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©2013 CloudBees, Inc. All Rights Reserved 1©2013 CloudBees, Inc. All Rights Reserved
Next Step in Automation:Elastic Build EnvironmentKohsuke Kawaguchi / CloudBees, [email protected] / @kohsukekawa
Jesse Glick / CloudBees, [email protected] / @tyvole
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Have You Met Jenkins? http://jenkins-ci.org/
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32%
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18%
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My Jenkins around 2006
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Workload
http://www.flickr.com/photos/gbyrnes/912576883/
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If only we had more computers…
• Just building & testing them all…• Running tests more frequently• Testing individual commits
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What you don’t wanthttp://www.flickr.com/photos/drocpsu/8546730021/
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Just enough computersjust in time
Elasticity
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My Jenkins around 2007
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©2013 CloudBees, Inc. All Rights Reserved 17http://www.flickr.com/photos/drocpsu/8546730021/
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But not this, either
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Just enough computersof the right kind
just in time
Elasticity!
©2013 CloudBees, Inc. All Rights Reserved 20http://www.flickr.com/photos/82219206@N00/7003641975/
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Correct answer
• Test assumes a fixture running on port 8080– Doesn’t check if it’s already being used
• If another test runs at the same time…?
©2013 CloudBees, Inc. All Rights Reserved 22http://www.flickr.com/photos/82219206@N00/7003641975/
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Correct answer
• Because of “pkill -f -9 tomcat” cleanup
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Isolation
http://www.flickr.com/photos/jumilla/8667648797/
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Isolation
• At odds with large multi-core systems
• x86 virtual machines• User isolation• Kernel containers
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!
©2013 CloudBees, Inc. All Rights Reserved 27http://www.flickr.com/photos/82219206@N00/7003641975/
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Correct answer
• Same Maven ID, two different jars
• Different projects designate different ones
• Local cache gets cleaned up periodically
• Whichever first runs after cache cleanup “wins”
©2013 CloudBees, Inc. All Rights Reserved 29http://www.flickr.com/photos/82219206@N00/7003641975/
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Correct answer
• Test script leaves background daemon process behind
• Over time it’ll slowly choke slaves
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Throw away & create new
Elasticity!
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Ladder to Cloud
Single
MultipleElastic
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Solid OSS Elasticity Plugins
• EC2 plugin• Jclouds plugin– OpenStack, CloudStack
• Launch and tear down slaves on demand
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VMWare auto-scaling plugin
• Snapshot• Power on-off management• Hypervisor-aware scheduling• Folder based pooling• VMWare tools integration• One-time use support
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Host that runs Docker
Docker plugin
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Mansion
Slave Slave
Slave Slave
CloudBees DEV@cloud
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Maven
Git
Ant
Mercurial
Gradle
Subversion
Linux Kernel
Hardware
Linux Container = zero cost virtualization
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For OS X
Maven
Git
XCode
Git
XCode
Subversion
OS X OS X OS X
QEMU QEMU QEMU
Linux Kernel
Apple Hardware
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Kernel Same-page Merging
OS X OS X OS X
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Mansion
Slave
Slave
Slave
Workspace 1
Workspace 2
Workspace 3
Workspace 4
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Slave
Slave
Workspace
Workspace’’
Workspace’
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Slave
Slave
~/.m2/repository
~/.m2/repository
~/.m2/repository
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Parallel Testing
Test Group #1 Test Group #2 Test Group #3
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Parallel Testing
foo #10 Test Group #1
foo #11 Test Group #2
foo #12 Test Goup #3
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Validated Merge
upstreamrepo
gate repo
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Workflow
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Workflow System
• Alternative to “freestyle” projects• Scripted control flow• Resumable execution across restarts• All-in-one build/test/deploy pipelines• Under active development
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Workflow with Elastic Slaves
• One-line provisioning from cloud• Language-level parallelism• Run commands, archive files, test
results• Now integrates with parallel test plugin
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Demo
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Conclusion: Elasticity Benefits
• Just-in-time capacity• Diversity without overhead• Isolation• Productivity gain– parallel testing– validated merge– workflow
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