Docker

Concept

• Image
  • is a special filesystem
  • layer structure
• Container
  • running instance
  • layer structure
  • lost storage while container is stopped or closed
  • Volume: data persistent
• Repository

Image

• get images from docker registry: docker pull repo
• run an image: docker run repo
• list images: docker image ls
• delete images: docker image rm
• commit changes on container to new image: docker diff, docker commit
• customize: docker build builds an image from a Dockerfile and a context
  • FROM: base image
  • RUN: each directive create a new commit
  • COPY, ADD: copy file from context, ADD is more advance version of COPY
  • CMD: run the container process. Once the process exit, container stop.
  • VOLUME: define anyonmouse volume mount point
  • EXPOSE: expose container port to host

Volumes

• create a volume: docker volume create
• mount a volume: --mount

Compose

Defining and running multi-container Docker applications