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example-alsa-user-mode.md

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Alsa output in user mode

Using environment variables

Is it now possible to require squeezelite-docker to run squeezelite as a specific user. However, it is important to specify the AUDIO_GID variable to the audio group. For one of my system, this gid is 995. See here for more information on how to retrieve this group id.
Here is the docker-compose file for my gustard x12 DAC, provided as an example:

---
version: "3"

services:
  squeezelite-x12:
    image: giof71/squeezelite
    container_name: squeezelite-x12
    devices:
      - /dev/snd:/dev/snd
    environment:
      - USER_MODE=Y
      - PUID=1000
      - PGID=1000
      - AUDIO_GID=995
      - PRESET=gustard-x12,archimago-goldilocks,rates_up_to_384k
      - SQUEEZELITE_NAME=gustard-x12-usb
      - SQUEEZELITE_SERVER_PORT=lms.homelab.local

Using docker user mode

You can also require docker to run the container in user mode: you will need to specify user in the compose file.
As mentioned before, you will need to specify the appropriate gid otherwise you won't get audio working.
See the following example:

---
version: "3"

services:
  squeezelite-x12:
    image: giof71/squeezelite
    container_name: squeezelite-x12
    devices:
      - /dev/snd:/dev/snd
    user: 1000:995
    environment:
      - PRESET=gustard-x12,archimago-goldilocks,rates_up_to_384k
      - SQUEEZELITE_NAME=gustard-x12-usb
      - SQUEEZELITE_SERVER_PORT=lms.homelab.local

As a sidenote, the container will show a warning:

squeezelite-x12  | Failed to create secure directory (//.config/pulse): No such file or directory

which seems to be harmless.

Retrieve the audio group id

You can retrieve the group id associated to the audio group with the following command:

getent group audio

On my system, this commands outputs:

audio:x:995:brltty,mpd,squeezelite

So 995 in my case is the value to be used for the AUDIO_GID variable or for the group id in the user line of the docker-compose file.