How to install and Configure Jenkins on CentOS 7 and RHEL 7

Jenkins is free and open source continues integration tool and it’s code is written in Java. It provides the feature of continues build and deployment or in other words we can say it is a automation server. Jenkins are used where continues build and integration is going on for software development.

In this post i will discuss how to install and configure Jenkins on CentOS 7 and RHEL 7.

Step:1 Add Jenkins Repository

Jenkins package is not available in the default CentOS and RHEL repositories. So we need to add jenkins repository using the beneath commands.

[root@jenkins ~]# wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins.io/redhat-stable/jenkins.repo
[root@jenkins ~]# rpm --import http://pkg.jenkins.io/redhat-stable/jenkins.io.key

Step:2 Install Jenkins and Java

Run the below yum command to install Jenkins and java.

[root@jenkins ~]# yum install jenkins java-1.7.0-openjdk –y

Step:3 Start and Enable Jenkins Service

Run the following systemctl commands to start and enable the jenkins service

[root@jenkins ~]# systemctl start jenkins
[root@jenkins ~]# systemctl enable jenkins

Step:4 Open the ports (80 and 8080) in OS firewall.

In case firewall is enabled on your Linux server then run the following commands to open jenkins related ports like 80 and 8080.

[root@jenkins ~]# firewall-cmd --zone=public --add-port=8080/tcp --permanent
success
[root@jenkins ~]# firewall-cmd --zone=public --add-service=http --permanent
success
[root@jenkins ~]# firewall-cmd --reload
success
[root@jenkins ~]#

Step:5 Access the Jenkins Web portal

Access the URL : http://<Ip-Address-of-your-Server>:8080

Admin password is created and stored in the log file “/var/log/jenkins/jenkins.log“. Run the below command to get the password.

[root@jenkins ~]# grep -A 5 password /var/log/jenkins/jenkins.log

Copy the password and paste it in above windows and click on Continue..

In the next windows Select the option : Install suggested plugins

As we can see required plugin installation is in progress for Jenkins. Once it is done with plugin installation. It will ask to create Admin User

Click on Save and Finish

click on “Start using Jenkins”

Now Configure GitHub project using git plugin in Jenkins.

Let’s Assume I have a ‘cloudtechi’ project on GitHub and wants to integrate this project in Jenkins using git plugin.

Let’s first install git package on your machine on which you have installed Jenkins because Jenkins use git command to pull the GitHub project code.

[root@jenkins ~]# yum install git

Select the Freestyle Project and Specify the name as per your setup, In my case I putting as “techi_project”

Click on OK

Specify the Project Description and Select Git option in Source Code Management Tab and specify the Web URL of your GitHub Project and its credentials. In the Build Tab select the option that suits your setup and then finally click on Apply.

GitHub-Project-Credentials-Jenkins-Centos7

In the Next step click on the “Build Now” option from Jenkins Dashboard to pull the GitHub Project Code.

Click on the Workspace Option to view Code or files of GitHub Project. Whenever a new code is pushed on the GitHub project it will be automatically push to Jenkins workspace with new versions.

we can also view the project workspace from terminal as well.

[root@jenkins ~]# cd /var/lib/jenkins/workspace/techi_project/
[root@jenkins techi_project]# ls -l
total 12
-rw-r--r--. 1 jenkins jenkins 63 Aug  7 03:23 cloudstack
-rw-r--r--. 1 jenkins jenkins 13 Aug  7 03:23 README.md
-rw-r--r--. 1 jenkins jenkins 84 Aug  7 03:23 testing.md
[root@jenkins techi_project]#

We can this code to deploy on other machines as well. That’s all, Basic Jenkins installation and configuration is completed ..