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(Declarative) Jenkins Pipelines

Talk at the Mannheim Java User Group (MAJUG) Mannheim, 15.03.2017

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Declarative
Jenkins Pipelines
Steffen Gebert
Java User Group Mannheim, 15.03.2017
@StGebert on Twitter
@StephenKing elsewhere
2
Thanks
for sponsoring my travel costs
About Me
Researcher / PhD Student
(Software-based Networks)
2011 - 2016
Core Team Member
2010 - 2013
Server Admin Team Member
since 2011
3
Co-Organizer DevOps Meetup Würzburg
since 2016
Continuous Delivery
5
Agile Development
• Sprints of ~1-4 weeks duration
• Result: Product that can be
shown/given to customer
• Return: Feedback
Image	credits:	Marekventur,
Wikimedia, CC-BY-SA-3.0
6
Continuous Delivery
• Reduce cycle times (even more)
• “How long does it take to release a one-line change?”
• Potentially deliverable code with every commit
• Automated tests decide about acceptance
• You don’t have to release/deploy it, but you could
à Continuous Deployment: Deploy every successfully
tested commit automatically

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(Declarative) Jenkins Pipelines

  • 1. Declarative Jenkins Pipelines Steffen Gebert Java User Group Mannheim, 15.03.2017 @StGebert on Twitter @StephenKing elsewhere
  • 3. About Me Researcher / PhD Student (Software-based Networks) 2011 - 2016 Core Team Member 2010 - 2013 Server Admin Team Member since 2011 3 Co-Organizer DevOps Meetup Würzburg since 2016
  • 5. 5 Agile Development • Sprints of ~1-4 weeks duration • Result: Product that can be shown/given to customer • Return: Feedback Image credits: Marekventur, Wikimedia, CC-BY-SA-3.0
  • 6. 6 Continuous Delivery • Reduce cycle times (even more) • “How long does it take to release a one-line change?” • Potentially deliverable code with every commit • Automated tests decide about acceptance • You don’t have to release/deploy it, but you could à Continuous Deployment: Deploy every successfully tested commit automatically
  • 7. 7 Pipelines • Every check-in triggers pipeline execution • Feedback to the team in every stage • “Bring the pain forward” • “Fail fast, fail often” • Minimize execution time • Always aware of latest stable release
  • 8. CI & CD Tools
  • 9. 9 CI/CD Tools • On-premise • Jenkins • Thoughtworks Go • Gitlab CI • Pivotal Concourse • Jetbrains TeamCity • SaaS • TravisCI • CircleCI • AppVeyor • Codeship • Visual Studio Team Services
  • 10. 10 Why (I like) Jenkins • Established open source project • On premise installation • Thousands of plugins • Integrates with many tools/services • Tailored to CI/CD
  • 11. 11 History of CI/CD with Jenkins • Downstream Jobs • Job A triggers job B triggers job C triggers job D trig... • If one job fails, fail all • Build Pipeline View
  • 12. But that’s awkward … and what I want instead
  • 13. 13 Configuration as Code • Define jobs/pipelines as code • Avoid point & click • In version control • Can live with the application • Scales better • Example: .travis.yml (from TravisCI) • Similar to GitlabCI language: php services: - redis-server before_script: - composer install script: - ./bin/phpunit -c … notifications: slack: …
  • 14. 14 Code-driven Approaches in Jenkins • Jenkins Job Builder • Python / YAML based, from the OpenStack project • Job DSL plugin • Groovy DSL! (e.g. query Github API and create jobs for all branches) • Great thing! • But creates single jobs job('my-project-main') { scm { git('https://github.com/...') } triggers { scm('H/15 * * * *') } publishers { downstream('my-project-unit') } }
  • 16. 16 Jenkins Pipeline Plugins • Whole suite of plugins (20+), open-sourced a year ago • Shipped with Jenkins 2.0 • Formerly commercially available by CloudBees, called Workflow • Define pipeline as code (again Groovy DSL) stage("Hello") { ... } stage("World") { ... }
  • 17. 17 Pipeline Example pipeline { stages { stage("Build") { steps { echo "Starting engines" } } stage("Unit") { steps { sh "df -h" } } } agent any }
  • 18. 18 Pipeline DSL Steps • Shellout • *nix systems: sh • Windows systems: bat • SCM • File handling sh('make'), sh('rm -rf /') bat('C:Program Files..') git('https://github.com/..') readFile('my.config') writeFile(file: 'README.md', text: 'Hello World') fileExists('filename.txt')
  • 19. 19 Pipeline DSL Steps (2) • Copy workspace to next agent (aka executor/node) stage('build') { agent 'build-tool' steps { step { sh('make') stash('my-workspace') } } } // continue - - > stage('release') { agent 'release-machine' steps { step { unstash('my-workspace') sh('release') } } }
  • 20. 20 Pipeline DSL Steps (3) • Build another job: • Will not go further into detail J build("jobname") build("jobname", wait: false, propagate: false) build(job: 'jobname', parameters: [ [$class: 'StringParameterValue', name: 'target', value: target] [$class: 'ListSubversionTagsParameterValue', name: 'release', tag: release], [$class: 'BooleanParameterValue', name: 'update_composer', value: update_composer.to_boolean()])
  • 21. 21 Even More Pipeline Steps • Plugins contribute additional steps • Steps available in this Jenkins instance via • Online reference: https://jenkins.io/doc/pipeline/steps/
  • 23. 23 Parameters and Input • Parametrized build (before build starts) 1 • Input step (during pipeline execution) 2 bonus points for lock, milestone, timeout.. 1) see https://st-g.de/2016/12/parametrized-jenkins-pipelines 2) see http://stackoverflow.com/questions/42501553/jenkins-declarative-pipeline-how-to-read-choice-from-input-step pipeline { // agent, steps. etc. parameters { string(name: 'DEPLOY_ENV', defaultValue: 'TESTING', description: 'The target environment') input(message: 'Heyho', parameters: [string(..), ..])
  • 24. 24 Pipeline DSL • Specify custom environment variables (and access credentials) • Variables provided by Jenkins • Control flow (a tiny bit..) environment { AWS_ACCESS_KEY_ID = credentials('my-aws-key') } sh "echo $AWS_ACCESS_KEY_ID" sh 'echo $BUILD_NUMBER' echo env.BUILD_NUMBER when { branch 'production' { sh 'rm –rf /' } }
  • 25. 25 Full Example Parameterized Build pipeline { agent any parameters { string(name: 'DEPLOY_ENV', defaultValue: 'TESTING', description: 'Target environment') choice(name: 'FRUIT', choices: 'applenbanananpizza', description: 'Pick a fruit') } stages { stage('Something') { steps { echo "Will deploy to ${params.DEPLOY_ENV}" writeFile(file: 'fruit.txt', text: params.FRUIT) echo readFile('fruit.txt') } } } }
  • 26. 26 Docker • Run build jobs within Docker containers • No need to install software on Jenkins master/slave • Use multiple versions of the same tool • Containers can be existing ones or based on Dockerfile • .. and Kubernetes agent { docker { image 'maven:3-alpine' } stages { .. } }
  • 27. 27 Demo Time! Picture by annca/ pixabay: https://pixabay.com/en/popcorn-cinema-ticket-film-1433327/
  • 28. 28 pipeline { agent any tools { maven 'maven-3' } // or alternatively: // agent { docker 'maven:3-alpine' } stages { stage('Checkout') { steps { git "https://github.com/StephenKing/MAJUG17-jenkins-mvn" sh 'mvn clean' } } stage('Build') { steps { sh 'mvn package -DskipTests' } } stage('Tests') { steps { sh 'mvn test' } post { always { junit 'target/surefire-reports/**/*.xml' } } } } post { always { archiveArtifacts artifacts: '**/target/*.jar', fingerprint: true } success { emailext ( subject: "SUCCESSFUL: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]'", body: """SUCCESSFUL: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]': Check console output at ${env.BUILD_URL}""", to: 'mail@example.org' ) } failure { emailext ( subject: "FAILED: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]'", body: """FAILED: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]': Check console output at ${env.BUILD_URL}""", to: 'mail@example.org' ) } } }
  • 29. 29 Declarative What? • What you've seen now is the brand new stuff (pipeline-model-* v1.1) • Formerly, there were "scripted pipelines" • Groovy-based DSL • Real code à real power • Sometimes: real pain* • Both approaches officially supported * includes debugging, failure handling, script security / sandbox, CPS, …
  • 30. 30 Scripted Pipeline Example node { stage("Foo") { def data = new groovy.json.JsonSlurper().parseText(readFile('somefile.txt')) sh "make ${data.options}" } stage("Bar") { try { sh "make" } catch (err) { slackSend message: "Oh dude, didn't workout. ${err}" error "Things went wrong" } } if (env.BRANCH_NAME == 'master') { stage("Bar") { echo "Deploy!!" } } }
  • 31. 31 Scripted Pipeline Execution • node step allocates executor slot (“heavyweight executor”) • As other Jenkins jobs • Filter node by labels (i.e. node('php7'), node('master')) • Required for heavy lifting • Avoid many sequential allocations (slows down pipeline progress) • Code outside of node • Flyweight executor • Running on master, "for free” • Pipeline execution survives Jenkins restarts (CPS)
  • 32. 32 Pipeline Syntax: Declarative vs. Scripted • Beginning • Executor allocation • Post-build steps, failure handling • Flow control see https://jenkins.io/doc/book/pipeline/syntax/ pipeline { .. } // everything else agent(docker:'image') steps { .. } node('label') { sh .. } // or docker.image('..').inside{ .. } post { failure {} always {} } try { sh .. } catch { cry } when { .. } script { // groovy script } // any groovy statement (node can be used for declarative as well)
  • 33. 33 More on Scripted Pipelines ..in older versions of this talk https://st-g.de/speaking
  • 34. Where to put that config?
  • 35. 35 Pipeline Configuration • Paste code into job config (fine for testing) (job type: Pipeline) • Create pipelines via JobDSL • Commit it to your repo (job type: Multibranch) • File called Jenkinsfile • It evolves with the application • It is versioned • Everybody can read (and modify) it • You can throw away your Jenkins master at any time
  • 36. 36 Multibranch & Organization Folder Plugins • Scans a complete GitHub/Bitbucket organization for Jenkinsfile • Triggered by Webhook and/or runs periodically • Automatically adds pipeline jobs per repo/branch/PR
  • 37. 37 DRY: Jenkins Global Library • Provides shared functionality available for all jobs • Loaded from remote Git repos • Specified in global configuration or on folder-level • Specified in Jenkinsfile @Library("https://github.com/..") node { deployToProd() } @Library("mylib@v1.2") node { deployToProd() } node { deployToProd() }
  • 38. 38 Snipped Editor & Docs • Because first steps are hard.. • For scripted and declarative pipelines • Auto-generated DSL documentation (Pipeline Syntax → Step Reference)
  • 40. Jenkins Pipelines for Chef Cookbooks Real-World Example
  • 41. 41 Chef CI/CD at TYPO3.org • Code that runs the *.typo3.org infrastructure, chef-ci.typo3.org • Objective: Chef cookbooks • Server provisioning (installs packages, configures services) • Code: github.com/TYPO3-cookbooks
  • 42. 42 Many Cookbooks, Many Pipelines • Scans our GitHub organization TYPO3-cookbooks • Automatically adds/removes pipelines for branches and pull requests* • Triggered via Webhooks • Contents of Jenkinsfile: def pipe = new org.typo3.chefci.v1.Pipeline() pipe.execute() * Currently suspicious to arbitrary code execution
  • 43. 43 Jenkins Global Library • Pipelines implemented in Global Library TYPO3-infrastructure/jenkins-pipeline-global-library-chefci
  • 44. 44 Parallelize Integration Tests • Run Test-Kitchen (integration test for Chef cookbooks) • Run all instances in parallel (by Jenkins) $ kitchen list Instance Driver Provisioner [..] Last Action default-debian-78 Docker ChefZero <Not Created> default-debian-82 Docker ChefZero <Not Created> physical-debian-78 Docker ChefZero <Not Created> physical-debian-82 Docker ChefZero <Not Created> production-debian-78 Docker ChefZero <Not Created> production-debian-82 Docker ChefZero <Not Created>
  • 45. 45 Parallelize Integration Tests (2) • Goal: Extract instance list, run kitchen commands in parallel • Expected result: parallel( 'default-debian-82': { node { unstash('cookbook-tk') sh('kitchen test --destroy always default-debian-82') } }, 'physical-debian-82': { node { unstash('cookbook-tk') sh('kitchen test --destroy always physical-debian-82') }...
  • 46. 46 Parallelize Integration Tests (3) • Grab list of instance names def ArrayList<String> getInstanceNames(){ def instanceNames = [] node { def lines = sh(script: 'kitchen list', returnStdout: true).split('n') for (int i = 1; i < lines.size(); i++) { instanceNames << lines[i].tokenize(' ')[0] } } return instanceNames } * Closures don’t always work well within pipeline code (cf. @NonCPS)
  • 47. 47 Parallelize Integration Tests (4) def Closure getNodeForInstance(String instanceName) { return { // this node (one per instance) is later executed in parallel node { // restore workspace unstash('cookbook-tk') sh('kitchen test --destroy always ' + instanceName) }}} for (int i = 0; i < instanceNames.size(); i++) { def instanceName = instanceNames.get(i) plNodes[instanceName] = this.getNodeForInstance(instanceName) } parallel plNodes
  • 48. 48 Failure Notification • Pipeline stops, when any step fails • But.. I want that info in Slack! def run(Object step){ try { step.execute() } catch (err) { this.postBuildNotify failTheBuild("Build failed") } } def execute() { this.prepare() this.run(new Lint()) this.run(new BerkshelfInstall()) this.run(new TestKitchen()) this.run(new ArchiveArtifacts()) if (env.BRANCH_NAME == "master") { this.run(new BerkshelfUpload()) } }
  • 49. 49
  • 51. 51 Summary • Finally nice pipelines! • The way to go with Jenkins • Many Jenkins plugins already compatible • Pipeline as code! • Versioned • Doesn't mess up Jenkins jobs • Code sharing • New UI stuff still freaking broken • Endless possibilities - can be complex and painful* • Chained pipelines? Yes, but.. *IMHO still better than YAML
  • 52. 52 Further Reading • Pipeline Documentation: https://jenkins.io/doc/book/pipeline/ • Step documentation: https://jenkins.io/doc/pipeline/steps/ • Pipeline shared libraries: https://jenkins.io/doc/book/pipeline/shared-libraries/ • Parallel execution: https://jenkins.io/blog/2016/06/16/parallel-test-executor-plugin/ • Extending pipeline DSL: https://jenkins.io/blog/2016/04/21/dsl-plugins/ • Controlling the Flow with Stage, Lock, and Milestone: https://jenkins.io/blog/2016/10/16/stage-lock-milestone/ • TYPO3's Chef CI: https://chef-ci.typo3.org