How to install Jenkins on Redhat EC2 Server

 Step 1:  Download below repo

[root@ip-172-31-18-18 ~]# sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo

--2025-09-03 10:08:33--  https://pkg.jenkins.io/redhat-stable/jenkins.repo

Resolving pkg.jenkins.io (pkg.jenkins.io)... 146.75.38.133, 2a04:4e42:56::645

Connecting to pkg.jenkins.io (pkg.jenkins.io)|146.75.38.133|:443... connected.

HTTP request sent, awaiting response... 200 OK

Length: 85

Saving to: ‘/etc/yum.repos.d/jenkins.repo’

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

2025-09-03 10:08:33 (2.71 MB/s) - ‘/etc/yum.repos.d/jenkins.repo’ saved [85/85]

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Step 2:  Download key

[root@ip-172-31-18-18 ~]# sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key

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Step 3:-  Install java

[root@ip-172-31-18-18 ~]# sudo yum install fontconfig java-21-openjdk

Updating Subscription Management repositories.

Unable to read consumer identity

This system is not registered with an entitlement server. You can use "rhc" or "subscription-manager" to register.

Last metadata expiration check: 0:03:37 ago on Wed Sep  3 10:08:57 2025.

Package fontconfig-2.15.0-7.el10.x86_64 is already installed.

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Step 4:- Install Jenkin now

[root@ip-172-31-18-18 ~]# sudo yum install jenkins

Updating Subscription Management repositories.

Unable to read consumer identity

This system is not registered with an entitlement server. You can use "rhc" or "subscription-manager" to register.

Last metadata expiration check: 0:03:58 ago on Wed Sep  3 10:08:57 2025.

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Step 5:-  Start the Jenkins

[root@ip-172-31-18-18 ~]# sudo systemctl daemon-reload

[root@ip-172-31-18-18 ~]# sudo systemctl enable jenkins

Created symlink '/etc/systemd/system/multi-user.target.wants/jenkins.service' → '/usr/lib/systemd/system/jenkins.service'.

[root@ip-172-31-18-18 ~]# sudo systemctl start jenkins

[root@ip-172-31-18-18 ~]# sudo systemctl status jenkins

● jenkins.service - Jenkins Continuous Integration Server

     Loaded: loaded (/usr/lib/systemd/system/jenkins.service; enabled; preset: disabled)

     Active: active (running) since Wed 2025-09-03 10:13:52 UTC; 19s ago

 Invocation: 7cec58f4a86b4ad98baa29275db3c9f4

   Main PID: 14143 (java)

      Tasks: 42 (limit: 5687)

     Memory: 452.6M (peak: 462.1M)

        CPU: 14.054s

     CGroup: /system.slice/jenkins.service

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Step 6:-  Now access the Jenkings by using public ip and port 8080

http://52.90.54.118:8080/

/var/lib/jenkins/secrets/initialAdminPassword