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< h1 id = "delegation" > < a class = "header" href = "#delegation" > Delegation< / a > < / h1 >
< p > By default, other homeservers will expect to be able to reach yours via
your < code > server_name< / code > , on port 8448. For example, if you set your < code > server_name< / code >
to < code > example.com< / code > (so that your user names look like < code > @user:example.com< / code > ),
other servers will try to connect to yours at < code > https://example.com:8448/< / code > .< / p >
< p > Delegation is a Matrix feature allowing a homeserver admin to retain a
< code > server_name< / code > of < code > example.com< / code > so that user IDs, room aliases, etc continue
to look like < code > *:example.com< / code > , whilst having federation traffic routed
to a different server and/or port (e.g. < code > synapse.example.com:443< / code > ).< / p >
< h2 id = "well-known-delegation" > < a class = "header" href = "#well-known-delegation" > .well-known delegation< / a > < / h2 >
< p > To use this method, you need to be able to alter the
< code > server_name< / code > 's https server to serve the < code > /.well-known/matrix/server< / code >
URL. Having an active server (with a valid TLS certificate) serving your
< code > server_name< / code > domain is out of the scope of this documentation.< / p >
< p > The URL < code > https://< server_name> /.well-known/matrix/server< / code > should
return a JSON structure containing the key < code > m.server< / code > like so:< / p >
< pre > < code class = "language-json" > {
" m.server" : " < synapse.server.name> [:< yourport> ]"
}
< / code > < / pre >
< p > In our example, this would mean that URL < code > https://example.com/.well-known/matrix/server< / code >
should return:< / p >
< pre > < code class = "language-json" > {
" m.server" : " synapse.example.com:443"
}
< / code > < / pre >
< p > Note, specifying a port is optional. If no port is specified, then it defaults
to 8448.< / p >
< p > With .well-known delegation, federating servers will check for a valid TLS
certificate for the delegated hostname (in our example: < code > synapse.example.com< / code > ).< / p >
< h2 id = "srv-dns-record-delegation" > < a class = "header" href = "#srv-dns-record-delegation" > SRV DNS record delegation< / a > < / h2 >
< p > It is also possible to do delegation using a SRV DNS record. However, that is
considered an advanced topic since it's a bit complex to set up, and < code > .well-known< / code >
delegation is already enough in most cases.< / p >
< p > However, if you really need it, you can find some documentation on how such a
record should look like and how Synapse will use it in < a href = "https://matrix.org/docs/spec/server_server/latest#resolving-server-names" > the Matrix
specification< / a > .< / p >
< h2 id = "delegation-faq" > < a class = "header" href = "#delegation-faq" > Delegation FAQ< / a > < / h2 >
< h3 id = "when-do-i-need-delegation" > < a class = "header" href = "#when-do-i-need-delegation" > When do I need delegation?< / a > < / h3 >
< p > If your homeserver's APIs are accessible on the default federation port (8448)
and the domain your < code > server_name< / code > points to, you do not need any delegation.< / p >
< p > For instance, if you registered < code > example.com< / code > and pointed its DNS A record at a
fresh server, you could install Synapse on that host, giving it a < code > server_name< / code >
of < code > example.com< / code > , and once a reverse proxy has been set up to proxy all requests
sent to the port < code > 8448< / code > and serve TLS certificates for < code > example.com< / code > , you
wouldn't need any delegation set up.< / p >
< p > < strong > However< / strong > , if your homeserver's APIs aren't accessible on port 8448 and on the
domain < code > server_name< / code > points to, you will need to let other servers know how to
find it using delegation.< / p >
< h3 id = "do-you-still-recommend-against-using-a-reverse-proxy-on-the-federation-port" > < a class = "header" href = "#do-you-still-recommend-against-using-a-reverse-proxy-on-the-federation-port" > Do you still recommend against using a reverse proxy on the federation port?< / a > < / h3 >
< p > We no longer actively recommend against using a reverse proxy. Many admins will
find it easier to direct federation traffic to a reverse proxy and manage their
own TLS certificates, and this is a supported configuration.< / p >
< p > See < a href = "reverse_proxy.html" > the reverse proxy documentation< / a > for information on setting up a
reverse proxy.< / p >
< h3 id = "do-i-still-need-to-give-my-tls-certificates-to-synapse-if-i-am-using-a-reverse-proxy" > < a class = "header" href = "#do-i-still-need-to-give-my-tls-certificates-to-synapse-if-i-am-using-a-reverse-proxy" > Do I still need to give my TLS certificates to Synapse if I am using a reverse proxy?< / a > < / h3 >
< p > This is no longer necessary. If you are using a reverse proxy for all of your
TLS traffic, then you can set < code > no_tls: True< / code > in the Synapse config.< / p >
< p > In that case, the only reason Synapse needs the certificate is to populate a legacy
< code > tls_fingerprints< / code > field in the federation API. This is ignored by Synapse 0.99.0
and later, and the only time pre-0.99 Synapses will check it is when attempting to
fetch the server keys - and generally this is delegated via < code > matrix.org< / code > , which
is running a modern version of Synapse.< / p >
< h3 id = "do-i-need-the-same-certificate-for-the-client-and-federation-port" > < a class = "header" href = "#do-i-need-the-same-certificate-for-the-client-and-federation-port" > Do I need the same certificate for the client and federation port?< / a > < / h3 >
< p > No. There is nothing stopping you from using different certificates,
particularly if you are using a reverse proxy.< / p >
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