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authoranoadragon453 <anoadragon453@users.noreply.github.com>2021-06-03 16:21:02 +0000
committeranoadragon453 <anoadragon453@users.noreply.github.com>2021-06-03 16:21:02 +0000
commit5b98526363a34c5c94d4ede0e8c44d262c085b78 (patch)
treec8e846299a0c82d24bd920a27fdfd147fa8a3a6c /develop/federate.html
parentSet up gh-pages branch (diff)
downloadsynapse-5b98526363a34c5c94d4ede0e8c44d262c085b78.tar.xz
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+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="upgrading/index.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded "><a 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+                        <h1 id="setting-up-federation"><a class="header" href="#setting-up-federation">Setting up federation</a></h1>
+<p>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.</p>
+<p>The <code>server_name</code> configured in the Synapse configuration file (often
+<code>homeserver.yaml</code>) defines how resources (users, rooms, etc.) will be
+identified (eg: <code>@user:example.com</code>, <code>#room:example.com</code>). 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 <code>server_name</code> to match your machine's public DNS hostname.</p>
+<p>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 <a href="reverse_proxy.html">reverse_proxy.md</a> for instructions
+on how to correctly set one up.</p>
+<p>In some cases you might not want to run Synapse on the machine that has
+the <code>server_name</code> 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 <code>@user:example.com</code>, but you want to run
+Synapse on <code>synapse.example.com</code> on port 443. This can be done using
+delegation, which allows an admin to control where federation traffic should
+be sent. See <a href="delegate.html">delegate.md</a> for instructions on how to set this up.</p>
+<p>Once federation has been configured, you should be able to join a room over
+federation. A good place to start is <code>#synapse:matrix.org</code> - a room for
+Synapse admins.</p>
+<h2 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h2>
+<p>You can use the <a href="https://matrix.org/federationtester">federation tester</a>
+to check if your homeserver is configured correctly. Alternatively try the
+<a href="https://matrix.org/federationtester/api/report?server_name=DOMAIN">JSON API used by the federation tester</a>.
+Note that you'll have to modify this URL to replace <code>DOMAIN</code> with your
+<code>server_name</code>. Hitting the API directly provides extra detail.</p>
+<p>The typical failure mode for federation is that when the server tries to join
+a room, it is rejected with &quot;401: Unauthorized&quot;. 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).</p>
+<p>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 <a href="reverse_proxy.html">reverse_proxy.md</a> for instructions on how to correctly
+configure a reverse proxy.</p>
+<h3 id="known-issues"><a class="header" href="#known-issues">Known issues</a></h3>
+<p><strong>HTTP <code>308 Permanent Redirect</code> redirects are not followed</strong>: Due to missing features
+in the HTTP library used by Synapse, 308 redirects are currently not followed by
+federating servers, which can cause <code>M_UNKNOWN</code> or <code>401 Unauthorized</code> errors. This
+may affect users who are redirecting apex-to-www (e.g. <code>example.com</code> -&gt; <code>www.example.com</code>),
+and especially users of the Kubernetes <em>Nginx Ingress</em> module, which uses 308 redirect
+codes by default. For those Kubernetes users, <a href="https://stackoverflow.com/a/52617528/5096871">this Stackoverflow post</a> 
+might be helpful. For other users, switching to a <code>301 Moved Permanently</code> code may be
+an option. 308 redirect codes will be supported properly in a future
+release of Synapse.</p>
+<h2 id="running-a-demo-federation-of-synapses"><a class="header" href="#running-a-demo-federation-of-synapses">Running a demo federation of Synapses</a></h2>
+<p>If you want to get up and running quickly with a trio of homeservers in a
+private federation, there is a script in the <code>demo</code> directory. This is mainly
+useful just for development purposes. See <a href="../demo/README">demo/README</a>.</p>
+
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