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12-factor-apps-and-kubernetes.md

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12 FACTOR APPS AND KUBERNETES

@kelyseyhightower One of the foremost contributors to the container community (kubernetes.io)

  • The twelve-factor app and all this container stuff
    • twelve-factor pattern becoming a requirement
    • When you write an app you should be able to deploy anywhere
  • What is a scheduler?
    • Utility computing
    • 1-click deployment script?
      • Problem: resource considerations
    • Tetris to illustrate (OpenEmu), 1 click deploy and step away, wasted space
      • Scheduler is smarter about how workloads are managed, what servers are used
      • Bit-packing
      • Schedulers, like a good Tetris player, makes good use of the available space
  • What about non-startups? Those companies that actually make money
    • Infrastructure not so pretty
  • What’s required to do this 12-factor thing?
    • Good practices, but not necessarily best practices
    • No deployment scripts
    • Focus on the workload
    • Like FedEx, put it in a box, 🚢 it
      • If it breaks, that’s on you
      • This is where containers come in, don’t tell me about the app, put it in a box and ship it
  • The twelve factors
    • Version control
    • Dependencies
      • Containers take this factor to the next level
      • Containers allow you to bring in your dependencies next to your app
    • Config
      • Store config solely in environment variables
        • Can be relaxed… Maybe the environment can be dynamic?
    • Backing services
    • …
    • http://12factor.net/
  • Free tip! Start up nicely (log), shut down cleanly (SIGTERM)
  • Deploy
    • Have a container
    • Push it to docker hub, for example
    • Describe your app
      • e.g. services/frontend.yaml
      • kubectl to query, spawn, etc services
    • In Docker, where do you put your configuration files?
      • Filesystem that only lives in memory, injected into the application
    • A pod, ?a logical component for multiple containers?

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Tue Jun 28 11:03:22 PDT 2016