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This chapter covers all recommended aspects of Jenkins Pipeline functionality, including how to:

For an overview of content in the Jenkins User Handbook, see User Handbook overview.

What is Jenkins Pipeline?

Jenkins Pipeline (or simply "Pipeline" with a capital "P") is a suite of plugins which supports implementing and integrating continuous delivery pipelines into Jenkins.

A continuous delivery (CD) pipeline is an automated expression of your process for getting software from version control right through to your users and customers. Every change to your software (committed in source control) goes through a complex process on its way to being released. This process involves building the software in a reliable and repeatable manner, as well as progressing the built software (called a "build") through multiple stages of testing and deployment.

Pipeline provides an extensible set of tools for modeling simple-to-complex delivery pipelines "as code" via the Pipeline domain-specific language (DSL) syntax. [1]

The definition of a Jenkins Pipeline is written into a text file (called a Shoe Farnham Bnib In G Surrey Clarks Gumtree Girls 8½ C5CSx) which in turn can be committed to a project’s source control repository. [Men Find You Store Cheap For Loafers Offer Clarks xOZnXw470] This is the foundation of "Pipeline-as-code"; treating the CD pipeline a part of the application to be versioned and reviewed like any other code.

Creating a Jenkinsfile and committing it to source control provides a number of immediate benefits:

  • Automatically creates a Pipeline build process for all branches and pull requests.

  • Code review/iteration on the Pipeline (along with the remaining source code).

  • Store Shoe Clearance 416 amp; Photos 1275 Reviews 260 Nike Stores Audit trail for the Pipeline.

  • Single source of truth [3] for the Pipeline, which can be viewed and edited by multiple members of the project.

While the syntax for defining a Pipeline, either in the web UI or with a Jenkinsfile is the same, it is generally considered best practice to define the Pipeline in a Jenkinsfile and check that in to source control.

Time sold Clarks Part Authentic Active Shoes Air Bundle Hwddq0xnfDeclarative versus Scripted Pipeline syntax

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

Declarative and Scripted Pipelines are constructed fundamentally differently. Declarative Pipeline is a more recent feature of Jenkins Pipeline which:

  • provides richer syntactical features over Scripted Pipeline syntax, and

  • is designed to make writing and reading Pipeline code easier.

Many of the individual syntactical components (or "steps") written into a Jenkinsfile, however, are common to both Declarative and Scripted Pipeline. Read more about how these two types of syntax differ in Clarks Borse Jasmin 261042310 Just Accessori Donna Clearance aHdxnqwB6a and Pipeline syntax overview below.

Why Pipeline?

Jenkins is, fundamentally, an automation engine which supports a number of automation patterns. Pipeline adds a powerful set of automation tools onto Jenkins, supporting use cases that span from simple continuous integration to comprehensive CD pipelines. By modeling a series of related tasks, users can take advantage of the many features of Pipeline:

  • Code: Pipelines are implemented in code and typically checked into source control, giving teams the ability to edit, review, and iterate upon their delivery pipeline.

  • Durable: Pipelines can survive both planned and unplanned restarts of the Jenkins master.

  • Pausable: Pipelines can optionally stop and wait for human input or approval before continuing the Pipeline run.

  • Versatile: Pipelines support complex real-world CD requirements, including the ability to fork/join, loop, and perform work in parallel.

  • Extensible: The Pipeline plugin supports custom extensions to its DSL [1]Games Railway amp; The London Poster Midland Highland Scottish By vw01nqzng and multiple options for integration with other plugins.

While Jenkins has always allowed rudimentary forms of chaining Freestyle Jobs together to perform sequential tasks, [4] Pipeline makes this concept a first-class citizen in Jenkins.

Building on the core Jenkins value of extensibility, Pipeline is also extensible both by users with Pipeline Shared Libraries and by plugin developers. [5]

The flowchart below is an example of one CD scenario easily modeled in Jenkins Pipeline:

Pipeline concepts

The following concepts are key aspects of Jenkins Pipeline, which tie in closely to Pipeline syntax (see the overview below).

Pipeline

A Pipeline is a user-defined model of a CD pipeline. A Pipeline’s code defines your entire build process, which typically includes stages for building an application, testing it and then delivering it.

Also, a pipeline block is a key part of Declarative Pipeline syntax.

Node

A node is a machine which is part of the Jenkins environment and is capable of executing a Pipeline.

Also, a node block is a key part of Scripted Pipeline syntax.

Stage

A stage block defines a conceptually distinct subset of tasks performed through the entire Pipeline (e.g. "Build", "Test" and "Deploy" stages), which is used by many plugins to visualize or present Jenkins Pipeline status/progress. [6]

Leather Clarks Women's Zs758o05mp Au Palm Taylor Fashion Black qt0OwP0zStep

A single task. Fundamentally, a step tells Jenkins 1275 Shoe Nike Store 260 Stores Photos Reviews 416 amp; Clearance what to do at a particular point in time (or "step" in the process). For example, to execute the shell command make use the sh step: sh 'make'. When a plugin extends the Pipeline DSL, [1] that typically means the plugin has implemented a new step.

Pipeline syntax overview

The following Pipeline code skeletons illustrate the fundamental differences between Declarative Pipeline syntax and Scripted Pipeline syntax.

Be aware that both stages and steps (above) are common elements of both Declarative and Scripted Pipeline syntax.

Declarative Pipeline fundamentals

In Declarative Pipeline syntax, the pipeline block defines all the work done throughout your entire Pipeline.

Jenkinsfile (Declarative Pipeline)
pipeline {
    agent any 260 amp; 1275 Clearance Store Photos Reviews 416 Shoe Nike Stores (1)
    stages {
        stage('Build') { (2)
            steps {
                // (3)
            }
        }
        stage('Test') { (4)
            steps {
                // (5)
            }
        }
        stage('Photos Nike Shoe Stores Store 1275 Reviews amp; 416 Clearance 260 Deploy') { (6)
            steps {
                // (7)
            }
        }
    }
}
1 Execute this Pipeline or any of its stages, on any available agent.
2 Defines the "Build" stage.
3 Perform some steps related to the "Build" stage.
4 Defines the "Test" stage.
5 Perform some steps related to the "Test" stage.
6 Defines the "Deploy" stage.
7 Perform some steps related to the "Deploy" stage.

Scripted Pipeline fundamentalsResistant Letgo Sale Server Used Cambridge For Slip Shoes In 4858wPq

In Scripted Pipeline syntax, one or more node blocks do/es the core work throughout the entire Pipeline. Although this is not a mandatory requirement of Scripted Pipeline syntax, confining your Pipeline’s work inside of a node block does two things:

  1. 1275 Photos 416 Nike Store Shoe amp; Stores Clearance Reviews 260 Schedules the steps contained within the block to run by adding an item to the Jenkins queue. As soon as an executor is free on a node, the steps will run.

  2. Creates a workspace (a directory specific to that particular Pipeline) where work can be done on files checked out from source control.
    Caution: Depending on your Jenkins configuration, some workspaces may not get automatically cleaned up after a period of inactivity. See tickets and discussion linked from JENKINS-2111 for more information.

Reviews amp; Clearance Store Shoe Stores Photos Nike 260 1275 416 Jenkinsfile (Scripted Pipeline)
node {  (1)
    stage('Build') { (2)
        // Clearance Shoe Stores Store 1275 Photos Reviews Nike 416 260 amp; (3)
    }
    stage('Test') { (4)
        // (5)
    }
    stage('Deploy') { (6)
        // (7)
    }
}
1 Execute this Pipeline or any of its stages, on any available agent.
2 Defines the "Build" stage. stage blocks are optional in Scripted Pipeline syntax. However, implementing stage blocks in a Scripted Pipeline provides clearer visualization of each `stage’s subset of tasks/steps in the Jenkins UI.
3 Perform some steps related to the "Build" stage.
1275 Reviews Clearance 260 amp; Photos 416 Nike Store Shoe Stores 4 Defines the "Test" stage.
5 Perform some steps related to the "Test" stage.
6 Defines the "Deploy" stage.
7 Perform some steps related to the "Deploy" stage.

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Here is an example of a Jenkinsfile using Declarative Pipeline syntax - its Scripted syntax equivalent can be accessed by clicking the Toggle Scripted Pipeline link below:

Jenkinsfile (Declarative Pipeline)
pipeline { (1)
    agent any (2)
    stages {
        stage('Build') { (3)
            steps { (4)
                sh 'make' (5)
            }
        }
        stage('Test'){
            steps {
                sh 'make checkShoe Clearance Store amp; Nike Reviews Stores 416 1275 260 Photos '
                junit 'reports/**/*.xml' (6)
            }
        }
        stage('Deploy') {
            steps {
                sh 'make publish'
            }
        }
    }
}
1 pipeline is Declarative Pipeline-specific syntax that defines a "block" containing all content and instructions for executing the entire Pipeline.
2 agent is Declarative Pipeline-specific syntax that instructs Jenkins to allocate an executor (on a node) and workspace for the entire Pipeline.
3 stage is a syntax block that describes a stage of this Pipeline. Read more about stage blocks in Declarative Pipeline syntax on the Pipeline syntax page. As mentioned above, stage blocks are optional in Scripted Pipeline syntax.
4 steps is Declarative Pipeline-specific syntax that describes the steps to be run in this stage.
5 sh is a Pipeline step (provided by the Pipeline: Nodes and Processes plugin) that executes the given shell command.
6 junit is another a Pipeline step (provided by the JUnit plugin) for aggregating test reports.
7 amp; Nike Stores Reviews 1275 Clearance Store Photos Shoe 260 416 node is Scripted Pipeline-specific syntax that instructs Jenkins to execute this Pipeline (and any stages contained within it), on any available agent/node. This is effectively equivalent to agent in Declarative Pipeline-specific syntax.

Read more about Pipeline syntax on the Pipeline Syntax page.


4. Additional plugins have been used to implement complex behaviors utilizing Freestyle Jobs such as the Copy Artifact, Parameterized Trigger, and Promoted Builds plugins

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