`DISPLAY=:1 firefox` within a LXC to a vncserver [kinda-solved]

Setup: On my host machine, I have a vncserver running in on port 5901. I also have a linux container running.
Goal: Run a command in a linux container and have it display a GUI program in the vncserver.
What works:
* From the host, open a terminal and run `DISPLAY=:1 firefox` and a firefox loads inside the vncserver.
* From the container (ssh or lxc-attach), run `DISPLAY=:0 firefox` and a firefox from the container loads inside my Xsession on the physical display.
What doesn't work:
* From the container (ssh or lxc-attach), run `DISPLAY=:1 firefox` which ends in this error:
No protocol specified
Error: cannot open display: :1
Now, it DOES work with this insecure hack so I know nothing is setup incorrectly in the container or the vncserver:
1) In the vncserver, run `xhost +`
2) From the container (ssh or lxc-attach), run `DISPLAY=:1 firefox` and a firefox from the container loads inside my vncserver.
So what am I doing incorrectly?
Last edited by graysky (2015-04-24 19:16:49)

If it works after you do 'xhost +' in the vncserver then that points to an authentication issue. Something less insecure would be 'xhost +local' or you could try 'xhost +si:hostname:lxc_hostname' where lxc_hostname is the hostname configured inside the container (not sure if this will work though; I have zero experience with lxc so I don't know if this applies). There is also the option of restricting by username but that should be a local username I suppose, xhost's man page is a bit terse on this.
I suspect you are going to be pulling your hair trying to sort this out the way you want but it should be possible, get yourself enough cookies and coffee and dive into the man pages. Some googling and lots of trial and error will be needed.

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