DevOops 2019 - Under the hood of serverless Jenkins. Jenkinsfile Runner

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© 2019 CloudBees, Inc. All Rights Reserved. ● CloudBees Jenkins Distribution ● CloudBees Jenkins Support ● Community, e.g. Java 11 support, Jenkinsfile Runner, JCasC > whoami -cloudbees 5 https://www.cloudbees.com

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© 2019 CloudBees, Inc. All Rights Reserved. Hudson/Jenkins as you knew it… in 2011 Batteries are not included Complex configuration Mega-masters, limited scalability Painful upgrades Maintenance is required 8

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© 2019 CloudBees, Inc. All Rights Reserved. “General purpose CI/CD engine that runs on Kubernetes and embraces fundamentally different architecture & extensibility mechanisms” Cloud Native Jenkins 14 https://flic.kr/p/75ncBF Kohsuke Kawaguchi, 2018

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© 2019 CloudBees, Inc. All Rights Reserved. ● Best service for each need ● Pay per use ● “Infinite” scaling ● Easy to use ● Easy to maintain ● Fast to develop Cloud Native Jenkins 15 https://flic.kr/p/75ncBF

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© 2019 CloudBees, Inc. All Rights Reserved. Founded in July 2018 https://jenkins.io/sigs/cloud-native Goal: Improve Jenkins to run on cloud environments as a "Cloud Native" application Cloud Native Special Interest Group 16 ?

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© 2019 CloudBees, Inc. All Rights Reserved. 22 ● AWESOME (c) ● Cloud native ● K8s native ● Scalable ● Designed for CD ● Moving fast ● Kubernetes-only ● GitOps-only ● Limited SCMs support ● Limited CI capabilities ● No auto-migration from Jenkins Jenkins X 2.x is… Limitations

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© 2019 CloudBees, Inc. All Rights Reserved. 23 ● AWESOME (c) ● Cloud native ● K8s native ● Scalable ● Designed for CD ● Moving fast ● Kubernetes-only ● GitOps-only ● Limited SCMs support ● Limited CI capabilities Jenkins X 2.x is… Limitations Try out Jenkins X if it fits your environment OR if you plan to go all-in Kubernetes. Jenkins is still around for other cases

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© 2019 CloudBees, Inc. All Rights Reserved. JFR TL;DR ● Runs Pipeline and shuts down ● Fat JAR or a thin JAR pack ● Docker image ● Runs everywhere ● Startup in milliseconds/seconds 29 https://github.com/jenkinsci/jenkinsfile-runner

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© 2019 CloudBees, Inc. All Rights Reserved. Usage: jenkinsfile-runner [options] [params] Options: -f (--file) FILE : Path to Jenkinsfile (or directory containing a Jenkinsfile) to run -w (--jenkins-war) FILE : Path to the exploded jenkins.war directory -p (--plugins) FILE : plugins.txt file or a /plugins installation directory Advanced: --runHome FILE : Path to the empty Jenkins Home directory to use for this run --runWorkspace FILE : Path to the workspace to be used within node{} context. -a (--arg) : Parameters to be passed to workflow job -b (--build-number) N : Build number of the run -c (--cause) VAL : Cause of the run -n (--job-name) VAL : Name of the job the run belongs to -ns (--no-sandbox) : Disable the sandbox environment 31

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© 2019 CloudBees, Inc. All Rights Reserved. ● Not a CI/CD solution on its own ● Jenkinsfile Runner is not 100% Jenkins ● No Web UI ● No build throttling, cross-master communication, etc. ● Designed for a single-container ● Slow agent connection ● No out-of-the-box sidecar containers support Limitations 37

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© 2019 CloudBees, Inc. All Rights Reserved. Jenkinsfile Runner flavors 41 Vanilla: Docker/Binary in the official repo ● Basic plugins: Pipeline, JCasC, etc. ● GitHub: jenkinsci/jenkinsfile-runner ● DockerHub: jenkins4eval/jenkinsfile-runner

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© 2019 CloudBees, Inc. All Rights Reserved. Jenkinsfile Runner flavors 42 Custom JFR packages ● Way to go in 95% of cases ● Ready-to-fly Docker images with plugins and configs ● Extending the Vanilla Docker image ● https://jenkins.io/blog/2018/10/16/custom-war-packager/ Vanilla: Docker/Binary in the official repo ● Basic plugins: Pipeline, JCasC, etc. ● GitHub: jenkinsci/jenkinsfile-runner ● DockerHub: jenkins4eval/jenkinsfile-runner

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© 2019 CloudBees, Inc. All Rights Reserved. Building custom Jenkinsfile Runner images 43 https://jenkins.io/blog/2018/10/16/custom-war-packager/ Custom WAR Packager Jenkinsfile Runner Core and Plugins Configuration-as-code Packaging Ready-to-fly Docker image Base image Y A M L

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© 2019 CloudBees, Inc. All Rights Reserved. Jenkinsfile Runner. Usage examples Jenkins X 1.x, serverless mode ● jenkins-x/jenkins-x-serverless ci.jenkins.io-runner ● jenkinsci/ci.jenkins.io-runner “FaaS” packaging ● GitHub Actions: jonico/jenkinsfile-runner-github-actions ● Codeship: oleg-nenashev/codeship-jenkinsfile ● AWS Lambda: carlossg/jenkinsfile-runner-lambda ● Project Fn: carlossg/jenkinsfile-runner-fn 44

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© 2019 CloudBees, Inc. All Rights Reserved. Jenkins X. Serverless Mode (before April 2019) 46 https://medium.com/@jdrawlings/ser verless-jenkins-with-jenkins-x- 9134cbfe6870 Serverless Jenkins with Jenkins X

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50 Jenkinsfile Runner Jenkinsfile Runner is Here

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© 2019 CloudBees, Inc. All Rights Reserved. Jenkinsfile Runner on CloudBees CodeShip ● Jenkins has no good SaaS (now) ● CodeShip Pro - CI SaaS with native Docker support ● Free tiers for open-source projects ● What if we run Jenkins there? 60 https://codeship.com/features/pro

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© 2019 CloudBees, Inc. All Rights Reserved. Example 2. Building a Jenkins plugin in CodeShip https://github.com/oleg-nenashev/mailer-plugin/tree/codeship-demo ● Using ci.jenkins.io-runner ○ https://github.com/jenkinsci/ci.jenkins.io-runner ● Using the standard Jenkins Pipeline library ○ https://github.com/jenkins-infra/pipeline-library ● Using standard Jenkinsfile ○ buildPlugin() 63

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© 2019 CloudBees, Inc. All Rights Reserved. ● Waiting for user feedback/patches ● TBD - Jenkinsfile Runner 1.0 ● Packaging for common cases ● Lightweight sidecar containers ● Jenkinsfile Runner Jenkins Plugin? ● Experiments with GraalVM and Quarkus Future work 75

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© 2019 CloudBees, Inc. All Rights Reserved. ● Jenkins-as-a-function is real ● You can run your Pipelines everywhere ● There are tools for that ● Use Jenkins X if applicable (K8s/GitOps) ● Consider Jenkinsfile Runner if not Takeaways 77

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© 2019 CloudBees, Inc. All Rights Reserved. ● jenkinsci/jenkinsfile-runner ● CONTRIBUTING.md in the repository ● 1 day of Hacktoberfest left ;) ○ https://jenkins.io/events/hacktoberfest/ It is a great time to contribute! 78

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