Docker notes

docker_notes

Container states
    non-existant
    running
    stopped
    paused

Image info
    docker images # list images

Image operations
    docker pull IMAGE
    docker rmi IMAGE
    docker build --rm -t hcs42/myproject:v1 .  # new image

Container info
    docker ps [-a]    # list containers
    docker top CONTAINER
    docker logs [-f] CONTAINER
    docker port CONTAINER PRIVATE_PORT

Container operations
    docker run IMAGE CMD...  # non-existant -> running (image -> container)
    docker stop CONTAINER    # running -> stopped
    docker start CONTAINER   # stopped -> running
    docker pause CONTAINER   # running -> paused
    docker unpause CONTAINER # paused -> running
    docker rm CONTAINER      # stopped -> non-existant
    docker commit CONTAINER IMAGE # container -> image

docker run parameters
    --name NAME
    -a # Attach
    -d # Detached
    -e ENVVAR=VALUE
    -p 127.0.0.1:5000:5000
    -u USER

docker run examples
    docker run ubuntu:14.04 /bin/echo 'Hello World'
    docker run -t -i ubuntu:14.04 /bin/bash
    docker run -d ubuntu:14.04 /bin/sh -c "while true; do echo hello; sleep 1; done"
    docker run -d -P training/webapp python app.py
    docker run -d -p 5000:5000 training/webapp python app.py
    docker run -d -p 127.0.0.1:5000:5000 training/webapp python app.py
    docker run -d -p 127.0.0.1:5000:5000/udp training/webapp python app.py

Check disk space used by images:
    sudo sh -c "du -sm /var/lib/docker/aufs/diff/*"

Dockerfile: https://docs.docker.com/reference/builder/
    FROM ubuntu:14.04
    RUN apt-get -qq update
    ADD <file> <path_in_container>
    EXPOSE <port>
    USER <username>