• install Boot2Docker.pkg
• user guide: https://docs.docker.com/userguide
• example docker environment: http://bit.ly/1NSJo51
• example web app: http://bit.ly/1dMcCFG
• CodeDojo dev environment: https://github.com/deviant-io/codedojo-docker
• slides: http://bit.ly/1RlkUqu

the most basic example

$ docker run ubuntu:14.04 /bin/echo 'Hello world'

basic command

$ docker run hello-world

• grabs the container (from dockerhub)
• launches it (the daemon)
• allows you to send messages to and from it

container

a stripped down version of linux

image

• container + other apps
• list all locally installed images with docker images

another example

$ docker run docker/whalesay cowsay Hello, Whitney!

an interactive container

$ docker run -t -i ubuntu:14.04 /bin/bash

building an image

create a Dockerfile.

# Dockerfile
FROM docker/whalesay:latest
RUN apt-get -y update && apt-get install -y fortunes
CMD /usr/games/fortune -a | cowsay

build it. docker-whale will be the name of the image.

$ docker build -t docker-whale .

other commands

$ docker version
$ docker ps  # view running processes
$ docker kill process-name  # kill a process
$ docker logs process-name
$ docker stop process-name
$ docker top process-name
$ docker inspect process-name

Dockerfile - RUN vs CMD

RUN - you should only run a single process in a single container. mostly used to run apt-get. CMD - should be used to run the software contained by your image

Dockerfile instructions

• FROM
• RUN
• CMD
• EXPOSE
• ENV
• ADD
• COPY
• ENTRYPOINT
• VOLUME
• USER
• WORKDIR
• ONBUILD

daemonize a command

$ docker run -d ubuntu:14.04 /bin/sh -c "while true; do echo hello world; sleep 1; done"

stop a daemon

$ docker stop romantic_kowalevski

running a webapp

$ docker run -d -P training/webapp python app.py