feature flagging your infrastructure for fun and profit
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Feature Flagging your Infrastructure for Fun and
Pro!tDaniel Schauenberg
dschauenberg@etsy.com@mrtazz
Tuesday, September 10, 13
Tuesday, September 10, 13
LAMMP
Item by TheBackPackShoppe
Tuesday, September 10, 13
Item by FrankelPhotos
Monolithic App
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Etsy Infrastructure
• ~1400 nodes
• ~30 dev & ops engineers making changes regularly
• Open Source Chef server + GitHub Enterprise
• Default environment setup (production, development, testing)
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jonlives/knife-spork
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knife-spork
• Work!ow to manage cookbook and environment changes
• Versioned cookbooks and pinned environments
• Speci"c work!ow, di#erent ways of using plugins
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% chef-shellchef > recipe_modechef:recipe > echo offchef:recipe > include_recipe "apache"chef:recipe > run_chef
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% review -r jcowie --cc ops
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% knife spork check apache% knife spork bump apache% git commit% git push% knife spork upload apache
Staging DeployTuesday, September 10, 13
jonlives/knife-!ip
% knife node flip node.etsy.com testing% knife role flip testRole testing
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% knife spork promote apache% git commit% git push% knife spork promote apache --remote
Production DeployTuesday, September 10, 13
Monitoring
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19:18:06 irccat | CHEF: Daniel Schauenberg promoted apache@0.0.2 to development https://github.etsycorp.com/gist/12345
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etsy/chef-handlers19:20:00 irccat | Chef run failed on test.etsy.com19:20:00 irccat | https://github.etsycorp.com/gist/12347
jgoulah/knife-lastrun
% knife node lastrun test.etsy.com
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Graphs!
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Downsides
• Longer testing blocks others
• Staged cookbooks can accidentally be promoted
• Testing environment a#ects more than one cookbook
• Used “upgrade” environments to circumvent
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Feature Flags
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Branching in Code
• Well established pattern for “dark launches”
• Used in the Etsy Web stack
• Allows for restricted roll outs
• http://code.!ickr.net/2009/12/02/!ipping-out/
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Tuesday, September 10, 13
etsy/chef-whitelist
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chef-whitelist
• Data bag driven whitelist
• Library to include in cookbooks
• Easy access to feature !ags
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whitelist data bag{ "id": "my_whitelist", "patterns": [ "host.example.com", "*.subdomain.example.com", "prefix*.example.com" ]}
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whitelist data bag{ "id": "my_whitelist", "patterns": [ "host.example.com", "*.subdomain.example.com", "prefix*.example.com" ], "roles": [ "Webserver", "DatabaseServer" ]}
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feature !ags in recipe
if node.is_in_whitelist? "my_whitelist" # new hawtnesselse # old stuffend
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Customizable
node.is_in_whitelist? "my_whitelist", "acl", "hosts"
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real worldexample
{ "id": "php-5-4-19", "patterns": [ "dschauenberg.vm.dev.etsy.com", "web0270.etsy.com", "api04.etsy.com", "imgcache01.etsy.com", "imgwriter01.etsy.com", "worker01.etsy.com", "beacon01.etsy.com", "paymentsweb01.etsy.com" ], "roles": [ ]}
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Advantages
• Easy to access list of what gets upgrades
• Upgrades don’t need the spork work!ow
• Pattern already known by all engineers
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Downsides
• Changes outside the regular work!ow
• No graphs (yet)
• Less visible cleanup required
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Summary
• GitHub Enterprise, Dev VMs, chef-shell as development environment
• Chef Server and knife-spork as Deployment System
• Feature !agging with chef-whitelist
• Monitoring, Noti"cations, Graphs
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• http://codeascraft.etsy.com/
• http://codeascraft.com/2013/08/02/infrastructure-upgrades-with-chef/
• http://www.slideshare.net/jonlives/michelin-starred-cooking-with-chef
• http://www.slideshare.net/mcdonnps/lessons-from-etsy-avoiding-kitchen-nightmares-chefconf-2012
• https://github.com/etsy
Further information
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Thank you!Questions?
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Feature Flagging your Infrastructure for Fun and
Pro!tDaniel Schauenberg
dschauenberg@etsy.com@mrtazz
Tuesday, September 10, 13
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