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How to install Jenkins in Linux

Installation of Jenkins in Linux

Jenkins is an open source Java-based program with the packages for Windows, Mac OS X and other Linux operating systems. It runs in servlet Container(Tomcat, Glass fish) and is supported by more than 400 plugins. Installation of Jenkins is explained in this tutorial.

Run the command and check the version of java available in the system.

[root@linuxhelp1 ~]# java -version
java version " 1.7.0_51" 
OpenJDK Runtime Environment (rhel-2.4.5.5.el7-x86_64 u51-b31)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)

To Install Jenkins

Enable the Jenkins repository

[root@linuxhelp1 ~]# wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo
--2016-07-06 04:37:47--  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      

2016-07-06 04:37:48 (10.8 MB/s) - ‘ /etc/yum.repos.d/jenkins.repo’  saved [71/71]

Use the following command to download the key.

[root@linuxhelp1 ~]# rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key

Install the Jenkins by using the following command.

[root@linuxhelp1 ~]# yum install jenkins -y
Loaded plugins: fastestmirror, langpacks
Determining fastest mirrors
 * base: centos.webwerks.com
 * extras: download.nus.edu.sg
 * updates: centos.webwerks.com
Resolving Dependencies
-->  Running transaction check
--->  Package jenkins.noarch 0:2.11-1.1 will be installed
.
.
.
Installed:
  jenkins.noarch 0:2.11-1.1                                                                                                          

Complete!

Once the installation of Jenkins completed add the Jenkins port to the Firewall as shown below.

[root@linuxhelp1 ~]# firewall-cmd --zone=public --add-port=8080/tcp --permanent
success
[root@linuxhelp1 ~]# firewall-cmd --zone=public --add-service=http --permanent
success
[root@linuxhelp1 ~]# firewall-cmd --reload
success
[root@linuxhelp1 ~]# firewall-cmd --list-all
public (default, active)
  interfaces: eno16777736
  sources:
  services: dhcpv6-client http ssh
  ports: 8080/tcp
  masquerade: no
  forward-ports:
  icmp-blocks:
  rich rules:

Start and check the status of the jenkins

[root@linuxhelp1 ~]# systemctl start jenkins
[root@linuxhelp1 ~]# systemctl status jenkins
jenkins.service - LSB: Jenkins Continuous Integration Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins)
   Active: active (running) since Wed 2016-07-06 04:44:45 IST  19s ago
  Process: 43687 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/jenkins.service
           ??43702 java -Dcom.sun.akuma.Daemon=daemonized -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/j...

Jul 06 04:44:43 linuxhelp1 runuser[43688]: pam_unix(runuser:session): session opened for user jenkins by (uid=0)
Jul 06 04:44:45 linuxhelp1 jenkins[43687]: Starting Jenkins [  OK  ]
Jul 06 04:44:45 linuxhelp1 systemd[1]: Started LSB: Jenkins Continuous Integration Server.

Open the browser and type http://< IP_address> :8080 or http://localhost:8080

Copy the path " /var/lib/jenkins/secrets/initialAdminpassword" in the home page and paste it in the terminal using your favourite editor to get the password.

[root@linuxhelp1 ~]# vim /var/lib/jenkins/secrets/initialAdminPassword
Bf30da956e2145178b84e950d3572608

Paste the password in the box. In setup wizard and choose “ install suggested plugins" .

Setup installation starts.

Create admin user by entering the user details and click " Save and Finish"

Click Start using Jenkins to explore Jenkins.


The dashboard of Jenkins appears.

Manage Jenkin option is used to configure system, configure global security, Global tool configuration, manage plugins etc

Select Configure Global Security to Enable Security and click Save to apply changes.

For managing plugin click on Manage plugin option.

Tag : Apache tomcat Java Plugins Jenkins Glassfish
FAQ
Q
What is the difference between Maven, Ant and Jenkins?
A
Maven and Ant are Build Technologies whereas Jenkins is a continuous integration tool.
Q
Which SCM tools Jenkins supports?
A
Below are Source code management tools supported by Jenkins:

AccuRev
CVS,
Subversion,
Git,
Mercurial,
Perforce,
Clearcase
RTC
Q
How to move or copy Jenkins from one server to another?
A
I will approach this task by copying the jobs directory from the old server to the new one. There are multiple ways to do that, I have mentioned it below:

You can:

Move a job from one installation of Jenkins to another by simply copying the corresponding job directory.
Make a copy of an existing job by making a clone of a job directory by a different name.
Rename an existing job by renaming a directory. Note that if you change a job name you will need to change any other job that tries to call the renamed job.
Q
what are the commands to start Jenkins manually?
A
For this answer I will suggest you to go with the below mentioned flow:



To start Jenkins manually open Console/Command line, then go to your Jenkins installation directory. Over there you can use the below commands:



To start Jenkins: jenkins.exe start

To stop Jenkins: jenkins.exe stop

To restart Jenkins: jenkins.exe restart
Q
What is continuous integration in Jenkins?
A
In software development, multiple developers or teams work on different segments of same web application so you have to perform integration test by integrating all modules. In order to do that an automated process for each piece of code is performed on daily bases so that all your codes get tested. This process is known as continuous integration.