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# Synapse Docker
This Docker image will run Synapse as a single process. By default it uses a
sqlite database; for production use you should connect it to a separate
postgres database.
The image also does *not* provide a TURN server.
## Run
### 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](../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 ${DATA_PATH}:/data \
-e SYNAPSE_SERVER_NAME=my.matrix.host \
-e SYNAPSE_REPORT_STATS=yes \
matrixdotorg/synapse:latest
```
## Volumes
The image expects a single volume, located at ``/data``, that will hold:
* temporary files during uploads;
* uploaded media and thumbnails;
* the SQLite database if you do not configure postgres;
* the appservices configuration.
You are free to use separate volumes depending on storage endpoints at your
disposal. For instance, ``/data/media`` coud be stored on a large but low
performance hdd storage while other files could be stored on high performance
endpoints.
In order to setup an application service, simply create an ``appservices``
directory in the data volume and write the application service Yaml
configuration file there. Multiple application services are supported.
## TLS certificates
Synapse requires a valid TLS certificate. You can do one of the following:
* Provide your own certificate and key (as
`${DATA_PATH}/${SYNAPSE_SERVER_NAME}.crt` and
`${DATA_PATH}/${SYNAPSE_SERVER_NAME}.key`, or elsewhere by providing an
entire config as `${SYNAPSE_CONFIG_PATH}`).
* Use a reverse proxy to terminate incoming TLS, and forward the plain http
traffic to port 8008 in the container. In this case you should set `-e
SYNAPSE_NO_TLS=1`.
* Use the ACME (Let's Encrypt) support built into Synapse. This requires
`${SYNAPSE_SERVER_NAME}` port 80 to be forwarded to port 8009 in the
container, for example with `-p 80:8009`. To enable it in the docker
container, set `-e SYNAPSE_ACME=1`.
If you don't do any of these, Synapse will fail to start with an error similar to:
synapse.config._base.ConfigError: Error accessing file '/data/<server_name>.tls.crt' (config for tls_certificate): No such file or directory
## 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 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_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`].
* ``SYNAPSE_ACME``: set this to enable the ACME certificate renewal support.
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.
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