Chapter 3. Get Started

Log into the OpenShift instance by running the following command and providing credentials.

$ oc login

Create a new project.

$ oc new-project <project-name>

Create a new application using the Java S2I for OpenShift image. <source-location> can be the URL of a git repository or a path to a local folder.

$ oc new-app redhat-openjdk18-openshift~<source-location>

Get the service name.

$ oc get service

Expose the service as a route to be able to use it from the browser. <service-name> is the value of NAME field from previous command output.

$ oc expose svc/<service-name> --port=8080

Get the route.

$ oc get route

Get the JAR application archive or build the application locally.

The example below uses the undertow-servlet quickstart.

Prepare the directory structure on the local file system.

Application archives in the deployments/ subdirectory of the main binary build directory are copied directly to the standard deployments folder of the image being built on OpenShift. For the application to deploy, the directory hierarchy containing the web application data must be correctly structured.

Create main directory for the binary build on the local file system and deployments/ subdirectory within it. Copy the previously built JAR archive to the deployments/ subdirectory:

undertow-servlet]$ ls
dependency-reduced-pom.xml  pom.xml  README  src  target

$ mkdir -p ocp/deployments

$ cp target/undertow-servlet.jar ocp/deployments/

Log into the OpenShift instance by running the following command and providing credentials.

$ oc login

Create a new project.

$ oc new-project jdk-bin-demo

(Optional) Identify the image stream for the particular image.

$ oc get is -n openshift | grep ^redhat-openjdk | cut -f1 -d ' '
redhat-openjdk18-openshift

Create new binary build, specifying image stream and application name.

$ oc new-build --binary=true \
--name=jdk-us-app \
--image-stream=redhat-openjdk18-openshift
--> Found image c1f5b31 (2 months old) in image stream "openshift/redhat-openjdk18-openshift" under tag "latest" for "redhat-openjdk18-openshift"

    Java Applications
    -----------------
    Platform for building and running plain Java applications (fat-jar and flat classpath)

    Tags: builder, java

    * A source build using binary input will be created
      * The resulting image will be pushed to image stream "jdk-us-app:latest"
      * A binary build was created, use 'start-build --from-dir' to trigger a new build

--> Creating resources with label build=jdk-us-app ...
    imagestream "jdk-us-app" created
    buildconfig "jdk-us-app" created
--> Success

Start the binary build. Instruct oc executable to use main directory of the binary build we created in previous step as the directory containing binary input for the OpenShift build.

$ oc start-build jdk-us-app --from-dir=./ocp --follow
Uploading directory "ocp" as binary input for the build ...
build "jdk-us-app-1" started
Receiving source from STDIN as archive ...
==================================================================
Starting S2I Java Build .....
S2I source build with plain binaries detected
Copying binaries from /tmp/src/deployments to /deployments ...
... done
Pushing image 172.30.197.203:5000/jdk-bin-demo/jdk-us-app:latest ...
Pushed 0/6 layers, 2% complete
Pushed 1/6 layers, 24% complete
Pushed 2/6 layers, 36% complete
Pushed 3/6 layers, 54% complete
Pushed 4/6 layers, 71% complete
Pushed 5/6 layers, 95% complete
Pushed 6/6 layers, 100% complete
Push successful

Create a new OpenShift application based on the build.

$ oc new-app jdk-us-app
--> Found image 66f4e0b (About a minute old) in image stream "jdk-bin-demo/jdk-us-app" under tag "latest" for "jdk-us-app"

    jdk-bin-demo/jdk-us-app-1:c1dbfb7a
    ----------------------------------
    Platform for building and running plain Java applications (fat-jar and flat classpath)

    Tags: builder, java

    * This image will be deployed in deployment config "jdk-us-app"
    * Ports 8080/tcp, 8443/tcp, 8778/tcp will be load balanced by service "jdk-us-app"
      * Other containers can access this service through the hostname "jdk-us-app"

--> Creating resources ...
    deploymentconfig "jdk-us-app" created
    service "jdk-us-app" created
--> Success
    Run 'oc status' to view your app.

Expose the service as route.

$ oc get svc -o name
service/jdk-us-app

$ oc expose svc/jdk-us-app
route "jdk-us-app" exposed

Access the application.

Access the application in your browser using the URL http://jdk-us-app-jdk-bin-demo.openshift.example.com/.

Log in to the OpenShift web console.

Click on New Project, enter the details for Name, Display Name and Description fields, and then click Create.

Click on the Filter by name or description text field and type jdk to list matching templates. Click Select on the openjdk18-web-basic-s2i template.

Leave the default values, scroll to the bottom of the page and click Create. Then click Continue to Overview.

Wait for the build to finish. Once the application pod is running, access the application in your browser by clicking on the listed link (route).