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Jenkins installation and configuration

 Here is step by step detail of Jenkins installation and configuration along with screen shot.

Step:Install repo

 yum -y install epel-release

Step:Install java
# yum install java-1.8.0-openjdk

Step check java


[root@localhost ~]# java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-b10)

Step:Start by importing the repository key from Jenkins

[root@localhost ~]# rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key

Step:After importing the key, add the repository to the system

[root@localhost ~]# yum -y install wget

[root@localhost ~]# wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo

output.

--2019-09-21 10:21:59--  http://pkg.jenkins-ci.org/redhat/jenkins.repo

Resolving pkg.jenkins-ci.org (pkg.jenkins-ci.org)... 52.202.51.185

Connecting to pkg.jenkins-ci.org (pkg.jenkins-ci.org)|52.202.51.185|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 71

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

100%[============================================================================================================>] 71          --.-K/s   in 0s      

2019-09-21 10:22:00 (4.99 MB/s) - ‘/etc/yum.repos.d/jenkins.repo’ saved [71/71]

Step

[root@localhost ~]# yum -y install jenkins

[root@localhost ~]# systemctl start jenkins

[root@localhost ~]# systemctl enable --now jenkins

Step:Enable port 8080/tcp on the firewall

[root@localhost ~]# firewall-cmd --add-port=8080/tcp --permanent

[root@localhost ~]# firewall-cmd --reload

[root@localhost ~]# firewall-cmd --list-all

[root@localhost ~]# ss -tunelp | grep 8080

output

[root@localhost ~]# ss -tunelp | grep 8080

tcp    LISTEN     0      50       :::8080                 :::*                   users:(("java",pid=13674,fd=159)) uid:987 ino:55044 sk:ffffa0ca7ac318c0 v6only:0 <->

Step:Unlock

[root@localhost ~]# cd /var/lib/jenkins/

[root@localhost jenkins]# cd secrets/

[root@localhost secrets]# ls

[root@localhost secrets]# vim initialAdminPassword

Copy the password and paste on password index

output:

Step click on install suggested plugin.

output

It will take some time after that

Step:create an admin user account used to manage the Jenkins server.

Then it will appear url page 

Save and Finish.

Start using Jenkins.

Now we can use Jenkins,we can use git and local repository as well
I am going to create my first project in Jenkins,for that i have create java hello world.
 $ mkdir java-application
$cd java-application/
~/java-application$ sudo vim hello world.java
Copy the hello world code from google and paste 
Then compile.
~/java-application$ javac helloworld.java

Create job
Click on create Job in Jenkins

"Then enter hello world on enter an item name here" and select free style project.

Then Click on ok

In new window provide description like run and build java
I will not choose any below option and move to next configuration"source code management"
and chose none

Then in build trigger,choose ***** see detail in arrow next.

In build environment leave blank

In "Build"

This is path of code and task detail we can ask Jenkins to perform.like I ask Jenkins to compile my file and run code,