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- <h1 id="using-postgres"><a class="header" href="#using-postgres">Using Postgres</a></h1>
-<p>Synapse supports PostgreSQL versions 9.6 or later.</p>
-<h2 id="install-postgres-client-libraries"><a class="header" href="#install-postgres-client-libraries">Install postgres client libraries</a></h2>
-<p>Synapse will require the python postgres client library in order to
-connect to a postgres database.</p>
-<ul>
-<li>
-<p>If you are using the <a href="setup/installation.html#matrixorg-packages">matrix.org debian/ubuntu
-packages</a>, the necessary python
-library will already be installed, but you will need to ensure the
-low-level postgres library is installed, which you can do with
-<code>apt install libpq5</code>.</p>
-</li>
-<li>
-<p>For other pre-built packages, please consult the documentation from
-the relevant package.</p>
-</li>
-<li>
-<p>If you installed synapse <a href="setup/installation.html#installing-from-source">in a
-virtualenv</a>, you can install
-the library with:</p>
-<pre><code>~/synapse/env/bin/pip install "matrix-synapse[postgres]"
-</code></pre>
-<p>(substituting the path to your virtualenv for <code>~/synapse/env</code>, if
-you used a different path). You will require the postgres
-development files. These are in the <code>libpq-dev</code> package on
-Debian-derived distributions.</p>
-</li>
-</ul>
-<h2 id="set-up-database"><a class="header" href="#set-up-database">Set up database</a></h2>
-<p>Assuming your PostgreSQL database user is called <code>postgres</code>, first authenticate as the database user with:</p>
-<pre><code>su - postgres
-# Or, if your system uses sudo to get administrative rights
-sudo -u postgres bash
-</code></pre>
-<p>Then, create a postgres user and a database with:</p>
-<pre><code># this will prompt for a password for the new user
-createuser --pwprompt synapse_user
-
-createdb --encoding=UTF8 --locale=C --template=template0 --owner=synapse_user synapse
-</code></pre>
-<p>The above will create a user called <code>synapse_user</code>, and a database called
-<code>synapse</code>.</p>
-<p>Note that the PostgreSQL database <em>must</em> have the correct encoding set
-(as shown above), otherwise it will not be able to store UTF8 strings.</p>
-<p>You may need to enable password authentication so <code>synapse_user</code> can
-connect to the database. See
-<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>
-<h2 id="synapse-config"><a class="header" href="#synapse-config">Synapse config</a></h2>
-<p>When you are ready to start using PostgreSQL, edit the <code>database</code>
-section in your config file to match the following lines:</p>
-<pre><code class="language-yaml">database:
- name: psycopg2
- args:
- user: <user>
- password: <pass>
- database: <db>
- host: <host>
- cp_min: 5
- cp_max: 10
-</code></pre>
-<p>All key, values in <code>args</code> are passed to the <code>psycopg2.connect(..)</code>
-function, except keys beginning with <code>cp_</code>, which are consumed by the
-twisted adbapi connection pool. See the <a href="https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS">libpq
-documentation</a>
-for a list of options which can be passed.</p>
-<p>You should consider tuning the <code>args.keepalives_*</code> options if there is any danger of
-the connection between your homeserver and database dropping, otherwise Synapse
-may block for an extended period while it waits for a response from the
-database server. Example values might be:</p>
-<pre><code class="language-yaml">database:
- args:
- # ... as above
-
- # seconds of inactivity after which TCP should send a keepalive message to the server
- keepalives_idle: 10
-
- # the number of seconds after which a TCP keepalive message that is not
- # acknowledged by the server should be retransmitted
- keepalives_interval: 10
-
- # the number of TCP keepalives that can be lost before the client's connection
- # to the server is considered dead
- keepalives_count: 3
-</code></pre>
-<h2 id="tuning-postgres"><a class="header" href="#tuning-postgres">Tuning Postgres</a></h2>
-<p>The default settings should be fine for most deployments. For larger
-scale deployments tuning some of the settings is recommended, details of
-which can be found at
-<a href="https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server">https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server</a>.</p>
-<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>
-<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>./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>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>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>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>./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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