Jenkins Installation in Linux


Jenkins is a self-contained Java-based program, ready to run out-of-the-box, with packages for Windows, Mac OS X and other Unix-like operating systems. The project was forked from Hudson after a dispute with Oracle. Runs in servlet Container(Tomcat, Glass fish). Supported by over 400 plugins. In this artical we will known about how to install Jenkins.

Jenkins requires Java to run, Before installing Jenkins make sure you have java installed on your system. Use the following  command to check the version of the installed Java.

[root@localhost ~]# java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
[root@localhost ~]#

If java doesn’t found in your machine use following method to install it.

[root@localhost ~]# cd /opt/
[root@localhost opt]#wget --no-cookies --no-check-certificate --header "Cookie:; oraclelicense=accept-securebackup-cookie"
 " "
[root@localhost opt]#tar xzf jdk-8u91-linux-x64.tar.gz
[root@localhost opt]# cd jdk1.8.0_91/
[root@localhost jdk1.8.0_91]# alternatives --install /usr/bin/java java
                               /opt/jdk1.8.0_91/bin/java 2
[root@localhost jdk1.8.0_91]# alternatives --config java

There are 4 programs which provide 'java'.

  Selection    Command
   1      /usr/lib/jvm/java-1.7.0-openjdk-
*  2      /usr/lib/jvm/java-1.8.0-openjdk-
 + 3      /opt/jdk1.7.0_79/bin/java
   4      /opt/jdk1.8.0_91/bin/java

Enter to keep the current selection[+], or type selection number: 4
[root@localhost jdk1.8.0_91]#java --version
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

The default CentOS version of Java is not compatible with Jenkins. Jenkins typically works best with a Sun implementation of Java, which is not included in CentOS for licensing reasons. so install the latest verison of java from official site. After the successful installation of java install Jenkins package

Installation of Jenkins

For the installation of Jenkins we have to add the Jenkins repository to the yum repos, by using the following commands.

[root@localhost ~]# wget -O /etc/yum.repos.d/jenkins.repo
--2016-06-03 01:06:58--
Resolving (
Connecting to (||:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 75
Saving to: ‘/etc/yum.repos.d/jenkins.repo’

100%[======================================>] 75          --.-K/s   in 0s

2016-06-03 01:07:00 (5.42 MB/s) - ‘/etc/yum.repos.d/jenkins.repo’ saved [75/75]

[root@localhost ~]# rpm --import
[root@localhost ~]# yum install jenkins
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * atomic:
 * base:
 * epel:
 * extras:
 * nux-dextop:
 * updates:
Resolving Dependencies
--> Running transaction check
---> Package jenkins.noarch 0:2.7-1.1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

 Package          Arch            Version            Repository        Size
 jenkins          noarch          2.7-1.1            jenkins           65 M

Transaction Summary
Install  1 Package

Total download size: 65 M
Installed size: 66 M
Is this ok [y/d/N]: y
Downloading packages:
No Presto metadata available for jenkins
jenkins-2.7-1.1.noarch.rpm                             |  65 MB   02:23
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : jenkins-2.7-1.1.noarch                                   1/1
  Verifying  : jenkins-2.7-1.1.noarch                                   1/1

  jenkins.noarch 0:2.7-1.1

[root@localhost ~]#

Once the installation of Jenkins completed stop firewall or add the Jenkins port in Firewall in the following way.

[root@localhost ~]# firewall-cmd --zone=public --add-port=8080/tcp --permanent
[root@localhost ~]# firewall-cmd --zone=public --add-service=http --permanent
[root@localhost ~]# firewall-cmd --reload
[root@localhost ~]# firewall-cmd --list-all
public (default, active)
  interfaces: enp2s0
  services: dhcpv6-client http ssh
  ports: 8080/tcp
  masquerade: no
  rich rules:
[root@localhost ~]#

Now we can start the Jensis Service by using systemctl as shown below

[root@localhost ~]# systemctl start jenkins
[root@localhost ~]# systemctl status jenkins
● jenkins.service - LSB: Jenkins Continuous Integration Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins)
   Active: active (running) since Fri 2016-06-03 01:27:17 EDT; 9s ago
     Docs: man:systemd-sysv-generator(8)
  Process:6488 ExecStart=/etc/rc.d/init.d/jenkins start(code=exited,status=0/SUCCESS)
   CGroup: /system.slice/jenkins.service
           └─6503 /etc/alternatives/java -Dcom.sun.akuma.Daemon=daemonize...

Jun 03 01:27:12 localhost.localdomain systemd[1]: Starting LSB: Jenkins C...
Jun 03 01:27:13 localhost.localdomain runuser[6489]: pam_unix(runuser:ses...
Jun 03 01:27:17 localhost.localdomain runuser[6489]: pam_unix(runuser:ses...
Jun 03 01:27:17 localhost.localdomain jenkins[6488]: Starting Jenkins [  ...
Jun 03 01:27:17 localhost.localdomain systemd[1]: Started LSB: Jenkins Co...
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]#

Now we can access the Jenkins webpage by using the Url: http://ipaddress of server:8080 or http://localhost:8080

jenkins homepage

You can found the password at /var/lib/jenkins/secrets/initialAdminpassword

After logged in you can found the page as follows.


jenkins start

Once you click on Start using Jenkins Button.

jenkins admin dashboard

By using the Manage Jenkin option we can set options like configure system, configure global security, Global tool configuration, manage plugins etc

jenkins configuration

Select  Configure Global Security(Second Option) check the  Enable Security Box. The page will expand to offer a choice of access control.

configure global security

Select Jenkins own user database Place a check mark next to Allow users to sign up (If you want to allow users to sign up)  In the sub section of Authorization we have options like Anyone can do anything, Legacy mode, Logged-in users can do anything and Allow anonymous read access. After all the changes do not forget to press the Save button at the bottom of the page.

Manage Plugins

On the manage Jenkins page select the manage plugin option, it opens the plugin manager.

jenkins plugin manager

Here we have options like install without restart, Download and Now Install after restart. By using this we can install the available new packages or updates for already installed plugins.

In the Next artical we will known about Jenkin Plugins in detail.

The Official Website to know more about Jenkins is here