Day 26: Jenkins Declarative Pipeline ???

Jenkins is unfinished without pipelines; this is crucial.

A few terms to brush up on:

Pipeline: A pipeline is a group of tasks or activities connected in a sequential order.

Declarative: A more recent and sophisticated implementation of a pipeline as code is declarative.

Scripted: The pipeline was first and foremost implemented as a piece of code in Jenkins using the scripting language. It was developed using Groovy as a general-purpose DSL (domain-specific language).

Why?a?pipeline?is?important?

A text file (known as a "Jenkinsfile") containing the definition of a Jenkins pipeline can be committed to a project's source control repository.

This is the basis for treating the CD pipeline as a component of the program that needs to be versioned and evaluated just like any other code, or "pipeline-as-code."

Creating a Jenkins file and submitting it to source control offers the following advantages right away:

generates a pipeline build procedure for every branch and pull request automatically.

Review and revision of the Pipeline's code (along with the remaining source code).

Pipeline syntax

TASK 1

• Create a new job, but this time instead of choosing Freestyle Project, choose Pipeline. Go to the Jenkins UI and click on "New Item" to start a declarative pipeline.

• Type the name of the pipeline, choose Pipeline, and then click "OK."

• Now go to the pipeline session, In definition select Pipeline script.

• Write your pipeline script

Pipeline: The pipeline block, which is a required block, should come first in the declarative pipeline.

Where the Jenkins build task should execute is indicated by the agent. We choose agents as any in this instance.

Stages: Stage blocks are executable blocks that make up a Stages block.

Inside the stages block, at least one stage block must be present.

The stage name is "Hello" in this instance.

Steps:

The actual operation that needs to be carried out inside Jenkins is included in step blocks.

In the previous illustration, "Hello World" is being printed.

• Build the undertaking. By clicking the "Construct Now" link on the project's home page, you can manually build the project.
• By selecting "Full Stage view" from the project's home page, you may view each stage in detail.

• By?selecting?the?"Console?Output"?link?on?the?build?page?after?a?build?has?been?completed,?you?can?inspect?the?console?output.

The output from the pipeline above shows that it ran successfully and printed Hello World.

voila! Your upcoming project is prepared for use in the industry. ??????