##Experimenting with Jenkins and Continuous Integration for Infrastructure##

The example Docker Files are used as part of two Jenkins Build Pipleines, based on RHEL6 and RHEL7 core OS/Infrastructure. We have grouped the supporting Docker files in the rhel6 and rhel7 branches. In our example, our use case is a complete OS/Platform/Application stack. We have created the supporting Docker file/image geneology such that we can automate the testing of any change at any point in the stack via Jenkins, Docker File/Images Builds, and Linux containers for multiple versions of the stack. The logical geneology of the Docker Images and Build pipeline are as follows:

RHEL Base -> Java JDK -> JBoss EAP -> Web App -> Final Docker Image/Container for Execution

Additionally, we have created a similar logical geneology for Docker Images/Containers that can be used as Jenkins Build Slaves:

RHEL Base -> Java JDK -> Maven + Utilities -> Final Docker Image/Container for Jenkins Build Slave

Here's the Docker File/Image Geneology for a RHEL6/JDK1.6 application stack from the rhel6 branch:

rhel6-latest - Base Red Hat RHEL6 OS, with yum update

-->jdk1.6-rhel6 - Installs jdk1.6 and some supporting utilities with yum

---->eap-jdk1.6-rhel6 - Installs JBoss EAP onto image from a .zip deployment

------>helloworld-eap-jdk1.6-rhel6 - Adds a "hello world" app to the EAP deployment directory

Here's the Docker File/Image Geneology for a RHEL6/JDK1.6 Jenkins Slave stack from the rhel6 branch:

rhel6-latest - Base Red Hat RHEL6 OS, with yum update

-->jdk1.6-rhel6 - Installs jdk1.6 and some supporting utilities with yum

---->mvnbld-jdk1.6-rhel6 - Installs Maven and some supporting utilities with yum

Assuming you're using RHEL7 as your Docker host OS, your Docker Images created will pickup the host's subscribed entitlements, enabling you to seamlessly use yum as part of your image builds like in our examples. Many may already be aware of this, but you can run a Docker Container using a any RHEL base OS (eg. 5,.X 6.X, 7.X) on any RHEL Host OS that supports Docker, which provides a great method for testing out OS, System Utility, Platform, and Application changes.

We have orchestrated the Docker Images Builds and Container execution via Jenkins, and a complete RHEL 6 Infrastructure Build Pipleline example is below: