Run GUI apps and Firefox with Docker for Mac 2017

This article introduce how to run GUI apps and Firefox with Docker for Mac, the purpose is just for fun, maybe can be used for build Website test automation with docker, you can check this.

All the commands below are tested with Docker 17.03.0-ce, macOS 10.12.3 and XUbuntu 16.04.2.

It include three sections here:

1. How to run GUI for Linux

2. How to run GUI for macOS

3. How to write Firefox Dockerfile

If you don't have so many times, you can just read Finally commands on each end of section :)

How to run GUI for Linux

Let's start with a normal GUI app xeyes, here is the Dockerfile based on Alpine Linux:

FROM alpine:latest
MAINTAINER playniuniu@gmail.com

RUN apk add --no-cache --update xeyes

CMD xeyes

You can built your own images with docker build -t xeyes ..

To run Docker GUI on Linux, You need 3 steps here:

1. Add docker's X11 authority

2. Set $DISPLAY environment for Docker

3. Loading X11 sockets for Docker

Finally commands

1. Build Dockerfile

   docker build -t xeyes .

2. Add X11 authority

   xhost + local:docker

3. Run docker GUI apps

   docker run --rm \
              -e DISPLAY=unix$DISPLAY \
              -v /tmp/.X11-unix:/tmp/.X11-unix \
              xeyes

Now you can see an X11 xeyes apps in your screen.

How to run GUI for macOS

The macOS is a little more complicate for it's lack of X-Window system,

so you need extra two steps to run GUI apps on macOS when you finished build xeyes images.

1. Establish the X11 server

2. Forward linux X11 socket to macOS X11 server ( Important! )

Notes: Lots of articles online lack of the second step, so cannot successfully run GUI on macOS.

For the two steps above, you need install two softwares here:

1. XQuartz, you can install it with brew cask install xquartz

2. socat, you can install it with brew install socat

Finally commands

So finally, you need five steps for run GUI apps on macOS:

1. Forward X11 socket

   socat TCP-LISTEN:6000,reuseaddr,fork UNIX-CLIENT:\"$DISPLAY\"

2. Check your macOS's ip

   export MAC_IP=$(ifconfig en0 | grep inet | awk '$1=="inet" {print $2}')

3. Add X11 authority ( optional )

   xhost + $MAC_IP

4. Open XQuartz software

5. Run Docker GUI apps

   docker run --rm \
          -e DISPLAY=$MAC_IP:0 \
          xeyes

Now, you can see xeyes on your macOS.

How to write Firefox Dockerfile

For Firefox, all the command steps are same, but you can not just simply replace the package xeyes with Firefox. The Firefox's Dockerfile need some extra steps below to reach the goal:

1. Install dbus-x11 package

2. Install a fonts for Firefox

3. Change to normal user to run Firefox

4. Prepare a profile folder for Firefox or use firefox --new-instance

The Dockerfile example is here:

FROM alpine:latest
MAINTAINER playniuniu@gmail.com

ENV URL https://www.google.com

RUN apk --no-cache --update add firefox-esr dbus-x11 ttf-ubuntu-font-family \
    && adduser -S normaluser \
    && echo "normaluser:normaluser" | chpasswd

USER normaluser

CMD firefox --new-instance ${URL}

You can also check my GitHub from more detail.

Finally commands

For Linux Platform, you can run Firefox with docker with:

1. Add X11 authority

   xhost + local:docker

2. Run Firefox in Docker

   docker run --rm \
              -e DISPLAY=unix:$DISPLAY \
              -v /tmp/.X11-unix:/tmp/.X11-unix \
              --name firefox \
              playniuniu/docker-gui-firefox

For macOS platform, same five steps as above:

1. Forward X11 socket

   socat TCP-LISTEN:6000,reuseaddr,fork UNIX-CLIENT:\"$DISPLAY\"

2. Check your macOS's ip

   export MAC_IP=$(ifconfig en0 | grep inet | awk '$1=="inet" {print $2}')

3. Add X11 authority ( optional )

   xhost + $MAC_IP

4. Open XQuartz software

5. Run Docker GUI apps

   docker run --rm \
          -e DISPLAY=$MAC_IP:0 \
          playniuniu/docker-gui-firefox

Reference

1. How to run a Linux GUI application on OSX using Docker

2. Docker for Mac and GUI applications

3. Running GUI apps with Docker

4. chrisdaish/docker-firefox

5. SeleniumHQ/docker-selenium