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Continuous Deployment
 

Continuous Deployment

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  • What? Why? Tailor for unique tradeoffs, focusing on risk mitigation.Trans: what is cd? What is CI?
  • Incremental logical step. Coined the term, didn’t invent the concept.(IMVU took it to the next level, but others were doing very similar things before IMVU existed)
  • Ancient concept:Expect it on local dev boxes (php-style)SqueakGenera : An entire OS, locally deployable instantly. Musical Live CodingTrans: So… why?
  • Story? System Chat. Threw away a week of work! Dark launch via CD.Bad Assumptions: Code does what it says Code doesn’t negatively affect other code Code is scalable Code handles edge cases correctly 3rd party API allows for certain behavior
  • “Continuous Deployment” coined August 2007, 20k google hits (phrase is only 4 years old)Feb 2009: Blog post lands
  • Where we were: 2008Handful of companiesZero documentationNo common languageWhat changed?Pattern got a name.People started talking about it.
  • Talk through commit deploy processGit pushGithubPing JenkinsJenkins runs python ./manage.py test canvasRuns through a couple hundred automated tests
  • Does it scale?IMVU: Profitable MMO + Virtual Economy, 50 person technical staffCommit-to-live in about 15 minutes.Massive cluster, massive parallelism. Extensive stats tracking.
  • “Gregory House Theory”Not a theory of CDWaterfallApply the theory on a per-change basis (schemas vsTrans: How to change that curve?
  • Hypothesis commits: What happens if I X?Pay attention to your S/N ratio. Refactoring in separate commits to pull out noise. (Behavior preserving? Behavior changing?)
  • Bank that IVLots of “Lean Startup” and “Lean Thinking” benefits, covered elsewhere.
  • Flickr switchesChrome dev-channel crashes constantly, but I still love it. (WebGL!)Google Labs
  • Website is down! Write tests.“Install the client” test, fear barrier.
  • Nagios alerts are an extension of test coverage.Cluster Immune is a hedge against the cost of big regressions. Does a subset of Nagios alerts with finely tuned parameters.Instant rollback (<15s) is so critical. Human processes (how do I do it? Who does it? What’s a serious regression?)Just go read “Release It!” – Michael NygardCan’t take out a MySQL instance with a bad queryApp works even if search is downIsolation: Think AppEngine.Schemas: Lock down. Review. Try to avoid. Key-value store (NoSQL or YesSQL)
  • Schema changes are high friction; they’re often slow and expensive to deploy: most data stores fight the natural order of Continuous Deployment: small discrete schema changes.Everyone has established practices, patterns and unique situations given choice of database, Code works with schema v0 and v1 (i.e. adding a new row; code explicitly selects the columns it wants and ignores new row)Means you can always step the code and the database back (potentially multiple times, but that takes many steps)
  • Schema changes are computationally expensive and risky
  • Nike method: Just do itHot tub method: Ease into itNuclear option: quit your day job (amazon: switch teams)(Last one’s mostly a joke, but f you look at how the growth of agile methodologies: successful projects and dev environments attract talent; talent came from somewhere!)
  • Putting it all together, examples:Web Startup: forget riskEstablished Service: velocity  IMVU“Big Business”: CD to opt-in customers, daily deploy of baked functionality.Medical: CD to test-environment.Principles apply everywhere.

Continuous Deployment Continuous Deployment Presentation Transcript