On 09/11/13 15:12, brian mullan wrote:
> I've searched the web for 2 weeks now and can find no documentation
> describing steps to configure "sound" in an LXC container.
>
Here is what I do. It's just ALSA (not Pulseaudio) but I do run a
desktop in a container and it works for me.
1. install alsa-lib alsa-utils in the container
2. enable autodev in the container's LXC config
# Use autodev to be compatible with systemd
lxc.autodev = 1
lxc.hook.autodev = /etc/lxc/myhost/autodev
(set the autodev path to an apprpriate location on your host)
3. write an autodev script on the host at the path in "lxc.hook.autodev"
from step 1. Make it executable.
#!/bin/bash
# LXC Autodev hook. Created by Amylum
cd ${LXC_ROOTFS_MOUNT}
mkdir ./dev/snd
ifs_char=$IFS
IFS=$'\n'
ifs_line=$IFS
for i in $(ls -l /dev/snd | grep '^c' | tr -s ' ' | awk -F "[ ,]"
{'print "mknod -m 660 ./dev/snd/"$11" c "$5" "$7" && chown root:audio
./dev/snd/"$11'})
do
IFS=$ifs_char
eval $i
IFS=$ifs_line
done
4. add devices to lxc config file
# For ALSA Sound
lxc.cgroup.devices.allow = c 116:* rwm # dev/snd/
5. add any users needing to use audio to the "audio" group
for user in ${audio_users}
do
usermod -a -G audio $user
done
Some explanation:
Container cannot use udev to create device nodes and the way systemd
initialises the container's /dev prevents you creating them from the
host. So, you have to use an autodev hook to create the device nodes at
start-up (steps 2 and 3). You also need allow access to the devices in
the container's config and that is what step 4 does.
I ought to get PA working but I haven't had the time or the inclination.
I hope this is of some help.
John
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