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README.md

Synapse Docker

This Docker image will run Synapse as a single process. It does not provide a database server or a TURN server, you should run these separately.

Run

We do not currently offer a latest image, as this has somewhat undefined semantics. We instead release only tagged versions so upgrading between releases is entirely within your control.

Using docker-compose (easier)

This image is designed to run either with an automatically generated configuration file or with a custom configuration that requires manual editing.

An easy way to make use of this image is via docker-compose. See the contrib/docker section of the synapse project for examples.

Without Compose (harder)

If you do not wish to use Compose, you may still run this image using plain Docker commands. Note that the following is just a guideline and you may need to add parameters to the docker run command to account for the network situation with your postgres database.

docker run \
    -d \
    --name synapse \
    -v ${DATA_PATH}:/data \
    -e SYNAPSE_SERVER_NAME=my.matrix.host \
    -e SYNAPSE_REPORT_STATS=yes \
    docker.io/matrixdotorg/synapse:latest

Volumes

The image expects a single volume, located at /data, that will hold:

  • temporary files during uploads;
  • uploaded media and thumbnails;
  • the SQLite database if you do not configure postgres;
  • the appservices configuration.

You are free to use separate volumes depending on storage endpoints at your disposal. For instance, /data/media coud be stored on a large but low performance hdd storage while other files could be stored on high performance endpoints.

In order to setup an application service, simply create an appservices directory in the data volume and write the application service Yaml configuration file there. Multiple application services are supported.

Environment

Unless you specify a custom path for the configuration file, a very generic file will be generated, based on the following environment settings. These are a good starting point for setting up your own deployment.

Global settings:

  • UID, the user id Synapse will run as [default 991]
  • GID, the group id Synapse will run as [default 991]
  • SYNAPSE_CONFIG_PATH, path to a custom config file

If SYNAPSE_CONFIG_PATH is set, you should generate a configuration file then customize it manually. No other environment variable is required.

Otherwise, a dynamic configuration file will be used. The following environment variables are available for configuration:

  • SYNAPSE_SERVER_NAME (mandatory), the current server public hostname.
  • SYNAPSE_REPORT_STATS, (mandatory, yes or no), enable anonymous statistics reporting back to the Matrix project which helps us to get funding.
  • SYNAPSE_NO_TLS, set this variable to disable TLS in Synapse (use this if you run your own TLS-capable reverse proxy).
  • SYNAPSE_ENABLE_REGISTRATION, set this variable to enable registration on the Synapse instance.
  • SYNAPSE_ALLOW_GUEST, set this variable to allow guest joining this server.
  • SYNAPSE_EVENT_CACHE_SIZE, the event cache size [default 10K].
  • SYNAPSE_CACHE_FACTOR, the cache factor [default 0.5].
  • SYNAPSE_RECAPTCHA_PUBLIC_KEY, set this variable to the recaptcha public key in order to enable recaptcha upon registration.
  • SYNAPSE_RECAPTCHA_PRIVATE_KEY, set this variable to the recaptcha private key in order to enable recaptcha upon registration.
  • SYNAPSE_TURN_URIS, set this variable to the coma-separated list of TURN uris to enable TURN for this homeserver.
  • SYNAPSE_TURN_SECRET, set this to the TURN shared secret if required.
  • SYNAPSE_MAX_UPLOAD_SIZE, set this variable to change the max upload size [default 10M].

Shared secrets, that will be initialized to random values if not set:

  • SYNAPSE_REGISTRATION_SHARED_SECRET, secret for registrering users if registration is disable.
  • SYNAPSE_MACAROON_SECRET_KEY secret for signing access tokens to the server.

Database specific values (will use SQLite if not set):

  • POSTGRES_DB - The database name for the synapse postgres database. [default: synapse]
  • POSTGRES_HOST - The host of the postgres database if you wish to use postgresql instead of sqlite3. [default: db which is useful when using a container on the same docker network in a compose file where the postgres service is called db]
  • POSTGRES_PASSWORD - The password for the synapse postgres database. If this is set then postgres will be used instead of sqlite3. [default: none] NOTE: You are highly encouraged to use postgresql! Please use the compose file to make it easier to deploy.
  • POSTGRES_USER - The user for the synapse postgres database. [default: matrix]

Mail server specific values (will not send emails if not set):

  • SYNAPSE_SMTP_HOST, hostname to the mail server.
  • SYNAPSE_SMTP_PORT, TCP port for accessing the mail server [default 25].
  • SYNAPSE_SMTP_USER, username for authenticating against the mail server if any.
  • SYNAPSE_SMTP_PASSWORD, password for authenticating against the mail server if any.

Build

Build the docker image with the docker build command from the root of the synapse repository.

docker build -t docker.io/matrixdotorg/synapse . -f docker/Dockerfile

The -t option sets the image tag. Official images are tagged matrixdotorg/synapse:<version> where <version> is the same as the release tag in the synapse git repository.

You may have a local Python wheel cache available, in which case copy the relevant packages in the cache/ directory at the root of the project.