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<!-- END CUSTOM SYNAPSE MODIFICATIONS -->
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<h1 class="menu-title">Synapse</h1>
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</a>
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<a href="https://github.com/element-hq/synapse/edit/develop/docs/usage/administration/admin_faq.md" title="Suggest an edit" aria-label="Suggest an edit" rel="edit">
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</form>
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</ul>
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</div>
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</div>
|
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<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
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<script>
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document.getElementById('mdbook-sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
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document.getElementById('mdbook-sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
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Array.from(document.querySelectorAll('#mdbook-sidebar a')).forEach(function(link) {
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link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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});
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</script>
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<div id="mdbook-content" class="content">
|
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<main>
|
||
<h2 id="admin-faq"><a class="header" href="#admin-faq">Admin FAQ</a></h2>
|
||
<h2 id="how-do-i-become-a-server-admin"><a class="header" href="#how-do-i-become-a-server-admin">How do I become a server admin?</a></h2>
|
||
<p>If your server already has an admin account you should use the
|
||
<a href="../../admin_api/user_admin_api.html#change-whether-a-user-is-a-server-administrator-or-not">User Admin API</a>
|
||
to promote other accounts to become admins.</p>
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||
<p>If you don’t have any admin accounts yet you won’t be able to use the admin API,
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||
so you’ll have to edit the database manually. Manually editing the database is
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||
generally not recommended so once you have an admin account: use the admin APIs
|
||
to make further changes.</p>
|
||
<pre><code class="language-sql">UPDATE users SET admin = 1 WHERE name = '@foo:bar.com';
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</code></pre>
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||
<h2 id="what-servers-are-my-server-talking-to"><a class="header" href="#what-servers-are-my-server-talking-to">What servers are my server talking to?</a></h2>
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||
<p>Run this sql query on your db:</p>
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||
<pre><code class="language-sql">SELECT * FROM destinations;
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</code></pre>
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<h2 id="what-servers-are-currently-participating-in-this-room"><a class="header" href="#what-servers-are-currently-participating-in-this-room">What servers are currently participating in this room?</a></h2>
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<p>Run this sql query on your db:</p>
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<pre><code class="language-sql">SELECT DISTINCT split_part(state_key, ':', 2)
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FROM current_state_events
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WHERE room_id = '!cURbafjkfsMDVwdRDQ:matrix.org' AND membership = 'join';
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</code></pre>
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<h2 id="what-users-are-registered-on-my-server"><a class="header" href="#what-users-are-registered-on-my-server">What users are registered on my server?</a></h2>
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<pre><code class="language-sql">SELECT NAME from users;
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</code></pre>
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<h2 id="how-can-i-export-user-data"><a class="header" href="#how-can-i-export-user-data">How can I export user data?</a></h2>
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<p>Synapse includes a Python command to export data for a specific user. It takes the homeserver
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configuration file and the full Matrix ID of the user to export:</p>
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<pre><code class="language-console">python -m synapse.app.admin_cmd -c <config_file> export-data <user_id> --output-directory <directory_path>
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</code></pre>
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<p>If you uses <a href="../../development/dependencies.html#managing-dependencies-with-poetry">Poetry</a>
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||
to run Synapse:</p>
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<pre><code class="language-console">poetry run python -m synapse.app.admin_cmd -c <config_file> export-data <user_id> --output-directory <directory_path>
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</code></pre>
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<p>The directory to store the export data in can be customised with the
|
||
<code>--output-directory</code> parameter; ensure that the provided directory is
|
||
empty. If this parameter is not provided, Synapse defaults to creating
|
||
a temporary directory (which starts with “synapse-exfiltrate”) in <code>/tmp</code>,
|
||
<code>/var/tmp</code>, or <code>/usr/tmp</code>, in that order.</p>
|
||
<p>The exported data has the following layout:</p>
|
||
<pre><code>output-directory
|
||
├───rooms
|
||
│ └───<room_id>
|
||
│ ├───events
|
||
│ ├───state
|
||
│ ├───invite_state
|
||
│ └───knock_state
|
||
├───user_data
|
||
│ ├───account_data
|
||
│ │ ├───global
|
||
│ │ └───<room_id>
|
||
│ ├───connections
|
||
│ ├───devices
|
||
│ └───profile
|
||
└───media_ids
|
||
└───<media_id>
|
||
</code></pre>
|
||
<p>The <code>media_ids</code> folder contains only the metadata of the media uploaded by the user.
|
||
It does not contain the media itself.
|
||
Furthermore, only the <code>media_ids</code> that Synapse manages itself are exported.
|
||
If another media repository (e.g. <a href="https://github.com/turt2live/matrix-media-repo">matrix-media-repo</a>)
|
||
is used, the data must be exported separately.</p>
|
||
<p>With the <code>media_ids</code> the media files can be downloaded.
|
||
Media that have been sent in encrypted rooms are only retrieved in encrypted form.
|
||
The following script can help with download the media files:</p>
|
||
<pre><code class="language-bash">#!/usr/bin/env bash
|
||
|
||
# Parameters
|
||
#
|
||
# source_directory: Directory which contains the export with the media_ids.
|
||
# target_directory: Directory into which all files are to be downloaded.
|
||
# repository_url: Address of the media repository resp. media worker.
|
||
# serverName: Name of the server (`server_name` from homeserver.yaml).
|
||
#
|
||
# Example:
|
||
# ./download_media.sh /tmp/export_data/media_ids/ /tmp/export_data/media_files/ http://localhost:8008 matrix.example.com
|
||
|
||
source_directory=$1
|
||
target_directory=$2
|
||
repository_url=$3
|
||
serverName=$4
|
||
|
||
mkdir -p $target_directory
|
||
|
||
for file in $source_directory/*; do
|
||
filename=$(basename ${file})
|
||
url=$repository_url/_matrix/media/v3/download/$serverName/$filename
|
||
echo "Downloading $filename - $url"
|
||
if ! wget -o /dev/null -P $target_directory $url; then
|
||
echo "Could not download $filename"
|
||
fi
|
||
done
|
||
</code></pre>
|
||
<h2 id="how-do-i-upgrade-from-a-very-old-version-of-synapse-to-the-latest"><a class="header" href="#how-do-i-upgrade-from-a-very-old-version-of-synapse-to-the-latest">How do I upgrade from a very old version of Synapse to the latest?</a></h2>
|
||
<p>See <a href="../../upgrade.html#upgrading-from-a-very-old-version">this</a> section in the
|
||
upgrade docs.</p>
|
||
<h2 id="manually-resetting-passwords"><a class="header" href="#manually-resetting-passwords">Manually resetting passwords</a></h2>
|
||
<p>Users can reset their password through their client. Alternatively, a server admin
|
||
can reset a user’s password using the <a href="../../admin_api/user_admin_api.html#reset-password">admin API</a>.</p>
|
||
<h2 id="i-have-a-problem-with-my-server-can-i-just-delete-my-database-and-start-again"><a class="header" href="#i-have-a-problem-with-my-server-can-i-just-delete-my-database-and-start-again">I have a problem with my server. Can I just delete my database and start again?</a></h2>
|
||
<p>Deleting your database is unlikely to make anything better.</p>
|
||
<p>It’s easy to make the mistake of thinking that you can start again from a clean
|
||
slate by dropping your database, but things don’t work like that in a federated
|
||
network: lots of other servers have information about your server.</p>
|
||
<p>For example: other servers might think that you are in a room, your server will
|
||
think that you are not, and you’ll probably be unable to interact with that room
|
||
in a sensible way ever again.</p>
|
||
<p>In general, there are better solutions to any problem than dropping the database.
|
||
Come and seek help in https://matrix.to/#/#synapse:matrix.org.</p>
|
||
<p>There are two exceptions when it might be sensible to delete your database and start again:</p>
|
||
<ul>
|
||
<li>You have <em>never</em> joined any rooms which are federated with other servers. For
|
||
instance, a local deployment which the outside world can’t talk to.</li>
|
||
<li>You are changing the <code>server_name</code> in the homeserver configuration. In effect
|
||
this makes your server a completely new one from the point of view of the network,
|
||
so in this case it makes sense to start with a clean database.
|
||
(In both cases you probably also want to clear out the media_store.)</li>
|
||
</ul>
|
||
<h2 id="ive-stuffed-up-access-to-my-room-how-can-i-delete-it-to-free-up-the-alias"><a class="header" href="#ive-stuffed-up-access-to-my-room-how-can-i-delete-it-to-free-up-the-alias">I’ve stuffed up access to my room, how can I delete it to free up the alias?</a></h2>
|
||
<p>Using the following curl command:</p>
|
||
<pre><code class="language-console">curl -H 'Authorization: Bearer <access-token>' -X DELETE https://matrix.org/_matrix/client/r0/directory/room/<room-alias>
|
||
</code></pre>
|
||
<p><code><access-token></code> - can be obtained in element by looking in All settings, clicking Help & About and down the bottom is:
|
||
Access Token:<click to reveal></p>
|
||
<p><code><room-alias></code> - the room alias, eg. #my_room:matrix.org this possibly needs to be URL encoded also, for example %23my_room%3Amatrix.org</p>
|
||
<h2 id="how-can-i-find-the-lines-corresponding-to-a-given-http-request-in-my-homeserver-log"><a class="header" href="#how-can-i-find-the-lines-corresponding-to-a-given-http-request-in-my-homeserver-log">How can I find the lines corresponding to a given HTTP request in my homeserver log?</a></h2>
|
||
<p>Synapse tags each log line according to the HTTP request it is processing. When
|
||
it finishes processing each request, it logs a line containing the words
|
||
<code>Processed request: </code>. For example:</p>
|
||
<pre><code>2019-02-14 22:35:08,196 - synapse.access.http.8008 - 302 - INFO - GET-37 - ::1 - 8008 - {@richvdh:localhost} Processed request: 0.173sec/0.001sec (0.002sec, 0.000sec) (0.027sec/0.026sec/2) 687B 200 "GET /_matrix/client/r0/sync HTTP/1.1" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36" [0 dbevts]"
|
||
</code></pre>
|
||
<p>Here we can see that the request has been tagged with <code>GET-37</code>. (The tag depends
|
||
on the method of the HTTP request, so might start with <code>GET-</code>, <code>PUT-</code>, <code>POST-</code>,
|
||
<code>OPTIONS-</code> or <code>DELETE-</code>.) So to find all lines corresponding to this request, we can do:</p>
|
||
<pre><code class="language-console">grep 'GET-37' homeserver.log
|
||
</code></pre>
|
||
<p>If you want to paste that output into a github issue or matrix room, please
|
||
remember to surround it with triple-backticks (```) to make it legible
|
||
(see <a href="https://help.github.com/en/articles/basic-writing-and-formatting-syntax#quoting-code">quoting code</a>).</p>
|
||
<h2 id="what-do-all-those-fields-in-the-processed-line-mean"><a class="header" href="#what-do-all-those-fields-in-the-processed-line-mean">What do all those fields in the ‘Processed’ line mean?</a></h2>
|
||
<p>See <a href="request_log.html">Request log format</a>.</p>
|
||
<h2 id="what-are-the-biggest-rooms-on-my-server"><a class="header" href="#what-are-the-biggest-rooms-on-my-server">What are the biggest rooms on my server?</a></h2>
|
||
<pre><code class="language-sql">SELECT s.canonical_alias, g.room_id, count(*) AS num_rows
|
||
FROM
|
||
state_groups_state AS g,
|
||
room_stats_state AS s
|
||
WHERE g.room_id = s.room_id
|
||
GROUP BY s.canonical_alias, g.room_id
|
||
ORDER BY num_rows desc
|
||
LIMIT 10;
|
||
</code></pre>
|
||
<p>You can also use the <a href="../../admin_api/rooms.html#list-room-api">List Room API</a>
|
||
and <code>order_by</code> <code>state_events</code>.</p>
|
||
<h2 id="people-cant-accept-room-invitations-from-me"><a class="header" href="#people-cant-accept-room-invitations-from-me">People can’t accept room invitations from me</a></h2>
|
||
<p>The typical failure mode here is that you send an invitation to someone
|
||
to join a room or direct chat, but when they go to accept it, they get an
|
||
error (typically along the lines of “Invalid signature”). They might see
|
||
something like the following in their logs:</p>
|
||
<pre><code>2019-09-11 19:32:04,271 - synapse.federation.transport.server - 288 - WARNING - GET-11752 - authenticate_request failed: 401: Invalid signature for server <server> with key ed25519:a_EqML: Unable to verify signature for <server>
|
||
</code></pre>
|
||
<p>This is normally caused by a misconfiguration in your reverse-proxy. See <a href="../../reverse_proxy.html">the reverse proxy docs</a> and double-check that your settings are correct.</p>
|
||
<h2 id="help-synapse-is-slow-and-eats-all-my-ramcpu"><a class="header" href="#help-synapse-is-slow-and-eats-all-my-ramcpu">Help!! Synapse is slow and eats all my RAM/CPU!</a></h2>
|
||
<p>First, ensure you are running the latest version of Synapse, using Python 3
|
||
with a <a href="../../postgres.html">PostgreSQL database</a>.</p>
|
||
<p>Synapse’s architecture is quite RAM hungry currently - we deliberately
|
||
cache a lot of recent room data and metadata in RAM in order to speed up
|
||
common requests. We’ll improve this in the future, but for now the easiest
|
||
way to either reduce the RAM usage (at the risk of slowing things down)
|
||
is to set the almost-undocumented <code>SYNAPSE_CACHE_FACTOR</code> environment
|
||
variable. The default is 0.5, which can be decreased to reduce RAM usage
|
||
in memory constrained environments, or increased if performance starts to
|
||
degrade.</p>
|
||
<p>However, degraded performance due to a low cache factor, common on
|
||
machines with slow disks, often leads to explosions in memory use due to
|
||
backlogged requests. In this case, reducing the cache factor will make
|
||
things worse. Instead, try increasing it drastically. 2.0 is a good
|
||
starting value.</p>
|
||
<p>Using <a href="https://jemalloc.net">libjemalloc</a> can also yield a significant
|
||
improvement in overall memory use, and especially in terms of giving back
|
||
RAM to the OS. To use it, the library must simply be put in the
|
||
LD_PRELOAD environment variable when launching Synapse. On Debian, this
|
||
can be done by installing the <code>libjemalloc2</code> package and adding this
|
||
line to <code>/etc/default/matrix-synapse</code>:</p>
|
||
<pre><code>LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
|
||
</code></pre>
|
||
<p><em>Note</em>: You may need to set <code>PYTHONMALLOC=malloc</code> to ensure that <code>jemalloc</code> can accurately calculate memory usage. By default, Python uses its internal small-object allocator, which may interfere with jemalloc’s ability to track memory consumption correctly. This could prevent the <a href="../configuration/config_documentation.html#caches">cache_autotuning</a> feature from functioning as expected, as the Python allocator may not reach the memory threshold set by <code>max_cache_memory_usage</code>, thus not triggering the cache eviction process.</p>
|
||
<p>This made a significant difference on Python 2.7 - it’s unclear how
|
||
much of an improvement it provides on Python 3.x.</p>
|
||
<p>If you’re encountering high CPU use by the Synapse process itself, you
|
||
may be affected by a bug with presence tracking that leads to a
|
||
massive excess of outgoing federation requests (see <a href="https://github.com/matrix-org/synapse/issues/3971">discussion</a>). If metrics
|
||
indicate that your server is also issuing far more outgoing federation
|
||
requests than can be accounted for by your users’ activity, this is a
|
||
likely cause. The misbehavior can be worked around by disabling presence
|
||
in the Synapse config file: <a href="../configuration/config_documentation.html#presence">see here</a>.</p>
|
||
<h2 id="running-out-of-file-handles"><a class="header" href="#running-out-of-file-handles">Running out of File Handles</a></h2>
|
||
<p>If Synapse runs out of file handles, it typically fails badly - live-locking
|
||
at 100% CPU, and/or failing to accept new TCP connections (blocking the
|
||
connecting client). Matrix currently can legitimately use a lot of file handles,
|
||
thanks to busy rooms like <code>#matrix:matrix.org</code> containing hundreds of participating
|
||
servers. The first time a server talks in a room it will try to connect
|
||
simultaneously to all participating servers, which could exhaust the available
|
||
file descriptors between DNS queries & HTTPS sockets, especially if DNS is slow
|
||
to respond. (We need to improve the routing algorithm used to be better than
|
||
full mesh, but as of March 2019 this hasn’t happened yet).</p>
|
||
<p>If you hit this failure mode, we recommend increasing the maximum number of
|
||
open file handles to be at least 4096 (assuming a default of 1024 or 256).
|
||
This is typically done by editing <code>/etc/security/limits.conf</code></p>
|
||
<p>Separately, Synapse may leak file handles if inbound HTTP requests get stuck
|
||
during processing - e.g. blocked behind a lock or talking to a remote server etc.
|
||
This is best diagnosed by matching up the ‘Received request’ and ‘Processed request’
|
||
log lines and looking for any ‘Processed request’ lines which take more than
|
||
a few seconds to execute. Please let us know at <a href="https://matrix.to/#/#synapse-dev:matrix.org"><code>#synapse:matrix.org</code></a> if
|
||
you see this failure mode so we can help debug it, however.</p>
|
||
|
||
</main>
|
||
|
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<nav class="nav-wrapper" aria-label="Page navigation">
|
||
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