Ubuntu Container - is it possible to have audio in a container

T

titust11

Member
Nov 18, 2021
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Hi
I've created an Ubuntu 22.04 container (not Docker). My MTB has a Realtek ALC1150, onboard.
I'm wondering if I can passthrough the audio crtl. to the container (I plan to install Pianobar a CLI based client of Pandora music streaming).
I've done that in the past with with a VM, but I can't find a way to do it with a container.
Or I can install a USB to Audio dongle on the machine and maybe it's easier to passthrough an USB Audio device
Thanks
 
Last edited:
Code: 
root@pve:~# ls -l /dev/snd
total 0
drwxr-xr-x 2 root root       60 Jul 15 20:00 by-path
crw-rw---- 1 root audio 116,  8 Jul 15 20:00 controlC0
crw-rw---- 1 root audio 116,  6 Jul 15 20:00 hwC0D0
crw-rw---- 1 root audio 116,  7 Jul 15 20:00 hwC0D2
crw-rw---- 1 root audio 116,  3 Jul 15 20:00 pcmC0D0c
crw-rw---- 1 root audio 116,  2 Jul 15 20:00 pcmC0D0p
crw-rw---- 1 root audio 116,  4 Jul 15 20:00 pcmC0D1p
crw-rw---- 1 root audio 116,  5 Jul 15 20:00 pcmC0D2c
crw-rw---- 1 root audio 116,  1 Jul 15 19:58 seq
crw-rw---- 1 root audio 116, 33 Jul 15 19:58 timer
I guess my device class number is 116. So I appended this to my 104.conf file
Code: 
lxc.cgroup2.devices.allow: c 116:* rwm
lxc.mount.entry: /dev/snd dev/snd none bind,create=dir
In the container machine I'm able to see the same items in ls -l /dev/snd, but I have no idea how to check the existence / functionality of a sound card.
Code: 
arecord -l
arecord: device_list:274: no soundcards found...
 
Last edited:
titust11 said:
Code: 
arecord -l
arecord: device_list:274: no soundcards found...
Click to expand...
Check the permissions. Is your user inside the container a member of the audio group? Did you lxc.idmap the audio group inside the container to the audio group of the host?
titust11 said:
In the container machine I'm able to see the same items in ls -l /dev/snd,
Click to expand...
What does it look like (ls -l /dev/snd/ and especially look at the permissions)?
titust11 said:
but I have no idea how to check the existence / functionality of a sound card.
Click to expand...
titust11 said:
(I plan to install Pianobar a CLI based client of Pandora music streaming)
Click to expand...
I think that a good test would be to see if Pianobar works, but I don't know anything about it.
 
leesteken said:
What does it look like (ls -l /dev/snd/ and especially look at the permissions)?
Click to expand...
admin@test:/root$ ls -l /dev/snd
total 0
drwxr-xr-x 2 nobody nogroup 60 Jul 16 00:00 by-path
crw-rw---- 1 nobody nogroup 116, 8 Jul 16 00:00 controlC0
crw-rw---- 1 nobody nogroup 116, 6 Jul 16 00:00 hwC0D0
crw-rw---- 1 nobody nogroup 116, 7 Jul 16 00:00 hwC0D2
crw-rw---- 1 nobody nogroup 116, 3 Jul 16 00:00 pcmC0D0c
crw-rw---- 1 nobody nogroup 116, 2 Jul 16 00:00 pcmC0D0p
crw-rw---- 1 nobody nogroup 116, 4 Jul 16 00:00 pcmC0D1p
crw-rw---- 1 nobody nogroup 116, 5 Jul 16 00:00 pcmC0D2c
crw-rw---- 1 nobody nogroup 116, 1 Jul 15 23:58 seq
crw-rw---- 1 nobody nogroup 116, 33 Jul 15 23:58 timer
 
I currently do this with a USB DAC and a privileged container running Ubuntu. (Not sure if it needs to be privileged.)

Code: 
root@pve:~# ls -la /dev/snd/by-id/
total 0
drwxr-xr-x 2 root root  60 Jul 24 16:58 .
drwxr-xr-x 4 root root 180 Jul 24 16:58 ..
lrwxrwxrwx 1 root root  12 Jul 24 16:58 usb-RME_ADI-2_DAC__51090980__0E92A13844401C8-00 -> ../controlC1

root@pve:~# ls -la /dev/snd/
total 0
drwxr-xr-x  4 root root      180 Jul 24 16:58 .
drwxr-xr-x 22 root root     4800 Jul 20 14:39 ..
drwxr-xr-x  2 root root       60 Jul 24 16:58 by-id
drwxr-xr-x  2 root root       60 Jul 24 16:58 by-path
crw-rw----  1 root audio 116,  4 Jul 24 16:58 controlC1
crw-rw----  1 root audio 116,  3 Jul 24 16:58 pcmC1D0c
crw-rw----  1 root audio 116,  2 Jul 24 16:58 pcmC1D0p
crw-rw----  1 root audio 116,  1 Jul 19 06:35 seq
crw-rw----  1 root audio 116, 33 Jul 19 06:35 timer

root@pve:~# cat /etc/pve/lxc/101.conf
arch: amd64
cores: 2
features: nesting=1
hostname: roon
memory: 4096
mp0: /raid/music,mp=/mnt/music
mp1: /raid/backups_roon,mp=/mnt/backups_roon
net0: name=eth0,bridge=vmbr0,firewall=1,hwaddr=56:68:4D:F5:F5:EF,ip=dhcp,ip6=dhcp,type=veth
onboot: 1
ostype: ubuntu
rootfs: local-zfs:subvol-101-disk-0,size=20G
swap: 512
lxc.cgroup2.devices.allow: c 116:* rwm
lxc.mount.entry: /dev/snd dev/snd none bind,optional,create=dir

root@pve:~# pct enter 101
root@roon:~# aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 1: DAC51090980 [ADI-2 DAC (51090980)], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
 
Thank you very much sir. Everything was right in my config, with one exception. In my container conf file I had unpriviledged=1. Yours did not have that. I removed the line, and I now can see the audio device:)
So the trick was the priviledged lxc. Thanks again.
Code: 
admin@pandora:/$ aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC1150 Analog [ALC1150 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC1150 Digital [ALC1150 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
 
Last edited:
nick.kopas said:
I currently do this with a USB DAC and a privileged container running Ubuntu. (Not sure if it needs to be privileged.)

Code: 
root@pve:~# ls -la /dev/snd/by-id/
total 0
drwxr-xr-x 2 root root  60 Jul 24 16:58 .
drwxr-xr-x 4 root root 180 Jul 24 16:58 ..
lrwxrwxrwx 1 root root  12 Jul 24 16:58 usb-RME_ADI-2_DAC__51090980__0E92A13844401C8-00 -> ../controlC1

root@pve:~# ls -la /dev/snd/
total 0
drwxr-xr-x  4 root root      180 Jul 24 16:58 .
drwxr-xr-x 22 root root     4800 Jul 20 14:39 ..
drwxr-xr-x  2 root root       60 Jul 24 16:58 by-id
drwxr-xr-x  2 root root       60 Jul 24 16:58 by-path
crw-rw----  1 root audio 116,  4 Jul 24 16:58 controlC1
crw-rw----  1 root audio 116,  3 Jul 24 16:58 pcmC1D0c
crw-rw----  1 root audio 116,  2 Jul 24 16:58 pcmC1D0p
crw-rw----  1 root audio 116,  1 Jul 19 06:35 seq
crw-rw----  1 root audio 116, 33 Jul 19 06:35 timer

root@pve:~# cat /etc/pve/lxc/101.conf
arch: amd64
cores: 2
features: nesting=1
hostname: roon
memory: 4096
mp0: /raid/music,mp=/mnt/music
mp1: /raid/backups_roon,mp=/mnt/backups_roon
net0: name=eth0,bridge=vmbr0,firewall=1,hwaddr=56:68:4D:F5:F5:EF,ip=dhcp,ip6=dhcp,type=veth
onboot: 1
ostype: ubuntu
rootfs: local-zfs:subvol-101-disk-0,size=20G
swap: 512
lxc.cgroup2.devices.allow: c 116:* rwm
lxc.mount.entry: /dev/snd dev/snd none bind,optional,create=dir

root@pve:~# pct enter 101
root@roon:~# aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 1: DAC51090980 [ADI-2 DAC (51090980)], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
Click to expand...
BTW what application are you using to play music on your USB DAC?
 
nick.kopas said:
I currently do this with a USB DAC and a privileged container running Ubuntu. (Not sure if it needs to be privileged.)

Code: 
root@pve:~# ls -la /dev/snd/by-id/
total 0
drwxr-xr-x 2 root root  60 Jul 24 16:58 .
drwxr-xr-x 4 root root 180 Jul 24 16:58 ..
lrwxrwxrwx 1 root root  12 Jul 24 16:58 usb-RME_ADI-2_DAC__51090980__0E92A13844401C8-00 -> ../controlC1

root@pve:~# ls -la /dev/snd/
total 0
drwxr-xr-x  4 root root      180 Jul 24 16:58 .
drwxr-xr-x 22 root root     4800 Jul 20 14:39 ..
drwxr-xr-x  2 root root       60 Jul 24 16:58 by-id
drwxr-xr-x  2 root root       60 Jul 24 16:58 by-path
crw-rw----  1 root audio 116,  4 Jul 24 16:58 controlC1
crw-rw----  1 root audio 116,  3 Jul 24 16:58 pcmC1D0c
crw-rw----  1 root audio 116,  2 Jul 24 16:58 pcmC1D0p
crw-rw----  1 root audio 116,  1 Jul 19 06:35 seq
crw-rw----  1 root audio 116, 33 Jul 19 06:35 timer

root@pve:~# cat /etc/pve/lxc/101.conf
arch: amd64
cores: 2
features: nesting=1
hostname: roon
memory: 4096
mp0: /raid/music,mp=/mnt/music
mp1: /raid/backups_roon,mp=/mnt/backups_roon
net0: name=eth0,bridge=vmbr0,firewall=1,hwaddr=56:68:4D:F5:F5:EF,ip=dhcp,ip6=dhcp,type=veth
onboot: 1
ostype: ubuntu
rootfs: local-zfs:subvol-101-disk-0,size=20G
swap: 512
lxc.cgroup2.devices.allow: c 116:* rwm
lxc.mount.entry: /dev/snd dev/snd none bind,optional,create=dir

root@pve:~# pct enter 101
root@roon:~# aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 1: DAC51090980 [ADI-2 DAC (51090980)], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
Click to expand...
Now I have another issue, when I try to play with pianobar, I get the answer "Cannot open audio device".
 
titust11 said:
Now I have another issue, when I try to play with pianobar, I get the answer "Cannot open audio device".
Click to expand...
Try this out:
  • Shutdown container.
  • Backup container.
  • Restore container. (Make sure to restore as privileged.)
  • Startup container.
I'm using Roon... But I always test with the alsa utilities.
 
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