Setting up a Continuous Integration Environment with Jenkins and Docker PART 1.

As a proof of concept I was tasked with setting up a continuous integration environment using Jenkins, Docker, Maven, Artifactory, GIT, and a JDK 1.7 web application running on Tomcat. Additional requirements included using our own local Docker Hub and Docker Index. Final deployment will be to the cloud either AWS or Microsoft's Azure.

I began by creating four identical CENTOS Virtual Machines.  I probably didn't need 4 separate servers however I figured I would end up making mistakes and have to rebuild one or more of the servers during the project. Our lab environment has large servers runing VMware. I created the following four virtual servers.

1. DockerJenkins
2. DockerGIT
3. DockerHub
4. DockerArtifactory

I began by setting up the Jenkins Server.

Step 1) Add the Jenkins RPM repository to yum configuration, then install Jenkins

# wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo

# rpm --import http://pkg.jenkins-ci.org/redhat/jenkins-ci.org.key

# yum install jenkins

....Lots of output .... 

Step 2) Verify Jenkins is installed and setup as a service.

# chkconfig --list jenkins
jenkins         0:off   1:off   2:off   3:on    4:off   5:on    6:off

# service jenkins
Usage: /etc/init.d/jenkins {start|stop|status|try-restart|restart|force-reload|reload|probe}

Step 3) Start Jenkins

# service jenkins start

Starting Jenkins bash: /usr/bin/java: No such file or directory

                                                           [FAILED]

OOPS we didn't install java.

Lets see what's available

# yum list available | grep java.

.... Lots of output here ...

# yum  install java-1.7.0-openjdk 

....Lots more output here  ...

Lets check to see if we've actually installed Java

# java -version

java version "1.7.0_71"

OpenJDK Runtime Environment (rhel-2.5.3.1.el6-x86_64 u71-b14)

OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

Now lets start Jenkins

# service jenkins start

Starting Jenkins                                           [  OK  ]

Lets make sure Jenkins is up and running. Open a browser and navigate to your server, port 8080.

WooHoo We did it!!!

In PART 2 we will discuss setting up a server to host GIT.