Install Jenkins on CentOS

This post helps you to install Jenkins on CentOS server. Jenkins is an open-source Continuous Integration server written in Java. It helps us to achieve an automated CI/CD process.

Install Jenkins

The installation is pretty straightforward. You just need to download the Jenkins official repo and install Jenkins using yum. The steps are given below:

wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
yum upgrade
yum install epel-release java-11-openjdk-devel
yum install jenkins
systemctl daemon-reload

Start and enable Jenkins service

systemctl start jenkins
systemctl enable jenkins

Open the port 8080 on Firewall

Jenkins uses port 8080, so adjust the firewall using the firewall-cmd.

firewall-cmd --permanent --zone=public --add-port=8080/tcp
firewall-cmd --reload

Unlock Jenkins

After allowing the Jenkins port, access Jenkins instance by browsing to http://<IP_ADDRESS>:8080 (Replace IP_ADDRESS with your server’s IP address). Then you will get an Unlock page like below:

Install Jenkins

Read the file /var/lib/jenkins/secrets/initialAdminPassword from Jenkins instance and paste the content to Jenkins unlock screen.

[root@jenk ~]# cat /var/lib/jenkins/secrets/initialAdminPassword
91d1a68c1b5f4d1cbb4621c43c62e528
[root@jenk ~]#

Customize Jenkins

On the next page, you will be asked to install the necessary plugins. Please see the picture below:

Customize Jenkins

It is recommended to Install suggested plugins. It will install all necessary plugins that need to get the Jenkins work properly. You can always change or customize plugins later.