Running Chromium inside Docker – Gtk: cannot open display: :0

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i don’t know much about chromium, but, I did work with X way back when 🙂 When you tell an X client to connect to :0, what you are saying is connect to port 6000 (or whatever your X server runs on) + 0, or port 6000 in this case. In fact, DISPLAY is IP:PORT (with the +6000 as mentioned above). The X server is running on your host, so, if you set:

DISPLAY=your_host_ip:0

that might work. However, X servers did not allow connections from just any old client, so, you will need to open up your X server. on your host, run 

xhost +

before running the docker container. All of this is assuming you can run chromium on your host (that is, an X server exists on your host).

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