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docker.md

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Docker

-- Twitter @slace / 2017 https://www.youtube.com/watch?v=i7yoXqlg48M

  • virtual machines vs containers

    • container runs natively on Linux and shares the kernel of the host machine with other containers. It runs a discrete process, taking no more memory than any other executable, making it lightweight.
    • a virtual machine (VM) runs a full-blown “guest” operating system with virtual access to host resources through a hypervisor. In general, VMs provide an environment with more resources than most applications need.

  • docker provides

    • a/many linux container(s)
      • user space isolation
      • process isolation
      • the ability to run an application with no system dependencies

  • image

    • OOP equivalent: a class definition
    • what you start from
    • what you produce as an output
    • an executable package that includes everything needed to run an application
      • the code
      • a runtime
      • libraries
      • environment variables
      • configuration files

  • container

    • OOP equivalent: the implementation of the class
    • a runtime instance of an image
      • what the image becomes in memory when executed
        • i.e. an image with state, or a user process

  • host machine

    • the machine which is running docker

  • interacting with docker

    • commandline docker command options arguments

docker references