# Create Declarative Pipeline

By

Paul Tomoiu

●

In 

Jenkins, 

pipeline

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Published 2022-12-03

This tutorial explains to you how we can create a declarative pipeline in Jenkins.

In Jenkins, a pipeline is a collection of events or jobs which are interlinked with one another in a sequence.

Jenkins pipelines can be written using two types of syntax:

• Declarative: more recent, designed to make writing and reading Pipeline code easier

• Scripted: written in Groovy, no limits as to what a scripted pipeline can do programmatically, but very hard to maintain

The code of the pipeline could be written directly in Jenkins UI or could be written in Jenkinsfile, and is kept into the project’s source code in a Git repository. Jenkinsfile could be written in declarative or scripted manner.

In order to create and test the Declarative Pipelines, first, we need to create a new declarative pipeline:

Once created, we need to create (if we don't have already) a GitHub repository and a file named Jenkinsfile in it. In my case I use a classical example of Jenkinsfile :

pipeline {
    agent any

    stages {
        stage('Build') {
            steps {
                echo 'Building..'
                bat "dir"
            }
        }
        stage('Test') {
            steps {
                echo 'Testing..'
            }
        }
        stage('Deploy') {
            steps {
                echo 'Deploying....'
            }
        }
    }
}

Now we need to configure the Jenkins pipeline. We go to the Job configuration page in the Jenkins administration console.

From the "General" tab, we need to set the Project url.

From the "Pipeline" tab, we need to set the SCM system and the repository URL.

Choose the branch from the GitHub you want to use.

Choose the file which will be used for creating the Declarative Pipeline and click on "OK" button.

Now all is configured and set up.

Let's test it.

From the Dashboard we can run the pipeline:

And here we have the execution of the job: