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Dockerizing Apps

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This document discusses how to dockerize desktop applications like Firefox by running them in Docker containers with access to the host desktop, audio devices, and data volumes. It provides instructions for downloading Docker and example Dockerfiles, building images, and running Firefox in both ephemeral and stateful containers with various volume mounting techniques to access files on the host or in data containers.

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Twitter San Francisco, CA 2013-11-05 docker Dockerizing your applications Daniel Mizyrycki daniel@docker.com
Introduction Dockerizing a typical desktop application
Downloads * Download Docker wget -O docker http://get.docker.io/builds/Linux/x86_64/docker-latest * Download data and firefox Dockerfiles from contrib/desktop-integration wget http://raw.github.com/dotcloud/docker/master/ contrib/desktop-integration/data/Dockerfile wget http://raw.github.com/dotcloud/docker/master/ contrib/desktop-integration/firefox/Dockerfile
Building images with a Dockerfile * base image * load new packages * optional customization * optional addition of host files * optional run command
Data Dockerfile (Example of customization) # Smallest base image, just to launch a container from busybox maintainer Daniel Mizyrycki <daniel@docker.com> # Create a regular user run echo 'sysadmin:x:1000:1000::/data:/bin/sh' >> /etc/passwd run echo 'sysadmin:x:1000:' >> /etc/group # Create directory for that user run mkdir /data run chown sysadmin.sysadmin /data # Add content to /data. This will keep sysadmin ownership run touch /data/init_volume # Create /data volume VOLUME /data
Docker and the desktop: How to communicate with the desktop? Video: X11 unix socket. /tmp/.X11-unix/X0 Audio: Alsa. /dev/snd plus access to the physical devices
Launch Docker docker -d & Building containers cd data; docker build -t data -rm . cd firefox; docker build -t firefox -rm .
Running ephemeral Firefox container docker run -e DISPLAY=unix$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd -lxc-conf='lxc.cgroup.devices.allow = c 116:* rwm' firefox
Running stateful data-on-host Firefox container docker run -e DISPLAY=unix$DISPLAY -v /data/firefox:/data -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd -lxc-conf='lxc.cgroup.devices.allow = c 116:* rwm' firefox
Create dockerized data container docker run -name firefox-data data true Monitor status in the data container while true; do docker run -volumes-from firefox-data busybox ls -al /data sleep 3; clear; done
Running stateful firefox with dockerized data container docker run -e DISPLAY=unix$DISPLAY -volumes-from firefox-data -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd -lxc-conf='lxc.cgroup.devices.allow = c 116:* rwm' firefox
Dockerizing Apps

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Dockerizing Apps

  • 1. Twitter San Francisco, CA 2013-11-05 docker Dockerizing your applications Daniel Mizyrycki daniel@docker.com
  • 3. Downloads * Download Docker wget -O docker http://get.docker.io/builds/Linux/x86_64/docker-latest * Download data and firefox Dockerfiles from contrib/desktop-integration wget http://raw.github.com/dotcloud/docker/master/ contrib/desktop-integration/data/Dockerfile wget http://raw.github.com/dotcloud/docker/master/ contrib/desktop-integration/firefox/Dockerfile
  • 4. Building images with a Dockerfile * base image * load new packages * optional customization * optional addition of host files * optional run command
  • 5. Data Dockerfile (Example of customization) # Smallest base image, just to launch a container from busybox maintainer Daniel Mizyrycki <daniel@docker.com> # Create a regular user run echo 'sysadmin:x:1000:1000::/data:/bin/sh' >> /etc/passwd run echo 'sysadmin:x:1000:' >> /etc/group # Create directory for that user run mkdir /data run chown sysadmin.sysadmin /data # Add content to /data. This will keep sysadmin ownership run touch /data/init_volume # Create /data volume VOLUME /data
  • 6. Docker and the desktop: How to communicate with the desktop? Video: X11 unix socket. /tmp/.X11-unix/X0 Audio: Alsa. /dev/snd plus access to the physical devices
  • 7. Launch Docker docker -d & Building containers cd data; docker build -t data -rm . cd firefox; docker build -t firefox -rm .
  • 8. Running ephemeral Firefox container docker run -e DISPLAY=unix$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd -lxc-conf='lxc.cgroup.devices.allow = c 116:* rwm' firefox
  • 9. Running stateful data-on-host Firefox container docker run -e DISPLAY=unix$DISPLAY -v /data/firefox:/data -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd -lxc-conf='lxc.cgroup.devices.allow = c 116:* rwm' firefox
  • 10. Create dockerized data container docker run -name firefox-data data true Monitor status in the data container while true; do docker run -volumes-from firefox-data busybox ls -al /data sleep 3; clear; done
  • 11. Running stateful firefox with dockerized data container docker run -e DISPLAY=unix$DISPLAY -volumes-from firefox-data -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd -lxc-conf='lxc.cgroup.devices.allow = c 116:* rwm' firefox