github.com/jboss-developer/jboss-eap-quickstarts \3
 -p SOURCE_REPOSITORY_REF=openshift \4
 -p CONTEXT_DIR=kitchensink5
    1
    The template to use.
    2
    The latest images streams and templates were imported into the project’s namespace, so you must specify the namespace of where to find the image stream. This is usually the project’s name.
    3
    URL to the repository containing the application source code.
    4
    The Git repository reference to use for the source code. This can be a Git branch or tag reference.
    5
    The directory within the source repository to build.
    Note

    A template can specify default values for many template parameters, and you might have to override some, or all, of the defaults. To see template information, including a list of parameters and any default values, use the command oc describe template TEMPLATE_NAME.

    Note

    You might also want to configure environment variables when creating your new OpenShift application.

    For example, if you are using an HTTPS template such as eap72-https-s2i, you must specify the required HTTPS environment variables HTTPS_NAME, HTTPS_PASSWORD, and HTTPS_KEYSTORE to match your keystore details.

  2. Retrieve the name of the build configuration. 

    $ oc get bc -o name

  3. Use the name of the build configuration from the previous step to view the Maven progress of the build. 

    $ oc logs -f buildconfig/BUILD_CONFIG_NAME

    For example, for the kitchensink quickstart, the following command shows the progress of the Maven build. 

    $ oc logs -f buildconfig/eap-app

2.5. Post Deployment Tasks

Depending on your application, some tasks might need to be performed after your OpenShift application has been built and deployed. This might include exposing a service so that the application is viewable from outside of OpenShift, or scaling your application to a specific number of replicas.

  1. Get the service name of your application using the following command. 

    $ oc get service

  2. Expose the main service as a route so you can access your application from outside of OpenShift. For example, for the kitchensink quickstart, use the following command to expose the required service and port. 

    $ oc expose service/eap-app --port=8080
    Note

    If you used a template to create the application, the route might already exist. If it does, continue on to the next step.

  3. Get the URL of the route. 

    $ oc get route

  4. Access the application in your web browser using the URL. The URL is the value of the HOST/PORT field from previous command’s output.

    If your application does not use the JBoss EAP root context, append the context of the application to the URL. For example, for the kitchensink quickstart, the URL might be http://HOST_PORT_VALUE/kitchensink/.

  5. Optionally, you can also scale up the application instance by running the following command. This increases the number of replicas to 3. 

    $ oc scale deploymentconfig DEPLOYMENTCONFIG_NAME --replicas=3

    For example, for the kitchensink quickstart, use the following command to scale up the application. 

    $ oc scale deploymentconfig eap-app --replicas=3
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