mirror of
https://mau.dev/maunium/synapse.git
synced 2024-11-11 12:31:58 +01:00
66 lines
3.5 KiB
Markdown
66 lines
3.5 KiB
Markdown
Setting up federation
|
|
=====================
|
|
|
|
Federation is the process by which users on different servers can participate
|
|
in the same room. For this to work, those other servers must be able to contact
|
|
yours to send messages.
|
|
|
|
The `server_name` configured in the Synapse configuration file (often
|
|
`homeserver.yaml`) defines how resources (users, rooms, etc.) will be
|
|
identified (eg: `@user:example.com`, `#room:example.com`). By default,
|
|
it is also the domain that other servers will use to try to reach your
|
|
server (via port 8448). This is easy to set up and will work provided
|
|
you set the `server_name` to match your machine's public DNS hostname.
|
|
|
|
For this default configuration to work, you will need to listen for TLS
|
|
connections on port 8448. The preferred way to do that is by using a
|
|
reverse proxy: see [reverse_proxy.md](<reverse_proxy.md>) for instructions
|
|
on how to correctly set one up.
|
|
|
|
In some cases you might not want to run Synapse on the machine that has
|
|
the `server_name` as its public DNS hostname, or you might want federation
|
|
traffic to use a different port than 8448. For example, you might want to
|
|
have your user names look like `@user:example.com`, but you want to run
|
|
Synapse on `synapse.example.com` on port 443. This can be done using
|
|
delegation, which allows an admin to control where federation traffic should
|
|
be sent. See [delegate.md](delegate.md) for instructions on how to set this up.
|
|
|
|
Once federation has been configured, you should be able to join a room over
|
|
federation. A good place to start is `#synapse:matrix.org` - a room for
|
|
Synapse admins.
|
|
|
|
## Troubleshooting
|
|
|
|
You can use the [federation tester](https://matrix.org/federationtester)
|
|
to check if your homeserver is configured correctly. Alternatively try the
|
|
[JSON API used by the federation tester](https://matrix.org/federationtester/api/report?server_name=DOMAIN).
|
|
Note that you'll have to modify this URL to replace `DOMAIN` with your
|
|
`server_name`. Hitting the API directly provides extra detail.
|
|
|
|
The typical failure mode for federation is that when the server tries to join
|
|
a room, it is rejected with "401: Unauthorized". Generally this means that other
|
|
servers in the room could not access yours. (Joining a room over federation is
|
|
a complicated dance which requires connections in both directions).
|
|
|
|
Another common problem is that people on other servers can't join rooms that
|
|
you invite them to. This can be caused by an incorrectly-configured reverse
|
|
proxy: see [reverse_proxy.md](<reverse_proxy.md>) for instructions on how to correctly
|
|
configure a reverse proxy.
|
|
|
|
### Known issues
|
|
|
|
**HTTP `308 Permanent Redirect` redirects are not followed**: Due to missing features
|
|
in the HTTP library used by Synapse, 308 redirects are currently not followed by
|
|
federating servers, which can cause `M_UNKNOWN` or `401 Unauthorized` errors. This
|
|
may affect users who are redirecting apex-to-www (e.g. `example.com` -> `www.example.com`),
|
|
and especially users of the Kubernetes *Nginx Ingress* module, which uses 308 redirect
|
|
codes by default. For those Kubernetes users, [this Stackoverflow post](https://stackoverflow.com/a/52617528/5096871)
|
|
might be helpful. For other users, switching to a `301 Moved Permanently` code may be
|
|
an option. 308 redirect codes will be supported properly in a future
|
|
release of Synapse.
|
|
|
|
## Running a demo federation of Synapses
|
|
|
|
If you want to get up and running quickly with a trio of homeservers in a
|
|
private federation, there is a script in the `demo` directory. This is mainly
|
|
useful just for development purposes. See [demo/README](<../demo/README>).
|