Alpine-Coturn

Container for Alpine Linux + Coturn Stun/Turn Server

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This image containerizes the Coturn server to setup a STUN/TURN gateway for VoIP traffic as a micro service.

Based on Alpine Linux from my alpine-s6 image with the s6 init system overlayed in it.

The image is tagged respectively for the following architectures,

• armhf
• armv7l
• aarch64
• x86_64 (retagged as the latest )

non-x86_64 builds have embedded binfmt_misc support and contain the qemu-user-static binary that allows for running it also inside an x86_64 environment that has it.

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Get the Image

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Pull the image for your architecture it's already available from Docker Hub.

# make pull
docker pull woahbase/alpine-coturn:x86_64

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Configuration Defaults

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• Config file loaded from /var/lib/coturn/turnserver.conf edit or remount this with your own. A default is provided which is auto loaded if there aren't any config file to start with.

• Data stored at /var/lib/coturn.

• Default configuration listens to ports 3478 and 5349(TLS), for the latter, you need to update the location where your certs are in the config file.

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Run

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If you want to run images for other architectures, you will need to have binfmt support configured for your machine. multiarch, has made it easy for us containing that into a docker container.

# make regbinfmt
docker run --rm --privileged multiarch/qemu-user-static:register --reset

Without the above, you can still run the image that is made for your architecture, e.g for an x86_64 machine..

This images already has a user alpine configured to drop privileges to the passed PUID/PGID which is ideal if its used to run in non-root mode. That way you only need to specify the values at runtime and pass the -u alpine if need be. (run id in your terminal to see your own PUID/PGID values.)

Running make starts the service.

# make
docker run --rm -it \
  --name docker_coturn --hostname coturn \
  -c 256 -m 256m \
  -e PGID=1000 -e PUID=1000 \
  -p 5349:5349/udp -p 3478:3478/udp \
  -p 5349:5349/tcp -p 3478:3478/tcp \
  -v /etc/hosts:/etc/hosts:ro \
  -v /etc/localtime:/etc/localtime:ro \
  -v data:/var/lib/coturn \
  woahbase/alpine-coturn:x86_64

Stop the container with a timeout, (defaults to 2 seconds)

# make stop
docker stop -t 2 docker_coturn

Removes the container, (always better to stop it first and -f only when needed most)

# make rm
docker rm -f docker_coturn

Restart the container with

# make restart
docker restart docker_coturn

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Shell access

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Get a shell inside a already running container,

# make debug
docker exec -it docker_coturn /bin/bash

set user or login as root,

# make rdebug
docker exec -u root -it docker_coturn /bin/bash

To check logs of a running container in real time

# make logs
docker logs -f docker_coturn

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Development

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If you have the repository access, you can clone and build the image yourself for your own system, and can push after.

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Setup

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Before you clone the repo, you must have Git, GNU make, and Docker setup on the machine.

git clone https://github.com/woahbase/alpine-coturn
cd alpine-coturn

You can always skip installing make but you will have to type the whole docker commands then instead of using the sweet make targets.

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Build

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You need to have binfmt_misc configured in your system to be able to build images for other architectures.

Otherwise to locally build the image for your system. [ARCH defaults to x86_64, need to be explicit when building for other architectures.]

# make ARCH=x86_64 build
# sets up binfmt if not x86_64
docker build --rm --compress --force-rm \
  --no-cache=true --pull \
  -f ./Dockerfile_x86_64 \
  --build-arg DOCKERSRC=woahbase/alpine-s6:x86_64 \
  --build-arg PGID=1000 \
  --build-arg PUID=1000 \
  -t woahbase/alpine-coturn:x86_64 \
  .

To check if its working..

# make ARCH=x86_64 test
docker run --rm -it \
  --name docker_coturn --hostname coturn \
  -e PGID=1000 -e PUID=1000 \
  --entrypoint sh \
  woahbase/alpine-coturn:x86_64 \
  -ec 'turnserver -h;'

And finally, if you have push access,

# make ARCH=x86_64 push
docker push woahbase/alpine-coturn:x86_64

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Maintenance

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Sources at Github. Built at Travis-CI.org (armhf / x64 builds). Images at Docker hub. Metadata at Microbadger.

Maintained by WOAHBase.