Docker

Docker

https://unixism.net/2020/06/containers-the-hard-way-gocker-a-mini-docker-written-in-go/

add to docker notes: https://jdlm.info/articles/2019/09/06/lessons-building-node-app-docker.html

Ports

Docker

• -p,--publish [HOST:]CONTAINER -- if no HOST, it gets ephemeral host port

• -P,--publish-all -- all container's EXPOSEd to ephemeral host port

• Dockerfile: EXPOSE PORT[/PROTO]

  • Ever used by kube?
  • Ever used by docker-compose?
  • Seemingly not :-(

The EXPOSE instruction does not actually publish the port. It functions as a type of documentation between the person who builds the image and the person who runs the container, about which ports are intended to be published.

• https://docs.docker.com/engine/reference/builder/#expose

docker-compose

• ports: '[HOST:]CONTAINER' -- as above
• expose: 'CONTAINER' -- exposes port to other services, but not the host

Cleanup

• https://linuxize.com/post/how-to-remove-docker-images-containers-volumes-and-networks/

  docker system prune -a docker system prune --volumes docker container prune

Remove all images: docker rmi $(docker images -a -q)

Docker image and container exploration

• dive: go get github.com/wagoodman/dive

• https://github.com/wagoodman/dive

• docker container inspect

• docker diff

• docker image history

• docker image inspect