This is a short blog post on the installation of Jenkins Server on CentOS 7. Jenkins is an open source automation server written in Java that was designed to automate repetitive tasks that are often encountered in continuous integration and delivery of software.
For Ubuntu, see: How to Install Jenkins on Ubuntu 18.04
For Arch Linux: How to Install and Configure Jenkins on Arch Linux
For Docker Container: Running Jenkins Server in Docker Container with Systemd
Minimum Hardware requirements:
- 256 MB of RAM, 1 GB+ recommended
- 1 GB of drive space (although 10 GB is a recommended minimum if running Jenkins as a Docker container)
Install Jenkins on CentOS 7
Jenkins requires Java in order to run, but CentOS 7 doesn’t include it by default. To install the Open Java Development Kit (OpenJDK) run the following:
sudo yum -y install epel-release sudo yum install java-1.8.0-openjdk
Check to make sure that you have java installed by running:
$ java -version openjdk version "1.8.0_191" OpenJDK Runtime Environment (build 1.8.0_191-b12) OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)
Start by importing the repository key from Jenkins
sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
After importing the key, add the repository to the system
sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo
Then install Jenkins package using
sudo yum install jenkins
If you need the LTS release only, run the following commands instead:
sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key sudo yum install jenkins
You can now start Jenkins service using:
sudo systemctl start jenkins
A check on status should return running state
$ sudo systemctl status jenkins ● jenkins.service - LSB: Jenkins Automation Server Loaded: loaded (/etc/rc.d/init.d/jenkins; bad; vendor preset: disabled) Active: active (running) since Thu 2018-10-25 12:25:55 EAT; 4s ago Docs: man:systemd-sysv-generator(8) Process: 2487 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=0/SUCCESS) CGroup: /system.slice/jenkins.service └─2508 /etc/alternatives/java -Dcom.sun.akuma.Daemon=daemonized -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/j... Oct 25 12:25:54 jenkins.example.com systemd: Starting LSB: Jenkins Automation Server... Oct 25 12:25:54 jenkins.example.com runuser: pam_unix(runuser:session): session opened for user jenkins by (uid=0) Oct 25 12:25:55 jenkins.example.com jenkins: Starting Jenkins [ OK ] Oct 25 12:25:55 jenkins.example.com systemd: Started LSB: Jenkins Automation Server.
8080/tcp on the firewall
sudo firewall-cmd --add-port=8080/tcp --permanent sudo firewall-cmd --reload sudo firewall-cmd --list-all
The service should be listening on port
# ss -tunelp | grep 8080 tcp LISTEN 0 50 :::8080 :::* users:(("java",pid=2508,fd=163)) uid:994 ino:1661983 sk:ffff91ce2a84a100 v6only:0 <->
Browse to the URL
http://[serverip|hostname]:8080 to access web installation wizard.
When you first access a new Jenkins instance, you are asked to unlock it using an automaticallygenerated password.
Get the password from
$ cat /var/lib/jenkins/secrets/initialAdminPassword 75a6155d70b7435c9b382197c823aa35
Copy-paste the automatically-generated alphanumeric password into the Administrator password field and click Continue.
In the next page, install recommended plugins or plugins that suit your desired Jenkins usage. if not sure, select installation of recommended plugins.
Next is to create an admin user account used to manage the Jenkins server.
After a successful installation, you’ll get to Jenkins Management console.
Enjoy automating your jobs with Jenkins. For more reading, check Official Documentation.