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3. Introduction to Jenkins
History
Architecture
Features
Plugins
Jenkins Pipelines and Jenkinsfile
Jenkins vs other CI/CD tools
Advantages
Installing and Configuring
Demo – CI/CD of React Application
,
CONTENTS
4. Jenkins is an open source continuous integration/continuous delivery and
deployment (CI/CD) automation software DevOps tools written in the Java
programming language.
It is used to implement CI/CD workflows, called pipelines.
Jenkins is a self-contained , open source automation that can be used to automate all
sorts of tasks related to building , testing and deploying software.
It uses the plugins for building and testing the project code continuously .
Jenkins can be installed through native system packages, Docker or even run
standalone by an machine with a Java Runtime Environment (JRE) installed.
,
INTRODUCTION TO JENKINS
5. Jenkins is a fork of a project called Hudson, which was trademarked by Oracle.
Kohsuke first developed Hudson 2004 while working at Sun Microsystems. When
Oracle acquired Sun Microsystems in 2010, there was a dispute between Oracle and
the Hudson community with the respect to infrastructure used.
Kohsuke wanted to create a method to perform continuous integration,the idea was
to test the code before committing to avoid the breaking builds.
On Jan 11, 2011, a call for votes made to change the project name from Hudson to
Jenkins.
On Jan 29, 2011 , creating the first Jenkins project.
,
HISTORY
7. Jenkins Master is the main Jenkins server. It is responsible for scheduling the build job and
dispatching builds to the slaves for actual execution. The Jenkins Master also monitors the slaves
by either taking them online or offline according to the requirement.
,
JENKINS MASTER AND JENKINS SLAVE
It can also help in recording and
presentation of build results.the master
instance can also help in the direct
execution of build jobs.
The most important element in Jenkins
architecture is the Jenkins slave. It is a
java executable running on a remote
machine that hear the requests from the
Jenkins master instance .
Users can run the slaves on a wide range
of other operating system and they
execute the build job sent by the Master.
9. A plugin is an enhancement to the Jenkins systems. They help extend Jenkins capabilities
and integrated Jenkins with other software.
Plugins can be downloaded from the online Jenkins plugin repository and loaded using the
Jenkins Web UI or CLI.
Currently, the Jenkins community claims over 1500+ plugins available for a wide range of
uses.
PLUGINS
Icons Description
Kubernetes plugin is great for automating build
agents on a Kubernetes cluster
Git plugin allows jobs to connect to remote
repositories
EC2 plugin is used for Jenkins to automatically
provision AWS
JUnit plugin provides graphical visualizations
11. The role of Jenkins in DevOps is primarily due to the pipeline-as-code concept followed by
Jenkins.
The continuous pipeline is an automated process for obtaining software from version
control to users and customers.
Jenkins Pipeline is defined using a text file called the Jenkinsfile.
The pipeline implements as code using Groovy Domain-specific language through an editor
or the configuration page on Jenkins instance.
Jenkinsfile give leverage to the developer to easily access or edit or check the code
anytime.
JENKINS PIPELINE AND JENKINSFILE
12. Two types os syntax using which we can define a Jenkinsfile:
-> Declarative Pipeline syntax
-> Scripted Pipeline syntax
Declarative Pipeline syntax ->
The declarative syntax is a new feature that used code for the pipeline . It provides a
limited pre-defined structure. Thereby, it offers an easy and simple continuous delivery
pipeline.
(We will create Jenkinsfile in SCM)
Scripted Pipeline syntax ->
The scripted pipeline syntax is the old traditional way to write the Jenkinsfile on Jenkins
web UI. Moreover it follows the groovy syntax and helps to develop a complex pipline
as code.
(It is written in Jenkins dashboard)
JENKINSFILE
13. Jenkins : the most-used CI/CD solutions.
No expenses required
Limitless integrations
Active community
,
JENKISN VS OTHER CI/CD TOOLS
14. It is open source and it is user-friendly, easy to install and does not required additional
installations or components. It is free of cost.
Easily Configurable: Jenkins can be easily modified and extended. It deploys code instantly,
generates test reports.
Platform independent: Jenkins is available for all the platform and different operating
system.
Rich Plugins ecosystem: The extensive pool of plugins makes Jenkins flexible and allow
building, deploying and automating across various platform.
Issuse are detected and resolve almost right way which keeps the software in a state where
it can be released at any time safely.
Most of the integration work in automated. Hence fewer integration issuses. This save both
time and money over the lifespan of a project.
ADVANTAGES
15. Prerequisites of Jenkins Installation
o Ubuntu server with 18.04, 20.04 or 22.04
o 256 MB of RAM
o 1 GB of drive space for solo use. However, no less than 10 GB is recommended if jenkins
run inside a Docker container
o 4GB+ of RAM
o 50GB+ of drive space
o Oracle JDK 8 or 11
o Jenkins by default runs on port 8080
INSTALLING AND CONFIGURING JENKINS
16. STEP -1 Installing Java Development kit
o Sudo apt-get install openjdk-11-jdk
Step -2 Installing Jenkins
o curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo tee
/usr/share/keyrings/jenkins-keyring.asc > /dev/null
o echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] https://pkg.jenkins.io/debian-stable
binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list > /dev/null
o sudo apt-get update
o sudo apt-get install jenkins
o sudo systemctl start jenkins.service
![ STEP -1 Installing Java Development kit
o Sudo apt-get install openjdk-11-jdk
Step -2 Installing Jenkins
o curl -fsSL https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo tee
/usr/share/keyrings/jenkins-keyring.asc > /dev/null
o echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] https://pkg.jenkins.io/debian-stable
binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list > /dev/null
o sudo apt-get update
o sudo apt-get install jenkins
o sudo systemctl start jenkins.service](https://image.slidesharecdn.com/devops-jenkins-250510050856-e73e4d10/85/DevOps-CI_CD_JAVA_JAVA______Jenkins-pptx-16-320.jpg)
