How build and deployment should shape software architectures

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How build and deployment should shape software architectures Matthew Skelton CEng | thetrainline.com IASA UK Ignite 2, London | #iasaignite 10 September 2012

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Systems engineering (robotics, control theory, sensors, neuroscience) Software development (finance, insurance, travel, pharma, media, medical imaging) now Build & Deployment at thetrainline.com @matthewpskelton

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architecture = f (build & deploy) (for some systems)

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“HERESY!”

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RELIABLE REPEATABLE RAPID RECURRING

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Web-based Frequently- changing Public-facing High-volume

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‘R-R-R-R’ BUILD AND DEPLOYMENT Helps to avoid the Ball of Mud

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BUILDABLE Small pipelined builds on generic build machines Seconds, not minutes or hours Short feedback cycles (Dan Worthington-Bodart, @danielbodart - http://bit.ly/M85wsX)

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TESTABLE Test (separation, harnesses, points) IDENTIFIABLE Meaningful versions, packages, defined dependencies, artefact management (think component boundaries)

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DEPLOYABLE Rapid, scriptable, simple failure modes MONITORABLE Logging, metrics, transaction tracing CONFIGURABLE Inject settings – no ‘black boxes’ LIGHTWEIGHT Keep things small and easily comprehendible

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INSTANTIABLE No snowflakes or singletons RECOVERABLE No nasty zombies after failures MTTR more important than MTBF* * for most kinds of F

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RELIABLE REPEATABLE RAPID RECURRING

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Lightweight, Testable, Monitorable, Configurable, Recoverable, Identifiable component architecture

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LOAD BALANCING HIGH AVAILABILITY SCALING ELASTIC ARCHITECTURES RAPID RECOVERY

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architecture = f (build & deploy) (for some systems) thank you IASA: www.iasaglobal.org matthewskelton.net | @matthewpskelton Thanks to: Attila S, Jack R and Owain P for feedback. Picture credits: Petra: Wikimedia/Berthold Werner; army engineers: US DoD; ball of mud: pwern.blogspot.co.uk; sports car: xarj.net; zombie: bjj.org; feather: Wikipedia; punch: thelegalblitz.com; passport: coverpalace.com; dogs: reluctantmemsahib.wordpress.com; Meccano: dalefield.com