How to install Jenkins On CentOS 8

Jenkins Installation on CentOS 8 : Step-by-Step Guide

Introduction

Looking to streamline your software development and deployment processes? Jenkins, an open-source automation server, can be your go-to tool. In this step-by-step guide, we’ll walk you through the process of installing Jenkins on CentOS 8, enabling you to automate your build, test, and deployment tasks efficiently. Let’s dive in!

Prerequisites

Jenkins is free and the most popular open-source for automation server. It is used to automate the parts of software development related to building, testing, and deploying, facilitating continuous integration and continuous delivery (CI/CD) pipeline. It supports version control tools, including AccuRev, CVS, Subversion, Git, Mercurial, Perforce, ClearCase and RTC, and can execute Apache Ant, Apache Maven and sbt based projects as well as arbitrary shell scripts and Windows batch commands.

Before you begin the installation process, ensure that you have the following prerequisites in place:

  1. CentOS 8 server with administrative access
  2. Java Development Kit (JDK) installed (version 8 or higher)
  3. A stable internet connection

1. Installing Java Development Kit (JDK)

To run Jenkins, you’ll need to install the Java Development Kit. Follow these steps to install JDK on CentOS 8:

Step 1: Update System Packages
sudo dnf update
Step 2: Install OpenJDK
sudo dnf install java-1.8.0-openjdk-devel
Step 3: Verify the Java Installation
java -version

Output :

[ramans@otodiginet ~]$ java -version
openjdk version "11.0.8" 2020-07-14 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.8+10-LTS)

2. Jenkins Installation

Now that we have Java installed, let’s proceed with installing Jenkins:

Step 1: Import Jenkins Repository Key
sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
Step 2: Add Jenkins Repository
$ sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo

Output :

[ramans@otodiginet ~]$ sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
[sudo] password for ramans: 
--2020-12-22 18:58:03-- https://pkg.jenkins.io/redhat-stable/jenkins.repo
Resolving pkg.jenkins.io (pkg.jenkins.io)... 151.101.10.133, 2a04:4e42:2::645
Connecting to pkg.jenkins.io (pkg.jenkins.io)|151.101.10.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 85
Saving to: ‘/etc/yum.repos.d/jenkins.repo’

/etc/yum.repos.d/jenkins. 100%[===================================>] 85 --.-KB/s in 0s

2020-12-22 18:58:04 (1.56 MB/s) - ‘/etc/yum.repos.d/jenkins.repo’ saved [85/85]
Step 3: Install Jenkins
$ sudo dnf install jenkins

Output :

[ramans@otodiginet ~]$ sudo dnf install jenkins
Jenkins-stable 18 kB/s | 19 kB 00:01
Last metadata expiration check: 0:00:01 ago on Tue 22 Dec 2020 06:59:11 PM PST.
Dependencies resolved.
======================================================================================================
Package Architecture Version Repository Size
======================================================================================================
Installing:
jenkins noarch 2.263.1-1.1 jenkins 64 M

Transaction Summary
======================================================================================================
Install 1 Package

Total download size: 64 M
Installed size: 64 M
Is this ok [y/N]: y
Downloading Packages:
jenkins-2.263.1-1.1.noarch.rpm 87 kB/s | 64 MB 12:30
------------------------------------------------------------------------------------------------------
Total 87 kB/s | 64 MB 12:30
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Running scriptlet: jenkins-2.263.1-1.1.noarch 1/1
Installing : jenkins-2.263.1-1.1.noarch 1/1
Running scriptlet: jenkins-2.263.1-1.1.noarch 1/1
Verifying : jenkins-2.263.1-1.1.noarch 1/1
Installed products updated.

Installed:
jenkins-2.263.1-1.1.noarch

Complete!
Step 4: Start Jenkins Service
$ sudo systemctl start jenkins
Step 5: Enable Jenkins Service to Start on Boot
$ sudo systemctl enable jenkins

Output :

[ramans@otodiginet ~]$ sudo systemctl enable jenkins
jenkins.service is not a native service, redirecting to systemd-sysv-install.
Executing: /usr/lib/systemd/systemd-sysv-install enable jenkins
Step 6: Checking Jenkins Service Status
$ sudo systemctl status jenkins

Output :

[ramans@otodiginet ~]$ sudo systemctl status jenkins
● jenkins.service - LSB: Jenkins Automation Server
Loaded: loaded (/etc/rc.d/init.d/jenkins; generated)
Active: active (running) since Tue 2020-12-22 19:20:14 PST; 15s ago
Docs: man:systemd-sysv-generator(8)
Tasks: 32 (limit: 49614)
Memory: 246.8M
CGroup: /system.slice/jenkins.service
└─6996 /etc/alternatives/java -Dcom.sun.akuma.Daemon=daemonized -Djava.awt.headless=true ->

Dec 22 19:20:12 otodiginet systemd[1]: Starting LSB: Jenkins Automation Server...
Dec 22 19:20:13 otodiginet runuser[6975]: pam_unix(runuser:session): session opened for user jenkins >
Dec 22 19:20:14 otodiginet runuser[6975]: pam_unix(runuser:session): session closed for user jenkins
Dec 22 19:20:14 otodiginet jenkins[6968]: Starting Jenkins [ OK ]
Dec 22 19:20:14 otodiginet systemd[1]: Started LSB: Jenkins Automation Server.

3. Configuring Jenkins

Now that Jenkins is installed on our CentOS 8 system, let’s configure it:

Step 1: Access Jenkins Web Interface

Open your web browser and enter http://<your-server-IP>:8080 in the address bar.

Step 2: Unlock Jenkins

Retrieve the initial administrator password by executing the following command:

$ sudo more /var/lib/jenkins/secrets/initialAdminPassword

Output :

[ramans@otodiginet ~]$ sudo more /var/lib/jenkins/secrets/initialAdminPassword
[sudo] password for ramans: 
d4ee060068484324ad56b73c0795ed66

Copy the password and paste it into the Jenkins web interface.

Jenkins_Unlock

Step 3: Install Recommended Plugins

Choose the “Install suggested plugins” option to install the recommended plugins.

Jenkins_Install_PlugsIn

Jenkins plugsin
Step 4: Create an Admin User

Provide the required information to create an admin user for Jenkins.

Jenkins_Admin_User

Step 5: Configure Jenkins URL

Specify the URL for Jenkins to use. Use the default URL if you’re accessing Jenkins directly via IP.

Jenkins_URL

5: Jenkins Installation Completion

Congratulations! We have successfully installed Jenkins on CentOS 8. Here are a few final steps to wrap up the installation:

Step 1: Start Using Jenkins

Click on the “Start using Jenkins” button to access the Jenkins dashboard.

Start using Jenkins

Step 2: Install Additional Plugins (optional)

Explore the Jenkins dashboard to install additional plugins according to your project requirements.

Conclusion

By following this step-by-step guide, you have learned how to install Jenkins on CentOS 8 and configure it for your software development needs. Jenkins provides a powerful platform for automating build, test, and deployment processes, enabling you to streamline your workflows and enhance efficiency. Get started with Jenkins today and revolutionize your software development practices!

Remember to regularly update and secure your Jenkins installation to ensure optimal performance and stability. Happy automating!

 


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