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
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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.
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. ??????
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