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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" class="active">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="setup/forward_proxy.html">Configuring a Forward/Outbound 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="upgrade.html">Upgrading 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<h1 id="using-postgres"><a class="header" href="#using-postgres">Using Postgres</a></h1>
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<p>Synapse supports PostgreSQL versions 10 or later.</p>
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<h2 id="install-postgres-client-libraries"><a class="header" href="#install-postgres-client-libraries">Install postgres client libraries</a></h2>
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<p>Synapse will require the python postgres client library in order to
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connect to a postgres database.</p>
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<ul>
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<li>
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<p>If you are using the <a href="setup/installation.html#matrixorg-packages">matrix.org debian/ubuntu
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packages</a>, the necessary python
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library will already be installed, but you will need to ensure the
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low-level postgres library is installed, which you can do with
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<code>apt install libpq5</code>.</p>
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</li>
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<li>
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<p>For other pre-built packages, please consult the documentation from
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the relevant package.</p>
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</li>
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<li>
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<p>If you installed synapse <a href="setup/installation.html#installing-from-source">in a
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virtualenv</a>, you can install
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the library with:</p>
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<pre><code>~/synapse/env/bin/pip install "matrix-synapse[postgres]"
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</code></pre>
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<p>(substituting the path to your virtualenv for <code>~/synapse/env</code>, if
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you used a different path). You will require the postgres
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development files. These are in the <code>libpq-dev</code> package on
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Debian-derived distributions.</p>
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</li>
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</ul>
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<h2 id="set-up-database"><a class="header" href="#set-up-database">Set up database</a></h2>
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<p>Assuming your PostgreSQL database user is called <code>postgres</code>, first authenticate as the database user with:</p>
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<pre><code class="language-sh">su - postgres
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# Or, if your system uses sudo to get administrative rights
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sudo -u postgres bash
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</code></pre>
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<p>Then, create a postgres user and a database with:</p>
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<pre><code class="language-sh"># this will prompt for a password for the new user
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createuser --pwprompt synapse_user
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createdb --encoding=UTF8 --locale=C --template=template0 --owner=synapse_user synapse
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</code></pre>
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<p>The above will create a user called <code>synapse_user</code>, and a database called
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<code>synapse</code>.</p>
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<p>Note that the PostgreSQL database <em>must</em> have the correct encoding set
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(as shown above), otherwise it will not be able to store UTF8 strings.</p>
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<p>You may need to enable password authentication so <code>synapse_user</code> can
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connect to the database. See
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<a href="https://www.postgresql.org/docs/current/auth-pg-hba-conf.html">https://www.postgresql.org/docs/current/auth-pg-hba-conf.html</a>.</p>
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<h2 id="synapse-config"><a class="header" href="#synapse-config">Synapse config</a></h2>
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<p>When you are ready to start using PostgreSQL, edit the <code>database</code>
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section in your config file to match the following lines:</p>
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<pre><code class="language-yaml">database:
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name: psycopg2
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args:
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user: <user>
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password: <pass>
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database: <db>
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host: <host>
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cp_min: 5
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cp_max: 10
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</code></pre>
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<p>All key, values in <code>args</code> are passed to the <code>psycopg2.connect(..)</code>
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function, except keys beginning with <code>cp_</code>, which are consumed by the
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twisted adbapi connection pool. See the <a href="https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS">libpq
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documentation</a>
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for a list of options which can be passed.</p>
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<p>You should consider tuning the <code>args.keepalives_*</code> options if there is any danger of
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the connection between your homeserver and database dropping, otherwise Synapse
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may block for an extended period while it waits for a response from the
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database server. Example values might be:</p>
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<pre><code class="language-yaml">database:
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args:
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# ... as above
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# seconds of inactivity after which TCP should send a keepalive message to the server
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keepalives_idle: 10
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# the number of seconds after which a TCP keepalive message that is not
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# acknowledged by the server should be retransmitted
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keepalives_interval: 10
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# the number of TCP keepalives that can be lost before the client's connection
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# to the server is considered dead
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keepalives_count: 3
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</code></pre>
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<h2 id="tuning-postgres"><a class="header" href="#tuning-postgres">Tuning Postgres</a></h2>
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<p>The default settings should be fine for most deployments. For larger
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scale deployments tuning some of the settings is recommended, details of
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which can be found at
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<a href="https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server">https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server</a>.</p>
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<p>In particular, we've found tuning the following values helpful for
|
|
performance:</p>
|
|
<ul>
|
|
<li><code>shared_buffers</code></li>
|
|
<li><code>effective_cache_size</code></li>
|
|
<li><code>work_mem</code></li>
|
|
<li><code>maintenance_work_mem</code></li>
|
|
<li><code>autovacuum_work_mem</code></li>
|
|
</ul>
|
|
<p>Note that the appropriate values for those fields depend on the amount
|
|
of free memory the database host has available.</p>
|
|
<p>Additionally, admins of large deployments might want to consider using huge pages
|
|
to help manage memory, especially when using large values of <code>shared_buffers</code>. You
|
|
can read more about that <a href="https://www.postgresql.org/docs/10/kernel-resources.html#LINUX-HUGE-PAGES">here</a>.</p>
|
|
<h2 id="porting-from-sqlite"><a class="header" href="#porting-from-sqlite">Porting from SQLite</a></h2>
|
|
<h3 id="overview"><a class="header" href="#overview">Overview</a></h3>
|
|
<p>The script <code>synapse_port_db</code> allows porting an existing synapse server
|
|
backed by SQLite to using PostgreSQL. This is done in as a two phase
|
|
process:</p>
|
|
<ol>
|
|
<li>Copy the existing SQLite database to a separate location and run
|
|
the port script against that offline database.</li>
|
|
<li>Shut down the server. Rerun the port script to port any data that
|
|
has come in since taking the first snapshot. Restart server against
|
|
the PostgreSQL database.</li>
|
|
</ol>
|
|
<p>The port script is designed to be run repeatedly against newer snapshots
|
|
of the SQLite database file. This makes it safe to repeat step 1 if
|
|
there was a delay between taking the previous snapshot and being ready
|
|
to do step 2.</p>
|
|
<p>It is safe to at any time kill the port script and restart it.</p>
|
|
<p>Note that the database may take up significantly more (25% - 100% more)
|
|
space on disk after porting to Postgres.</p>
|
|
<h3 id="using-the-port-script"><a class="header" href="#using-the-port-script">Using the port script</a></h3>
|
|
<p>Firstly, shut down the currently running synapse server and copy its
|
|
database file (typically <code>homeserver.db</code>) to another location. Once the
|
|
copy is complete, restart synapse. For instance:</p>
|
|
<pre><code class="language-sh">./synctl stop
|
|
cp homeserver.db homeserver.db.snapshot
|
|
./synctl start
|
|
</code></pre>
|
|
<p>Copy the old config file into a new config file:</p>
|
|
<pre><code class="language-sh">cp homeserver.yaml homeserver-postgres.yaml
|
|
</code></pre>
|
|
<p>Edit the database section as described in the section <em>Synapse config</em>
|
|
above and with the SQLite snapshot located at <code>homeserver.db.snapshot</code>
|
|
simply run:</p>
|
|
<pre><code class="language-sh">synapse_port_db --sqlite-database homeserver.db.snapshot \
|
|
--postgres-config homeserver-postgres.yaml
|
|
</code></pre>
|
|
<p>The flag <code>--curses</code> displays a coloured curses progress UI.</p>
|
|
<p>If the script took a long time to complete, or time has otherwise passed
|
|
since the original snapshot was taken, repeat the previous steps with a
|
|
newer snapshot.</p>
|
|
<p>To complete the conversion shut down the synapse server and run the port
|
|
script one last time, e.g. if the SQLite database is at <code>homeserver.db</code>
|
|
run:</p>
|
|
<pre><code class="language-sh">synapse_port_db --sqlite-database homeserver.db \
|
|
--postgres-config homeserver-postgres.yaml
|
|
</code></pre>
|
|
<p>Once that has completed, change the synapse config to point at the
|
|
PostgreSQL database configuration file <code>homeserver-postgres.yaml</code>:</p>
|
|
<pre><code class="language-sh">./synctl stop
|
|
mv homeserver.yaml homeserver-old-sqlite.yaml
|
|
mv homeserver-postgres.yaml homeserver.yaml
|
|
./synctl start
|
|
</code></pre>
|
|
<p>Synapse should now be running against PostgreSQL.</p>
|
|
<h2 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h2>
|
|
<h3 id="alternative-auth-methods"><a class="header" href="#alternative-auth-methods">Alternative auth methods</a></h3>
|
|
<p>If you get an error along the lines of <code>FATAL: Ident authentication failed for user "synapse_user"</code>, you may need to use an authentication method other than
|
|
<code>ident</code>:</p>
|
|
<ul>
|
|
<li>
|
|
<p>If the <code>synapse_user</code> user has a password, add the password to the <code>database:</code>
|
|
section of <code>homeserver.yaml</code>. Then add the following to <code>pg_hba.conf</code>:</p>
|
|
<pre><code>host synapse synapse_user ::1/128 md5 # or `scram-sha-256` instead of `md5` if you use that
|
|
</code></pre>
|
|
</li>
|
|
<li>
|
|
<p>If the <code>synapse_user</code> user does not have a password, then a password doesn't
|
|
have to be added to <code>homeserver.yaml</code>. But the following does need to be added
|
|
to <code>pg_hba.conf</code>:</p>
|
|
<pre><code>host synapse synapse_user ::1/128 trust
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
<p>Note that line order matters in <code>pg_hba.conf</code>, so make sure that if you do add a
|
|
new line, it is inserted before:</p>
|
|
<pre><code>host all all ::1/128 ident
|
|
</code></pre>
|
|
<h3 id="fixing-incorrect-collate-or-ctype"><a class="header" href="#fixing-incorrect-collate-or-ctype">Fixing incorrect <code>COLLATE</code> or <code>CTYPE</code></a></h3>
|
|
<p>Synapse will refuse to set up a new database if it has the wrong values of
|
|
<code>COLLATE</code> and <code>CTYPE</code> set, and will log warnings on existing databases. Using
|
|
different locales can cause issues if the locale library is updated from
|
|
underneath the database, or if a different version of the locale is used on any
|
|
replicas.</p>
|
|
<p>The safest way to fix the issue is to dump the database and recreate it with
|
|
the correct locale parameter (as shown above). It is also possible to change the
|
|
parameters on a live database and run a <code>REINDEX</code> on the entire database,
|
|
however extreme care must be taken to avoid database corruption.</p>
|
|
<p>Note that the above may fail with an error about duplicate rows if corruption
|
|
has already occurred, and such duplicate rows will need to be manually removed.</p>
|
|
<h3 id="fixing-inconsistent-sequences-error"><a class="header" href="#fixing-inconsistent-sequences-error">Fixing inconsistent sequences error</a></h3>
|
|
<p>Synapse uses Postgres sequences to generate IDs for various tables. A sequence
|
|
and associated table can get out of sync if, for example, Synapse has been
|
|
downgraded and then upgraded again.</p>
|
|
<p>To fix the issue shut down Synapse (including any and all workers) and run the
|
|
SQL command included in the error message. Once done Synapse should start
|
|
successfully.</p>
|
|
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