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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.