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Docker

Package an app once, run it anywhere. Build images that don't double in size every Friday.

Hands-on labsbeginner22 labs
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You can still start this course now. Earlier courses give you the mental model the labs here assume.

By the end you'll be able to
  • Build images that don't ship your .env file
  • Debug a running container without rebuilding
  • Compose multi-service stacks locally
  • Read a Dockerfile and predict what it'll produce

Modules

Work through the labs in order. Each module builds one operating habit.

  1. 01
    Container vs virtual machine
    Form a mental model of how a container differs from a virtual machine so the rest of the Docker labs make sense.
    10 min
    Start
  2. 02
    Image vs container
    Pull a small image, start two containers from it, and see one image produce many running instances.
    12 min
    Start
  3. 03
    Image layers and copy-on-write
    Look inside an image to see the layer stack, then write a file in a running container to see copy-on-write at work.
    12 min
    Start