This document provides a step-by-step guide on setting up a Jenkins server, detailing essential hardware requirements and installation methods including using YUM or a .war file. It emphasizes the need to configure the server based on the number of jobs that will run simultaneously and outlines the process for checking service status and logging into the Jenkins dashboard. The tutorial concludes with recommendations for installation methods and addresses common interview questions related to Jenkins.

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How to setup jenkins step by step for
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2. How to setup Jenkins step by
step
BY DEEPAK KUMAR · PUBLISHED JULY 11, 2019 · UPDATED JULY 11, 2019
In this tutorial we are going to learn how to setup Jenkins server in our infra.
But before installation of Jenkins set your mind about required hardware for
Jenkins and how many jobs will run on your jenkins server at a time. This is
important because if you will not plan your jenkins server hardware
configuration then job execution and build process will impact on jenkins
server.
How to setup jenkins?
Pr required hardware preferred for jenkins server in production environment
RAM : 16 GB
CPU : 2 Dual cores
JAVA : Above JDK 1.8
OS : Centos/Rhel
This hardware requirement is only a basic idea which is given on official
website of jenkins. But mainly it’s depended on how many projects or job you
are running at a time. If you are running single job at time, then why 16 GB
RAM. So, it depends on need.
How to install jenkins?
There are mainly two way to install jenkins. So, it’s depended on your
requirement which one you want to follow. Here we will discuss both ways.
▪ From yum or rpm package.
▪ From .war file.
How to setup jenkins from yum repository
As you know jenkins is written in java language so its basic requirement is java
should be installed on our base machine where we are installing jenkins.
We can also install java manually by download its package from its office
website. But that is time consuming so we are installing it by yum .

3. 1 yum install java* -y
Java has been successfully installed in our base machine now check java
version.
1 java -version
Jenkins package is not available in default repository of centos or redhat. So, we
have to add jenkins EPEL. Let’s do it.
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yum install wget* -y
wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
[Click & Read:– Jenkins server and it’s basic terminology]
[Click & Read:– Aws application load balancer configuration step by
step]

4. After adding EPEL now jenkins package will be in our jenkins EPEL. So, we can
simply install it with the help of yum command.
1 yum install jenkins -y
I think you better understood how to install Jenkins server. Now just only check
service is up properly or not.
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systemctl start jenkins.service
systemctl enable jenkins.service
systemctl restart jenkins.service
systemctl status jenkins.service

5. /var/lib/jenkins is jenkins default home directory. So, have a look of it properly.
Because jenkins will put all data here and jenkins config.xml file is also available
here that we can change accordingly if required.
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cd /var/lib/jenkins/
ls
We have competed all step how to set jenkins. Now open your browser and hit
below URL from your browser. But change your server IP address according.
Also check your firewall, selinux and SG if you are using aws ec2 instance.
1 http://52.91.52.14:8080
when you will hit above URL in your browser it will prompt for default
password and will tell location where jenkins generated default password
during installation.

6. So, go to location and copy paste password and click on –> Continue
1 cat /var/lib/jenkins/secrets/initialAdminPassword
Jenkins first time login and select option . You want to install plugin
automatically or manually.

7. When required plugin will installed then create jenkins dashboard login user
name and password according to requirement.

8. Username and password for jenkins dashboard has been created. So have a look
below.
How to setup jenkins second way
The second way of jenkins installation is by jenkins.war file. But first you have
to download package from jenkins official website and then copy .war file at

9. your required location. The benefit of doing this is there is not internet
dependency on base machine and limitation of jenkins installation by yum or
rpm is only root privilege or root user can install jenkins setup. But with the
help of .war file normal user can setup jenkins without any permission issue.
Download package from below link.
1 https://jenkins.io/download/
If you are using Linux based operating system, then simple copy below link into
your terminal.
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wget http://mirrors.jenkins.io/war-stable/latest/jenkins.war
ls

10. Now let’s run jenkins.war file that we have download. You can run with the help
of nohup and & shown as fig. & sign will start jenkins service in the background
and nohup file will record all logs.
1 java -jar jenkins.war
Service of jenkins has been started via .war file. So take access from URL and
set default password.
1 http://52.91.52.14:8080

11. Now default password will generate where you have put your jenkins.war file.
Copy that file and try to login and set your desired password. Next step will be
same as above.
Conclusion
In this tutorial we have learnt how to setup jenkins server in our IT infra from
both method. We can use any method depend of our requirement. I will
recommend you use jenkins.war file for installation because we can install it
without internet and root user dependency. Still if you have any query let me
know. I will try my best to resolve them.
Interview question on Jenkins
1. How to check jenkins version
2. What is hardware requirement for jenkins server?
3. What is jenkins home directory?

12. 4. How we will take backup of jenkins if required?
5. Can we install jenkins without internet if yes how?
6. What is daily routine use cases of jenkins in your infra ?