Install Jenkins on Linux, CentOS-7.
About Jenkins, why a DevOps engineer prefers Jenkins for CI/CD. Well, it is an open source continuous integration and continuous delivery (CI &CD) server with which organizations can automate their software development process.
This tutorial will teach you how to install and start Jenkins on Linux server.
Step-1 Update your Linux system.
sudo yum install epel-release
sudo yum update
Step 2: Install Java.
sudo yum install java-1.8.0-openjdk.x86_64
After installing Java you can verify it by running the flowing command.
java -version
This command will let you know the runtime environment of the java version.
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-b14)
OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)
Step 3: Install Jenkins.
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-
Now install the Jenkins package using yum or apt-get
sudo yum install jenkins
You can now start Jenkins service using:
sudo systemctl start jenkins
sudo systemctl enable jenkins
sudo systemctl status jenkins
Status should return in 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[1]: Starting LSB: Jenkins Automation Server...
Oct 25 12:25:54 jenkins.example.com runuser[2492]: pam_unix(runuser:session): session opened for user jenkins by (uid=0)
Oct 25 12:25:55 jenkins.example.com jenkins[2487]: Starting Jenkins [ OK ]
Oct 25 12:25:55 jenkins.example.com systemd[1]: Started LSB: Jenkins Automation Server.
Enable port 8080/tcp on the firewall to access Jenkins in web browser.
sudo firewall-cmd --add-port=8080/tcp --permanent
sudo firewall-cmd --reload
sudo firewall-cmd --list-all
Service should be listening on port 8080:
netstat -tunelp | grep 8080
tcp LISTEN 0 50 :::8080 :::*
Unblocking Jenkins.
Browse to the URL http://[serverip or hostname]:8080 to access the web installation wizard.
When you first access a new Jenkins instance, you are asked to unlock it using an automatically generated password.
The admin password is created and stored in the log file “/var/log/jenkins/jenkins.log“. Run the below command to get the password.
sudo grep -A 5 password /var/log/jenkins/jenkins.log
Copy the password and paste it in the above windows and click continue.
In the next windows Select the option: Install suggested plugins.
As we can see required plugin installation are in the process. Once plugin installation is done. It will ask to create an Admin user.
Click on save and finish.
Enjoy automating your jobs with Jenkins.
