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Continuous Integration in the Cloud with Hudson. Kohsuke Kawaguchi Jesse Glick Sun Microsystems, Inc. Hudson committers. Rise of Continuous Integration. Offload from people, push to computers. $. computers. us. time. Spend more CPU power to help you. … even if it only helps a little - PowerPoint PPT Presentation
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Continuous Integrationin the Cloudwith HudsonKohsuke KawaguchiJesse GlickSun Microsystems, Inc.Hudson committers
Rise of Continuous Integration
> Offload from people, push to computers
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$
time
computers
us
Spend more CPU power to help you
> … even if it only helps a little
> First on your laptops and workstations IDEs are at the forefront
> And then to the servers a.k.a. “Continuous Integration” More frequent build/test executions Static code analysis tools And more to come
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Hudson
> Open-source CI server at java.net
> Emphasis on ease of installation and use “java -jar hudson.war” execution Configure everything from browsers
> Extensibility 140+ community-developed public plugins By 150+ contributors
> Estimated 13,000 installations4
https://hudson.dev.java.net/
It basically does builds and tests
> Check out the source code Subversion, Perforce, Git, Mercurial, CVS, …
> Do builds and/or tests Ant, Maven, MSBuild, shell script, …
> Record results Binary, test results, code coverage, static analysis
> Notify people E-mail, IM, RSS, tray apps, IDEs
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Localized to 8 languages
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And hopefully more to come…
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Adoption in all kinds of businesses
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Why Distributed Builds?
> You need to use multiple computers because… You need different environments You need isolation
> There’s only so much you can do with 1 computer
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Before we talk about clouds…
> Going virtual doesn’t solve… Software installation problem Node failure problem Remote maintenance problem …
> What does Hudson do to help you with these?
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Installing new slaves
> For first 20 or so slaves, we did it manually Insert CD, click, type, click, type, click, … But that doesn’t scale
> Then we automated Available as “Hudson PXE Plugin”
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Automated System Installations
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> Slaves Power on, hit F12 PC boots from network (PXE)
> Hudson + PXE plugin ISO images of OS
Automated System Installations
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> Slaves Power on, hit F12 PC boots from network (PXE) Choose OS from menu Installs non-interactively
> Hudson + PXE plugin ISO images of OS
Your corporate IT guy & his DHCP server
Automated System Installations
> Supports OpenSolaris, Ubuntu, CentOS, Fedora Trivial with most Linux
> Cooperate with Windows, too
> Quite useful outside Hudson, too No more broken CD drives No more CD-Rs
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Distributed builds with Hudson
> Master Serves HTTP requests Stores all important info
> Slaves 170KB single JAR Assumed to be unreliable Scale to at least 100
> Link Single bi-di byte stream No other requirements
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How master and slaves start talking
> For Unix slaves, via SSH Only need SSH and JRE on slaves We just need a host name
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How master and slaves start talking
> For Windows, DCOM We just need admin user name and password No manual intervention Works even from Unix masters
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How master and slaves start talking
> Via Java Web Start When master cannot see slaves A separate socket connection is made
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Automating JNLP launch
> Once started, can be installed as Windows service
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Automating JNLP launch
> Emulate the JNLP client headless
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$ java -jar slave.jar -jnlpUrl URL
Automated Tool Installation - JDK
> JDK from http://java.sun.com/ Hudson automatically chooses the right bundle Always up to date with new releases
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Automated Tool Installation - Apache
> Ant and Maven from Apache
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Automated Tool Installation - Custom
> Download arbitrary archive and unpack
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Automated Tool Installation - Custom
> Run arbitrary shell commands Can have variants by OS
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Automated Tool Installation - Extensible
> Write your own Simple Hudson extension Just write Java code to create tool on slave
> In progress: SCMs – Mercurial, … Install from Subversion
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Heterogeneous Cluster Challenge
> Your builds/tests need to run in specific environment
> Dependency on individual nodes hurts utilization
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WombatWindows test
WombatWindows test
Hudson Windows test
Hudson Windows test
Windows #1
Windows #1
jobs slaves
GlassFishWindows test
GlassFishWindows test
Windows #2
Windows #2
Solaris#1
Solaris#1
Hudson Solaris test
Hudson Solaris test
Labels to rescue
> Label is a group of slaves> Tie jobs to labels
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WombatWindows test
WombatWindows test
Hudson Windows test
Hudson Windows test
Windows #1
Windows #1
jobs slaves
GlassFishWindows test
GlassFishWindows test
Windows #2
Windows #2
Solaris#1
Solaris#1
Hudson Solaris test
Hudson Solaris test
WindowsWindows
SolarisSolaris
Windows #3
Windows #3
Forecasting failures
> Hudson monitors key health metrics of slaves Low disk space, insufficient swap Clock out of synch Extensible
> Slaves go offline automatically> Catch problems before they break builds
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Clean up mess after builds
> Kill runaway processes Daemons, background processes left by your build Works on Windows, Linux, Mac, and Solaris
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Load Statistics Monitoring
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When it’s time to add more slaves
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Hudson made this extensible
> Hudson detects excessive workload> Hudson notifies plugins> Plugins can provision more slaves
… assuming that you have that infrastructure
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Amazon EC2: The Good
> Pay as you go (10¢/h or so) Loads on Hudson tend to be spiky
> Programmable API> Instances launch at machine-speed> EC2 instances are forgetful
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Amazon EC2: The Bad
> Your data is still inside your firewall Takes time to check out code … or to archive build artifacts Some data just can’t be moved
> EC2 instances are forgetful> Can your tests run in parallel?
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Hudson EC2 plugin
> Built on top of typica*> What does it do?
Automatically provisions slaves on EC2 on demand Picks the right AMI depending on demand Starts slave agent Shuts down unused instances
38* http://code.google.com/p/typica/
Putting it all together
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time
# of
exe
cuto
rs
capacity
usagequeue length
Hudson “Appliance” on EC2
> Run the master in the cloud too, if you like Hudson on stock OpenSolaris AMI Data stored persistently in Elastic Block Storage
Dynamically expandable thanks to ZFS Online, too
> Packaged as a wizard
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> Hudson Hadoop plugin Just a few mouse clicks to install Turn every Hudson slave into a Hadoop node
> Distributed file system Automatic data replication (fault tolerant) Nice for storing old artifacts, logs, test records, …
> Map/reduce framework Large scale test results analysis / datamining More interesting work to be done in the future
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Hudson Selenium Plugin
> Selenium Tests webapps by scripting browsers
> Selenium Grid Runs Selenium over a grid of computers
> Allow Hudson labels to specify where to start browsers
> Hudson & Selenium both need heterogeneous cluster
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Selenium Grid
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Hudson master(selenium hub)
Hudson slaves
Conclusion
> CI is here to stay We’ll continue to push more workload to servers
> Hudson makes this easy for you> Reap the benefit of a cluster in multiple ways
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Resources
> http://hudson.dev.java.net/
> BOF-5105 “Hudson Community Meet up” Today 7:45pm same room
> Hudson booth inside Sun Pavilion
> Support Subscription [email protected]
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Agenda
> Quick Hudson introduction> Doing distributed builds> How Hudson make distributed builds easier> Taking infrastructure to cloud
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Setting up slaves
> Keeping slaves consistent is a good thing Particularly hard on heterogeneous environment
> General system administration tasks Network configuration Package installations for native tools Tools like Puppet or cfEngine are supposed to help
> Install build tools in the cluster Prepare tools on one file system rsync to everywhere
> This part of Hudson needs improvements50
Hudson EC2 plugin usage
> Tell Hudson your AWS account information
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Hudson EC2 plugin usage
> Tell Hudson what AMIs you want to start
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