cheatsheets/docker.md

Command line interface

Quick install on a server:

$ curl get.docker.io | sudo sh -x

To pull from docker's registry:

$ docker pull "ubuntu"

To build from your own Dockerfile:

$ docker build -t "app/container_name" .

To run:

$ docker run "app/container_name" [command and args]
  -i -t                # Interactive mode + pseudo-TTY
  -e ENVVAR=value      # Environment vars
  -p 4444              # Expose a port (??)
  -d                   # Detached mode

$ docker run -t "ubuntu" -i bash

OSX Install

Prerequisites:

• Install Virtualbox (brew install virtualbox)
• Install Vagrant (http://vagrantup.com)
• Install go (brew install go)

Then make the Docker executable:

$ git clone https://github.com/dotcloud/docker.git ~/src/docker
$ cd ~/src/docker
$ make
$ mv ./bin/docker /usr/local/bin/docker

Then run docker:

$ cd ~/src/docker
$ vagrant up

Managing

Manage images:

# List images
$ docker images
REPOSITORY   TAG        ID
ubuntu       12.10      b750fe78269d
me/myapp     latest     7b2431a8d968

# Delete an image
$ docker rmi b750fe78269d

Manage processes:

$ docker ps
$ docker kill $ID
$ docker rmi $ID

Manage containers:

Updating containers

$ docker commit "app/container_name" -m "Change stuff"

More

Start a worker

# Start a very useful long-running process
JOB=$(docker run -d ubuntu /bin/sh -c "while true; do echo Hello world; sleep 1; 
    done")

# Collect the output of the job so far
docker logs $JOB

# Kill the job
docker kill $JOB

Resources

• http://www.docker.io/gettingstarted/