Learning by Experience: Installing Jenkins in CentOS 7

Wednesday, June 27, 2018

Installing Jenkins in CentOS 7

There are two basic ways to install Jenkins on CentOS: through a repository, or repo, and via the WAR file. Installing from a repo is the preferred method, and it's what we'll outline first.

$ java -version
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-b10)
OpenJDK 64-Bit Server VM (build 25.171-b10, mixed mode)

Jenkins Version:
jenkins-2.129

Installing from the Repo

Now, run the following to download Jenkins from the Red Hat repo:

$ sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo

The wget tool downloads files into the filename specified after the "O" flag (that's a capital 'O', not a zero).

Then, import the verification key using the package manager RPM:


sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key

Finally, install Jenkins by running:


sudo yum install jenkins

That's it! You should now be able to start Jenkins as a service:


sudo systemctl start jenkins.service

Once the service has started, you can check its status:


sudo systemctl status jenkins.service

his will give you a fairly lengthy readout with a lot of information on how the process started up and what it's doing, but if everything went well, you should see two lines similar to the following:

Loaded: loaded (/etc/systemd/system/jenkins.service; disabled)
Active: active (running) since Tue 2015-12-29 00:00:16 EST; 17s ago

This means that the Jenkins services completed its startup and is running. You can confirm this by visiting the web interface as before, at http://ip-of-your-machine:8080.

You might see a screen like below :

Run the bellow command and get the password:

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

Select Install suggested plugins.

It will install the recommended plug-ins

Now Create the Admin user and click Save and continue

You can give a Custom Url:

Done!