instrumentisto / Coturn Docker Image
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Coturn TURN server Docker image
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What is Coturn TURN server?
The TURN Server is a VoIP media traffic NAT traversal server and gateway. It can be used as a general-purpose network traffic TURN server and gateway, too.
How to use this image
To run Coturn TURN server just start the container:
docker run -d -p 3478:3478 -p 49152-65535:49152-65535/udp instrumentisto/coturn
Why so many ports opened?
As per RFC 5766 Section 6.2, these are the ports that the TURN server will use to exchange media.
You can change them with min-port and max-port Coturn configuration options:
docker run -d -p 3478:3478 -p 49160-49200:49160-49200/udp \
instrumentisto/coturn -n --log-file=stdout \
--external-ip='$(detect-external-ip)' \
--min-port=49160 --max-port=49200
Or just use the host network directly (recommended, as Docker performs badly with large port ranges):
docker run -d --network=host instrumentisto/coturn
Configuration
By default, default Coturn configuration and CLI options provided in CMD Dockerfile instruction are used.
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You may either specify your own configuration file instead.
docker run -d --network=host \ -v $(pwd)/my.conf:/etc/coturn/turnserver.conf \ instrumentisto/coturn
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Or specify command line options directly.
docker run -d --network=host instrumentisto/coturn \ -n --log-file=stdout \ --min-port=49160 --max-port=49200 \ --lt-cred-mech --fingerprint \ --no-multicast-peers --no-cli \ --no-tlsv1 --no-tlsv1_1 \ --realm=my.realm.org \
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Or even specify another configuration file.
docker run -d --network=host \ -v $(pwd)/my.conf:/my/coturn.conf \ instrumentisto/coturn -c /my/coturn.conf
Automatic detection of external IP
detect-external-ip binary may be used to automatically detect external IP of TURN server in runtime. It's okay to use it multiple times (the value will be evaluated only once).
docker run -d --network=host instrumentisto/coturn \
-n --log-file=stdout \
--external-ip='$(detect-external-ip)' \
--relay-ip='$(detect-external-ip)'
Persistence
By default, Coturn Docker image persists its data in /var/lib/coturn directory.
You can speedup Coturn simply by using tmpfs for that:
docker run -d --network=host --mount type=tmpfs,destination=/var/lib/coturn \
instrumentisto/coturn
Image versions
This image is based on the popular Alpine Linux project, available in the alpine official image. Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.
This variant is highly recommended when final image size being as small as possible is desired. The main caveat to note is that it does use musl libc instead of glibc and friends, so certain software might run into issues depending on the depth of their libc requirements. However, most software doesn't have an issue with this, so this variant is usually a very safe choice. See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.
X
Latest version of X Coturn major version.
X.Y
Latest version of X.Y Coturn minor version.
X.Y.Z or X.Y.Z.W
Concrete X.Y.Z or X.Y.Z.W version of Coturn.
License
Coturn is licensed under this license.
As with all Docker images, these likely also contain other software which may be under other licenses (such as Bash, etc from the base distribution, along with any direct or indirect dependencies of the primary software being contained).
As for any pre-built image usage, it is the image user's responsibility to ensure that any use of this image complies with any relevant licenses for all software contained within.
The sources for producing instrumentisto/coturn Docker images are licensed under Blue Oak Model License 1.0.0.
Issues
We can't notice comments in the DockerHub so don't use them for reporting issue or asking question.
If you have any problems with or questions about this image, please contact us through a GitHub issue.