OpenShift supports application deployment by using a source from GitHub and specifying an image. A build configuration file is generated for the S2I deployment in a new pod called Build Pod. In the build configuration file, you can configure the triggers needed to automate the new build process every time a condition meets the specifications you defined. After the deployment is complete, a new image with injected source code is created automatically.

Perform the following steps to deploy an application using a source from GitHub. The sample deployment uses httpd-ex as the source.

1. Log in to the OpenShift cluster:

oc login -u <user name>   

2. Create a new project by running the following command:

oc new-project <project name>   

3. Create a new application by using the GitHub source and specifying the image of which the application will be a part:

oc new-app centos/httpd-24-centos7~https://github.com/sclorg/httpd-ex.git

Note: The image is centos/httpd-24-centos7 and the GitHub source is https://github.com/sclorg/httpd-ex.git. You can obtain build logs by running oc logs -f bc/httpd-ex for this example.

4. After the image is deployed, identify all the objects that were created as part of the deployment by running the oc get all command. The following output is displayed:

Figure 12.     Sample S2I deployment status

5. Obtain triggers for this deployment by checking the YAML template of the build config:

oc get buildconfig httpd-ex -o yaml