[lxc-users] Graphics and sound with LXD

Fri Apr 1 01:11:59 UTC 2016

 >I don't know if you got the script from  Stéphane's LXC article 
(https://www.stgraber.org/2014/02/09/lxc1-0-gui-in-containers/), but in 
it he say's it is used to "tell pulseaudio on the host to bind 
/home/ubuntu/.pulse_socket in the container, checking that it’s not 
already setup."

Well initially I got the script from flockport but went back to 
Stéphane's LXC article 
(https://www.stgraber.org/2014/02/09/lxc1-0-gui-in-containers/) and did 
realize that I was using a script for privileged containers. Fixed the 
script and it is still having problems. The script when executed 
manually does not return any errors however pulse still does not export 
in the container and the .pulse_socket is not created in /home/ubuntu 
directory of the container and yes I specified the entire correct path 
in the script.
I believe the problem may be id mapping as described in the 
aforementioned blog series. The following would be added to the lxc 
config file:

lxc.id_map = u 0 100000 1000
lxc.id_map = g 0 100000 1000
lxc.id_map = u 1000 1000 1
lxc.id_map = g 1000 1000 1
lxc.id_map = u 1001 101001 64535
lxc.id_map = g 1001 101001 64535

the user ubuntu in the container needs to be mapped to the same user id 
as the normal user in the host. I am unaware of how this can be done in 
the LXD config file or if an equivalent configuration can even be made 
with LXD.

I think that if someone knows how this can be done in the LXD config 
file, and also how hooks can be implemented, that sound could be quickly 
enabled. If someone has any ideas please feel free to share them.

 >Unfortunately I do not know how to translate that to LXD. As far as I 
can tell (by looking at the lxc-to-lxd script) hooks are not supported 
yet. Perhaps there is a workaround?

 >Could you please post an example of the lxd config commands you used 
to make your graphics work?

As I mentioned this was surprisingly easy. I found the following 
commands that someone had posted in an old lxc-users mailing. Sorry, I 
can not remember who it was.

lxc config device add qt5-development /dev/nvidia0 unix-char 
path=/dev/nvidia0

lxc config device add qt5-development /dev/nvidiactl unix-char 
path=/dev/nvidiactl

lxc config device add qt5-development /dev/nvidia-uvm unix-char 
path=/dev/nvidia-uvm

lxc config device add qt5-development /dev/video0 unix-char 
path=/dev/video0
lxc config device add qt5-development /dev/tty0 unix-char path=/dev/tty0

lxc config device add qt5-development /dev/tty7 unix-char path=/dev/tty7

lxc config device add qt5-development /dev/tty8 unix-char path=/dev/tty8

lxc config device add qt5-development /dev/fb0 unix-char path=/dev/fb0
e99dd6437665
lxc config device add qt5-development /dev/dri unix-char path=/dev/dri

lxc config device add qt5-development /dev/dri/card0 unix-char 
path=/dev/dri/card0

I replicated everything except the nvidia lines as they do not apply to 
me. Also I found that I was not able to "mount" directories with this 
command like /dev/dri and /dev/snd. I had to execute a line for each 
device in these directies such as /dev/dri/card0 and so on. After this 
the config file looked like the following:

name: gc1
profiles:
- default
config:
   volatile.base_image: 
e99dd64376651ed3b81bf312d2cfde1ef0a58ecd296a9ae4b654bda733f832ee
   volatile.eth0.hwaddr: 00:16:3e:0f:6d:36
   volatile.last_state.idmap: 
'[{"Isuid":true,"Isgid":false,"Hostid":500000,"Nsid":0,"Maprange":458752},{"Isuid":false,"Isgid":true,"Hostid":500000,"Nsid":0,"Maprange":458752}]'
devices:
   /dev/dri/card0:
     path: /dev/dri/card0
     type: unix-char
   /dev/dri/controlD64:
     path: /dev/dri/controlD64
     type: unix-char
   /dev/dri/renderD128:
     path: /dev/dri/renderD128
     type: unix-char
   /dev/fb0:
     path: /dev/fb0
     type: unix-char
   /dev/snd/controlC0:
     path: /dev/snd/controlC0
     type: unix-char
   /dev/snd/hwC0D0:
     path: /dev/snd/hwC0D0
     type: unix-char
   /dev/snd/hwC0D3:
     path: /dev/snd/hwC0D3
     type: unix-char
   /dev/snd/pcmC0D0c:
     path: /dev/snd/pcmC0D0c
     type: unix-char
   /dev/snd/pcmC0D0p:
     path: /dev/snd/pcmC0D0p
     type: unix-char
   /dev/snd/pcmC0D3p:
     path: /dev/snd/pcmC0D3p
     type: unix-char
   /dev/snd/pcmC0D7p:
     path: /dev/snd/pcmC0D7p
     type: unix-char
   /dev/snd/pcmC0D8p:
     path: /dev/snd/pcmC0D8p
     type: unix-char
   /dev/snd/seq:
     path: /dev/snd/seq
     type: unix-char
   /dev/snd/timer:
     path: /dev/snd/timer
     type: unix-char
   /dev/tty0:
     path: /dev/tty0
     type: unix-char
   /dev/tty7:
     path: /dev/tty7
     type: unix-char
   /dev/tty8:
     path: /dev/tty8
     type: unix-char
   /dev/video0:
     path: /dev/video0
     type: unix-char
   root:
     path: /
     type: disk
ephemeral: false

Then launched gc1 and ssh -X ubuntu at 10.0.1.16 and launched a browser and 
chromium-bsu. Both worked flawlessly but without sound.

 >I wonder why more people are not asking/answering questions about LXD 
GUI containers; information on the subject is very scarce. Even 
Stéphane's new series of LXD articles does not cover it. Is LXD not 
recommended for GUI use?

Me as well. it seems like an important use case. My guess is the 
developers are avoiding their creation getting labeled as yet another 
application container system.

On 03/31/2016 01:17 AM, lxc-users-request at lists.linuxcontainers.org wrote:
> Re: [lxc-users] Graphics and sound with LXD

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