What is Pipeline as code concept in jenkins

Question

I am a beginner in Jenkins and recently came across this term "Pipeline as Code". What does this mean?

Answer 1

Jenkins "Pipeline as code"  allows you to define and automate pipelined job processes with code. Code that can be stored and versioned in a repository which allows you to track changes over time and used by jenkins to run build jobs.

To use Pipeline as code, projects must contain a file named Jenkinsfile in the repository root, which contains a "Pipeline script" that specifies the steps to execute the job.

A Jenkinsfile can be written using two types of syntax - Declarative and Scripted.

Scripted pipeline is built upon groovy and is more suitable for jobs that have a considerable amount of complexity whereas Declarative Pipeline was created to offer a simpler and more opinionated syntax for authoring Jenkins Pipeline.

You could have a look at these references for more info on the concepts of pipeline as code and also syntaxes of writing a scripted or declarative pipeline:

https://jenkins.io/doc/book/pipeline-as-code/

https://jenkins.io/doc/book/pipeline/getting-started/

https://jenkins.io/doc/book/pipeline/syntax/

For a beginner's guide on creation of pipeline tutorial you could refer to this blog:

https://www.edureka.co/blog/jenkins-pipeline-tutorial-continuous-delivery