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Install Jenkins using Docker

Step 1: Installing Docker
# apt-get install docker (Ubuntu)
# yum install docker  (RHEL/CENTOS)
 
For more info, please following this http://www.scmgalaxy.com/scm/software-containers/how-to-install-docker-in-linux.html
 
Step 2:  First, pull the official jenkins image from Docker repository.
# docker pull jenkins
 
Step 3: Next, run a container using this image and map data directory from the container to the host; e.g in the example below /var/jenkins_home from the container is mapped to jenkins/ directory from the current path on the host. Jenkins 8080 port is also exposed to the host as 49001.

 
Mapping port 8080 on the host to the container (the web ui), port 50000 to port 50000 (for build agents). Run with `-p 50000:50000` so you can connect JNLP slaves. For port 50000. This is to handle connections from JNLP based build slaves. This will store the workspace in /var/jenkins_home. All Jenkins data lives in there including plugins and configuration.

> docker run -d -p 8080:8080 -p 50000:50000 jenkins
 
This will store the jenkins data in /your/home on the host. Ensure that /your/home is accessible by the jenkins user in container (jenkins user - uid 1000) or use -u some_other_user parameter with docker run.
> docker run -d -p 8080:8080 -p 50000:50000 -u root -v $PWD/jenkins:/var/jenkins_home jenkins 
 
 
Other Example:
docker run -d -p 49001:8080 -v $PWD/jenkins:/var/jenkins_home -t jenkins -u root

This will store the jenkins data in /your/home on the host. Ensure that /your/home is accessible by the jenkins user in container (jenkins user - uid 1000) or use -u some_other_user parameter with docker run. This information is also found in the Dockerfile. So all you need to do is to ensure that the directory $PWD/jenkins is own by UID 1000:
 
> mkdir jenkins
> chown 1000 jenkins
> docker run -d -p 49001:8080 -v $PWD/jenkins:/var/jenkins_home -t jenkins
 
How to see the Jenkins log?
> docker exec name tail -f /var/log/jenkins/jenkins.log
Where name = --name

Step 3:  Access to j=Jenkins
As we have successfully run Jenkins Container, we can browse Jenkins Web Interface using our Web Browser by pointint to http://ip-address:49001 or http://localhost:49001 according to the configuration.
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Rajesh Kumar

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Total, Over 12 years of extensive experience in the Software Configuration Management domain having depth knowledge of DevOps, Continuous Integration and Delivery, Configuration Management, Build and Installer, Release Management and Application Management.

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