docker.md

Docker

• Install from the Setup section
• Usage
  • Docker

    # show running containers
    docker ps
    
    # show images
    docker images
    
    # build docker image and tag
    docker build -t helloworld .    # --no-cache=true
    
    # run image with interactive tty and remove container after
    docker run -it --rm helloworld
    
    # override entrypoint
    docker run -it --rm --entrypoint=bash helloworld
    
    # run image with volume mount and published port (host:container)
    docker run -it --rm -v $(pwd):/app -p 80:5000 helloworld
    
    # run image in background (detached) with shortened name 'hello'
    docker run -it -d --name hello helloworld
    
    # exec into container
    docker exec -it helloworld bash
    
    # stop container
    docker stop hello
    
    # show all containers
    docker ps -a
    
    # remove volume
    docker rm -v <container_sha>
    
    # clean up images
    docker rmi helloworld

  • Docker Compose

    # clean build (remove `--no-cache` for speed)
    docker-compose build --no-cache --parallel
    
    # start container
    docker-compose up --remove-orphans -d
    
    # ssh into container (`exec` is more useful if the entrypoint is running a process/server)
    # docker attach hello-world
    docker exec -it hello-world bash
    
    # stop container
    docker-compose stop
    
    # destroy container and network
    docker-compose down

Debugging

• Watch logs in real-time: docker-compose logs -tf --tail="50" hello
• Check exit code

  $ docker-compose ps
  Name                          Command               State    Ports
  ------------------------------------------------------------------------------
  docker_python      python manage.py runserver ...   Exit 0