7 Habits of Highly Effective Jenkins Users

Continuous Delivery as Code
Pipeline and Jenkins 2

Continuous Delivery
Continuous delivery (CD) is a software engineering approach in
which teams produce software in short cycles, ensuring that
the software can be reliably released at any time. It aims at
building, testing, and releasing software faster and more
frequently. The approach helps reduce the cost, time, and risk
of delivering changes by allowing for more incremental
updates to applications in production. A straightforward and
repeatable deployment process is important for continuous
delivery.
https://en.wikipedia.org/wiki/Continuous_delivery

Meet Jenkins 2
jenkins.io/2.0

Jenkins 2 Themes
Pipeline as code: front and center
Improved “out of the box” user
experience
User interface improvements

Pipeline as code
• Introduce “Pipeline” as a new type in Jenkins
• Codify an implicit series of stages into an explicit
pipeline definition (Jenkinsfile) in source control
• Resumability/durability of pipeline state
• Extend the DSL to meet organizational needs

Creating a Pipeline

Jenkinsfile
node('java8') {
stage('Checkout') {
checkout scm
}
stage('Build') {
sh 'mvn clean install'
}
stage('Test') {
sh 'mvn test'
}
archiveArtifacts artifacts: 'target/**/*.jar', fingerprint: true
}

Pipeline Documentation
jenkins.io/doc

Pipeline Documentation

Snippet Generator localhost:8080/job/niagara/pipeline-syntax

DSL Reference localhost:8080/job/niagara/pipeline-syntax/html

Pipeline Plugins
Extending Pipeline

Pipeline Stage View plugin

Pipeline Multibranch plugin
• Represent pipelines for multiple branches in one "Folder"
• Automatically scan a repository for each branch which contains a
Jenkinsfile

GitHub Organization Folder plugin

Blue Ocean jenkins.io/projects/blueocean

Docker Pipeline plugin
def imageName = 'jenkinsciinfra/bind' 
 
node('docker') { 
checkout scm 
// Compute a unique image tag 
def imageTag = "build-${env.BUILD_NUMBER}" 
// The `docker` variable introduced by the plugin 
stage('Build') { 
def whale = docker.build("${imageName}:${imageTag}")
} 
// Publish this image to Docker Hub 
stage('Deploy') { 
whale.push()
}
}

Docker Pipeline plugin
node('docker') {
// The `docker` variable introduced by the plugin.
//
// Invoking our Gradle build inside a freshly spun up
// Docker container with JDK8
docker.image('openjdk:8-jdk').inside {
checkout scm
sh './gradlew --info'
archiveArtifacts artifacts: 'build/libs/**/*.jar', fingerprint: true
}
}

Integration with existing plugins
Pipeline + ??? = Profit.

Plugins that support Pipeline
• A few plugins which provide custom steps for Pipeline scripts:
– Tooling: Credentials binding, SSH Agent, Parallel Test
– Reporters: JUnit, Brakeman, HTML Publisher, Cucumber Test Result
– Notifiers: Slack, HipChat, email-ext
– Wrappers: Timestamper
• Plugins work within Pipelines
– SCM: Git, SVN, Mercurial, P4, CVS
– Wrappers: Ansi Color, NodeJS
– Build steps: Ant, etc
• More defined in COMPATIBILITY.md

Steps added by plugins
node {
/* other work happened up here */
timestamps {
sh 'mvn clean package'
junit '**/target/surefire-reports/*.xml'
}
if (env.BRANCH_NAME == 'master') {
sshagent(credentials: ['my-credential-id']) {
sh './run-ssh-deploy-script'
}
}
}

Build Steps

Build Wrappers
github.com/jenkinsci/pipeline-examples

Abstracting Pipeline
Sharing code, best practices and templates for success

Pipeline Shared Libraries
// The call() method in any file in pipeline-library.git/vars is exposed as a 
// method with the same name as the file. 
def call(def mavenOptions) {
docker.image('maven').inside {
timestamps {
sh "mvn clean install -Dmaven.test.failure.ignore=true $
{mavenOptions}"
}
junit '**/target/surefire-reports/**/*.xml'
} 
}
runMaven.groovy

node {
checkout scm
stage('Build') {
// Loads runMaven step from the Shared Library and invokes it.
runMaven
}
stage('Acceptance Tests') {
git 'git://git.example.com/selenium-tests.git'
sh './run-selenium.sh'
}
stage('Deploy') {
sh './deploy.sh'
}
}
Pipeline Shared Libraries
Jenkinsfile

load step
// Methods in this file will end up as
object methods on the object that load
returns. 
def lookAtThis(String whoAreYou) { 
echo "Look at this, ${whoAreYou}! You
loaded something from another file!" 
}
externalMethod.groovy
// If there's a call method, you can just
load the file, say, as "foo", and then
invoke that call method with foo(...)  
def call(String whoAreYou) { 
echo "${whoAreYou}, say thanks to the
call(...) method." 
}
externalCall.groovy
node {
// Load the file from the current
directory,
// into a variable called "externalMethod"
def externalMethod =
load("externalMethod.groovy") 
 
// Call the method we defined 
externalMethod.lookAtThis("Steve") 
 
// Now load 'externalCall.groovy'. 
def externalCall =
load("externalCall.groovy") 
 
// We can just run it with
`externalCall()` 
externalCall("Steve") 
}
Jenkinsfile

Continuous Delivery as Code
Final Thoughts

• A new pipeline “type” has been introduced
• Previously implicit pipelines, chained jobs, can now be
made explicit and committed to SCM
• Pipelines have state associated with them and can be
resumed
• It’s code. It can be modified and extended
Final Thoughts

Questions/Answers
jenkins.io/2.0
jenkins.io/doc
@jenkinsci

7 Habits of Highly Effective Jenkins Users

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