What

Two Docker images for Roon Bridge & Roon Server

Image features

multi-architecture:
- linux/amd64
- linux/arm64 (bridge only)
- linux/arm/v7 (bridge only)
- ~~linux/arm/v6~~
hardened:
- image runs read-only
- image runs with no capabilities
- process runs as a non-root user, disabled login, no shell
lightweight
- based on our slim Debian buster version
- simple entrypoint script
- multi-stage build with no installed dependencies for the Bridge runtime image, one dependency for Server:
  - ffmpeg
observable
- healthcheck (server only)
- log to stdout
- ~~prometheus endpoint~~ not applicable

Run

docker run -d \
    --net host \
    --name bridge \
    --read-only \
    --cap-drop ALL \
    --group-add audio \
    --device /dev/snd \
    --rm \
    dubodubonduponey/roon-bridge:v1

docker run -d \
    --net host \
    --name server \
    --read-only \
    --cap-drop ALL \
    --group-add audio \
    --device /dev/snd \
    --rm \
    dubodubonduponey/roon-server:v1

GOTCHA

Debian by default limits inotify watches to 8192, which might turns out to be too little.

You probably want to bump that up to prevent your system from crashing / rebooting...

Typically, on the host:

echo "fs.inotify.max_user_watches = 1048576" > /etc/sysctl.conf
echo 1048576 > /proc/sys/fs/inotify/max_user_watches

Notes

Building your own

# In case you want to download the latest from Roon servers
# ./refresh.sh

Roon packages version

The builder uses the packages stored under cache.

If you want to rebuild with fresh versions, call the ./refresh.sh script first to redownload from Roon servers.

Alpine

This is currently running on Debian, and I have no intention in trying again to make this work on Alpine.

If you do, here are some notes:

I first tried using gcompat. Past a linker name mismatch, mono-gen will just SIGBUS.
I then tried to cross-compile mono (using qemu). This failed as well with some obscure ARM syscall apparently being not implemented in qemu.

At this time, ncopa just enabled armv7 for mono (https://git.alpinelinux.org/aports/tree/testing/mono/APKBUILD): https://pkgs.alpinelinux.org/package/edge/testing/armv7/mono

Whether you can use it as a drop-in replacement for Roon embedded Mono is yet to be determined. Assuming this would work, it's unclear also if gcompat would still be necessary.

Moar?

See DEVELOP.md

daemonp/docker-roon