Jenkins is an award-winning, cross-platform, continuous integration and continuous delivery application that increases your productivity. Use Jenkins to build and test your software projects continuously making it easier for developers to integrate changes to the project, and making it easier for users to obtain a fresh build.
It also allows you to continuously deliver your software by providing powerful ways to define your build pipelines and integrating with a large number of testing and deployment technologies.

Let’s start Jenkins installation steps,

1. Add the Jenkins repository to the yum repos, and install Jenkins from here.

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

sudo rpm –import https://jenkins-ci.org/redhat/jenkins-ci.org.key

sudo yum install jenkins

2. Install java, If you already installed java, omit this step

sudo yum install java

3. Start Jenkins service by using blow comments,

sudo service jenkins start/stop/restart

Or

sudo /etc/init.d/jenkins start/stop/restart

4. We have completed the Jenkins installation step.

Go to URL, http://url:8080

Jenkins default port is 8080. But, we can change this default port.