💥💥 Today's Technotes 💥💥

What is Jenkinsfile?
Answer: The text file where all the definitions of pipelines are defined is called Jenkinsfile. It
is being checked in the source control repository.

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Mention some of the important plugins in Jenkins?
Answer: Plugins in Jenkins includes:
 Gits
 Maven 2 Project
 HTML Publisher
 Copy Artcraft
 Join
 Green Balls
 Amazon EC2

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What is Jenkins and why use it?
Ans: Jenkins is one of the leading open-source continuous integration tools. The main functionality of this tool is to keep track of the version control system and monitor the build system and provide notifications and reports to alert. It enables you to deliver software by integrating with a large number of testing and deployment technologies.

The following are the reasons to use Jenkins:

It possesses an installer package for major operating systems.

Integrates individual projects for a larger purpose

To keep your team in sync

Troubleshoot and audit past jobs effortlessly

Provides accurate data support for project management

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What is continuous integration?
Ans: Continuous integration is a process of continuously checking the developer’s code into a version control system several times a day and automating the build to check and detect bugs in the written code. Continuous Integration includes the following:

Development and Compilation

Database Integration

Unit Testing

Production Deployment

Code Labeling

Functional Testing

Generating and Analyzing Reports

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What are the features of Jenkins?
Ans: Jenkins comes with the following features:

Free open source.

Easy installation on various operating systems.

Build Pipeline Support.

Workflow Plugin.

Test harness built around JUnit.

Easy upgrades.

Rapid release cycle.

Easy configuration setup.

Excellent community and documentation

Extensible with the use of third-party plugins.

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What are the advantages of using Jenkins?
Ans: The advantages of using Jenkins are the following:

Open-source tool and user-friendly

Easy to install

Provides great collaboration between development and operations teams.

Code deployment is easy and happens in minutes, along with the generation of reports.

Free of cost

Platform independent

Rich plugin ecosystem

Code errors can be detected as early as possible.

Automation of integration work, thereby reducing the number of integration issues.

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What are the prerequisites to use Jenkins?
Ans: We require the following to use Jenkins:

A source code repository that is accessible, for instance, and a Git repository

A working build script. e.g., a Maven Script checked into the repository.

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Name some of the plugins in Jenkin?
Ans: Some of the important plugins in Jenkin includes:

Maven 2 project
Amazon EC2
HTML publisher
Copy Artifact
Join
Green Balls
Git plugin
Multi job plugin
Test Results Analyzer
Metrics

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Which command is used to start Jenkins?
Answer: You can follow the below-mentioned steps to start Jenkins:
1. Open Command Prompt
2. From the Command Prompt browse the directory where Jenkins. war resides
3. Run the command given below:
D:\>Java –jar Jenkins.war

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What is Jenkinsfile?
Answer: The text file where all the definitions of pipelines are defined is called Jenkinsfile. It
is being checked in the source control repository.

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What is the difference between Continuous Integration, Continuous Delivery,
and Continuous Deployment?
Answer: The diagrammatic representation given below can elaborate on the differences between Continuous Integration, Continuous Delivery, and Continuous Deployment more precisely.

💥💥 Today's Technotes 💥💥

What is Jenkins Pipeline? What is a CI CD pipeline?

Answer: The pipeline can be defined as the suite of plugins supporting the implementation and integration of continuous delivery pipelines in Jenkins.

Continuous integration or continuous delivery pipeline consists of build, deploy, test, release pipeline. The pipeline feature saves a lot of time and error in maintaining the builds.

Basically, a pipeline is a group of build jobs that are chained and integrated in sequence.

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What are Scripted Pipelines in Jenkins?
Answer: Scripted Pipeline follows Groovy Syntax as given below:
Node {
}
In the above syntax, the node is a part of the Jenkins distributed mode architecture, where
there are two types of node, Master which handle all the tasks in the development
environment and the Agent is being used to handle multiple tasks individually.

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💥💥 Today's Technotes 💥💥

What are Declarative Pipelines in Jenkins?
Answer: Declarative Pipelines are the newest additions to Jenkins that simplify the groovy syntax of Jenkins pipelines (top-level pipeline) with some exceptions, such as:
No semicolon to be used as a statement separator. The top-level pipeline should be
enclosed within block viz;
The common syntax is:
pipeline {
/* Declarative Pipeline */
}
Blocks must contain Sections, Directives, steps or assignments.
pipeline {
agent any
stages {
stage(‘Build’) {
steps {
// Statements…
}
}
stage (‘Test’) {
steps {
// Statements…
}
}
}
}
The above code has 3 major elements
 Pipeline: The block of script contents.
 Agent: Defines where the pipeline will start running from.
 Stage: The pipelines contain several steps enclosed in the block called
Stage.