How to setup localhost Cotrun server for offline development?

Question

I am building a WebRTC project that needs a Coturn server. I am struggling to setup a localhost version to use for development. Please do not suggest using a third party TURN server. I have been using them to this point and have had inconsistent connection and latency issues so now intend to host one.

The project is using docker . The coturn image I am using is https://github.com/kevzettler/coturnDockerLongTermCredentials

I am trying to manually docker run the container and get it working.

docker run \\ --name turnserver \\ --net=host \\ -e "TURN_PORT_START=49152" \\ -e "TURN_PORT_END=65535" \\ -e "TURN_REALM=projectName" \\ -d \\ -t \\ meetrix/coturn-long-term-cred

To test connections to the turn server I am using https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/ and pointing it to turn:0.0.0.0

I am able to do this on a production hosting machine and connect successfully using the trickle-ice page. localhost however, is failing.

I want to get a local Coturn setup so I can dev offline. The primary issue I believe is around open PORTS.

Coturn expects a large range of ports open 49152-65535 . If we update the docker command to explicitly expose these ports like:

docker run \\ --name turnserver \\ -p 3478:3478/udp \\ -p 3478:3478 \\ -p 49152-65535:49152-65535/udp \\ -e "TURN_PORT_START=49152" \\ -e "TURN_PORT_END=65535" \\ -e "TURN_REALM=projectname" \\ -d \\ -t \\ meetrix/coturn-long-term-cred

The docker daemon will crash.

This is why the initial run command, and production uses --net=host . --net=host will use the host machines firewall instead of dockers .

The host machine for this local dev environment is a macOS Sierra. I suspect the ports are not open at the macOS level in the --net=host scenario.