This repository contains Dockerfiles for a Jenkins Docker image intended for use with OpenShift v3

For an example of how to use it, see this sample.

The image is pushed to DockerHub as openshift/jenkins-1-centos7.

Jenkins versions currently provided are:

• jenkins-1.6x

RHEL versions currently supported are:

• RHEL7

CentOS versions currently supported are:

• CentOS7

Choose either the CentOS7 or RHEL7 based image:

• RHEL7 based image

  To build a RHEL7 based image, you need to run Docker build on a properly subscribed RHEL machine.

  $ git clone https://github.com/openshift/jenkins.git
  $ cd jenkins
  $ make build TARGET=rhel7 VERSION=1
  

• CentOS7 based image

  This image is available on DockerHub. To download it run:

  $ docker pull openshift/jenkins-1-centos7
  

  To build a Jenkins image from scratch run:

  $ git clone https://github.com/openshift/jenkins.git
  $ cd jenkins
  $ make build VERSION=1
  

Notice: By omitting the VERSION parameter, the build/test action will be performed on all provided versions of Jenkins. Since we are currently providing only version 1, you can omit this parameter.

The image recognizes the following environment variables that you can set during initialization by passing -e VAR=VALUE to the Docker run command.

You can also set the following mount points by passing the -v /host:/container flag to Docker.

Notice: When mouting a directory from the host into the container, ensure that the mounted directory has the appropriate permissions and that the owner and group of the directory matches the user UID or name which is running inside the container.

In order to install additional Jenkins plugins, the OpenShift Jenkins image provides a way how to add those by layering on top of this image. The derived image, will provide the same functionality as described in this documentation, in addition it will also include all plugins you list in the plugins.txt file.

To create derived image, you have to write following Dockerfile:

FROM openshift/jenkins-1-centos7
COPY plugins.txt /opt/openshift/configuration/plugins.txt
RUN /usr/local/bin/plugins.sh /opt/openshift/configuration/plugins.txt

The format of plugins.txt file is:

pluginId:pluginVersion

For example, to install the github Jenkins plugin, you specify following to plugins.txt:

github:1.11.3

After this, just run docker build -t my_jenkins_image -f Dockerfile.

Furthermore, there are now 2 plugins of note included in this Jenkins Docker image that specifically facilitate the creation of CI/CD jobs and workflows for OpenShift v3:

• OpenShift Pipeline plugin

  See the following, as well an example use of the plugin's capabilities with the OpenShift Sample Job included in this image.

• Kubernetes plugin

  See the following, as well as the examples for constructing Jenkins masters and slaves that interact with OpenShift v3

For this, we will assume that you are using the openshift/jenkins-1-centos7 image. If you want to set only the mandatory environment variables and store the database in the /tmp/jenkins directory on the host filesystem, execute the following command:

$ docker run -d -e JENKINS_PASSWORD=<password> -v /tmp/jenkins:/var/lib/jenkins openshift/jenkins-1-centos7

The admin user name is set to admin and you have to to specify the password by setting the JENKINS_PASSWORD environment variable. This process is done upon initialization.

This repository also provides a test framework which checks basic functionality of the Jenkins image.

Users can choose between testing Jenkins based on a RHEL or CentOS image.

• RHEL based image

  To test a RHEL7 based Jenkins image, you need to run the test on a properly subscribed RHEL machine.

  $ cd jenkins
  $ make test TARGET=rhel7 VERSION=5.5
  

• CentOS based image

  $ cd jenkins
  $ make test VERSION=1
  

Notice: By omitting the VERSION parameter, the build/test action will be performed on all provided versions of Jenkins. Since we are currently providing only version 1, you can omit this parameter.