I am using host Ubuntu 16.0.4 system to run my lxc container. I uninstalled pulseaudio as I wanted to use ALSA directly.
After uninstalling pulseaudio from the host machine, I was able to play sounds using the command like one below(on host machine): aplay /usr/share/sounds/alsa/Rear_Right.wav Inside the lxc container, I have installed alsa libs and alsa utils. When I use the same command as above inside the container, I get the following errors: ALSA lib confmisc.c:768:(parse_card) cannot find card '0' ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:4727:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default aplay: main:654: audio open error: No such file or directory The sound devices inside container are: bash-4.2# ls -al /dev/snd/* crw-rw---- 1 root 29 116, 5 Nov 1 17:21 /dev/snd/controlC0 crw-rw---- 1 root 29 116, 2 Nov 1 17:21 /dev/snd/controlC1 crw-rw---- 1 root 29 116, 10 Nov 1 17:21 /dev/snd/controlC2 crw-rw---- 1 root 29 116, 9 Nov 1 17:21 /dev/snd/hwC0D0 crw-rw---- 1 root 29 116, 13 Nov 1 17:21 /dev/snd/hwC2D0 crw-rw---- 1 root 29 116, 6 Nov 1 17:21 /dev/snd/pcmC0D3p crw-rw---- 1 root 29 116, 7 Nov 1 17:21 /dev/snd/pcmC0D7p crw-rw---- 1 root 29 116, 8 Nov 1 17:21 /dev/snd/pcmC0D8p crw-rw---- 1 root 29 116, 4 Nov 1 17:21 /dev/snd/pcmC1D0c crw-rw---- 1 root 29 116, 3 Nov 1 17:27 /dev/snd/pcmC1D0p crw-rw---- 1 root 29 116, 11 Nov 1 17:21 /dev/snd/pcmC2D3p crw-rw---- 1 root 29 116, 12 Nov 1 17:21 /dev/snd/pcmC2D7p crw-rw---- 1 root 29 116, 1 Nov 1 17:21 /dev/snd/seq crw-rw---- 1 root 29 116, 33 Nov 1 17:21 /dev/snd/timer /dev/snd/by-id: total 0 drwxr-xr-x 2 root root 60 Nov 1 17:21 . drwxr-xr-x 4 root root 360 Nov 1 17:21 .. lrwxrwxrwx 1 root root 12 Nov 1 17:21 usb-126c_4.1_amplifier-00 -> ../controlC1 /dev/snd/by-path: total 0 drwxr-xr-x 2 root root 100 Nov 1 17:21 . drwxr-xr-x 4 root root 360 Nov 1 17:21 .. lrwxrwxrwx 1 root root 12 Nov 1 17:21 pci-0000:00:03.0 -> ../controlC0 lrwxrwxrwx 1 root root 12 Nov 1 17:21 pci-0000:00:14.0-usb-0:5:1.0 -> ../controlC1 lrwxrwxrwx 1 root root 12 Nov 1 17:21 pci-0000:01:00.1 -> ../controlC2
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