An Introduction To Jenkins

An Introduction To Jenkins
Presented By :
Prashant Sharma
Software Consultant
Knoldus Software LLP

Agenda
●What is Jenkins - an Introduction.
●What is Continuous Integration.
●Installing and Configuring Jenkins.
●Managing Security.
●Creating a job with Jenkins.
●Hands on CI with Jenkins.
●References.

What is Jenkins - an Introduction
● Jenkins is the leading open source continuous integration tool.
● Jenkins was originally developed as the Hudson project. Hudson's
creation started in summer of 2004 at Sun Microsystems.
● In November 2010, an issue arose in the Hudson community with respect
to the infrastructure used. Negotiations were held between the principal
project contributors and Oracle; a key sticking point was the control of the
name "Hudson" itself, which Oracle claimed, and on January 11, 2011, a
proposal was made to change the project name from "Hudson" to
"Jenkins".

What is Jenkins...
● On February 1, 2011, Oracle said that they intended to continue development of
Hudson, and considered Jenkins a fork rather than a rename. As of December
2016, the Jenkins organization on Git Hub had 638 project members and around
1,800 public repositories, compared with Hudson's 32 project members and 17
public repositories.
● Hudson is not maintained anymore, Jenkins is the replacement for it.
● Jenkins builds and tests our software continuously and monitors the execution
and status of remote jobs, making it easier for team members and users to
regularly obtain the latest stable code.

What is Continuous Integration
● Continuous Integration is a development practice in which
developers are required to commit changes to source code in a
shared repository several times a day. Every commit is then
build and this allows the teams to detect problems early.
● It then bring following benefits to software development:
1) Catch issues fast and nip them in the bud.
2) Everyone can see what’s happening.
3) Automate the build.
4) Continuous Integration leads to Continuous Deployment
allowing us to deliver software more rapidly.

What is Continuous Integration...

What is Continuous Integration...
● “Continuous Integration doesn’t get rid of
bugs, but it does make them dramatically
easier to find and remove.” - Martin Fowler,
chief scientist,ThoughtWorks.
● Jenkins is just a framework, it achieves
Continuous Integration by the help of Plugins.
It provides support for over 1000 Plugins .

Installing and Configuring Jenkins
JDK JDK 1.7 or above
Memory 2 GB RAM (recommended)
Disk Space No minimum requirement. However, all builds will be stored
on the Jenkins machines, it has to be ensured that sufficient
disk space is available for build storage.
Operating System Version Jenkins can be installed on Windows, Ubuntu/Debian, Red
Hat/Fedora/CentOS, Mac OS X, openSUSE, FReeBSD,
OpenBSD, Gentoo.
Java Container The WAR file can be run in any container that supports
Servlet 2.4/JSP 2.0 or later.(An example is Tomcat 5).

Installing and Configuring Jenkins...
● Download Jenkins: Open the official website of Jenkins :
https://jenkins.io/index.html
Click on Download Jenkins and download the LTS Release.
● From the command prompt, browse to the directory where the
jenkins.war file is present. Run the following command:
java -jar jenkins.war
● Extraction of the war file is done by an embedded webserver called
winstone.
● Jenkins by default runs on port 8080, but we can run it on different
port by issuing following command:
java -jar jenkins.war --httpPort=8181

Installing and Configuring Jenkins...
● Open http://localhost:8080/jenkins to check the Jenkins
Dashboard.
● We can now get the Jenkins-git setup enabled by
clicking the Manage Jenkins option and then click the
Available tab and enter the search keyword ie; git.
● Install the git plugin and restart Jenkins by issuing this
command in the browser:
http://localhost:8080/jenkins/restart

Managing Security
● There can be multiple users that can operate Jenkins for the
same set of project holding different responsibility.
● So it is very important to restrict access of users so they can
operate on their responsibility in a controlled manner.
● To manage access of users :
● Click on Manage Jenkins from the home page.
● Click on the link Configure global security.
● Under “Access Control” you will see an “Authorisation”
label.

Creating a job with Jenkins
●
To create a new build job in Jenkins: from the Jenkins Dashboard, Click on
“New Item”, Name your project and select project type.
● Next step : setup configurations
1) Configuring Global Tool Configuration
Here you can set JDK path, git configurations and Gradle/ Ant or Maven
installations as per your project requirement.
2) Creating or updating(if already created during project creation) project
configuration settings which may include General settings, Source code
management, build triggers, Pre-steps, Build, Post Steps, Emailing
notification regarding build and post build actions as per your project need.

References
● Here’s a list of references to get started with Jenkins:
1)https://blog.knoldus.com/2016/11/23/introduction-to-jenkins/
2)https://code.tutsplus.com/tutorials/introduction-to-jenkins-an-op
3)https://www.quora.com/What-is-Jenkins-When-and-why-is-it-us
4)https://www.blazemeter.com/blog/jenkins-vs-other-open-source

An Introduction To Jenkins

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