docker-librespot/docker-compose.yml

version: '2.3'

volumes:
  cache:

services:
  librespot:
    build: .
    image: docker.io/fphammerle/librespot
    group_add: [29] # stat --format='%g %n' /dev/snd/*
    command: librespot
      --cache /var/cache/librespot
      --name librespot-docker-compose-test
      --device-type computer
      --verbose
      --backend alsa
      --device surround21
      --enable-volume-normalisation
      --volume-ctrl linear
      --initial-volume 25
    read_only: yes
    volumes:
    - type: volume
      source: cache
      target: /var/cache/librespot # $LIBRESPOT_CACHE_PATH
    devices:
    - /dev/snd
    userns_mode: host
    network_mode: host
    cap_drop: [all]
    security_opt: [no-new-privileges]
    cpus: 0.4
    mem_limit: 32M

# https://docs.docker.com/compose/compose-file/compose-file-v2/