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154 lines
4.7 KiB
ReStructuredText
154 lines
4.7 KiB
ReStructuredText
Using Postgres
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--------------
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Postgres version 9.4 or later is known to work.
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Set up database
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===============
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Assuming your PostgreSQL database user is called ``postgres``, create a user
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``synapse_user`` with::
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su - postgres
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createuser --pwprompt synapse_user
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The PostgreSQL database used *must* have the correct encoding set, otherwise it
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would not be able to store UTF8 strings. To create a database with the correct
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encoding use, e.g.::
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CREATE DATABASE synapse
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ENCODING 'UTF8'
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LC_COLLATE='C'
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LC_CTYPE='C'
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template=template0
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OWNER synapse_user;
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This would create an appropriate database named ``synapse`` owned by the
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``synapse_user`` user (which must already exist).
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Set up client in Debian/Ubuntu
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===========================
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Postgres support depends on the postgres python connector ``psycopg2``. In the
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virtual env::
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sudo apt-get install libpq-dev
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pip install psycopg2
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Set up client in RHEL/CentOs 7
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==============================
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Make sure you have the appropriate version of postgres-devel installed. For a
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postgres 9.4, use the postgres 9.4 packages from
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[here](https://wiki.postgresql.org/wiki/YUM_Installation).
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As with Debian/Ubuntu, postgres support depends on the postgres python connector
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``psycopg2``. In the virtual env::
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sudo yum install postgresql-devel libpqxx-devel.x86_64
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export PATH=/usr/pgsql-9.4/bin/:$PATH
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pip install psycopg2
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Tuning Postgres
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===============
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The default settings should be fine for most deployments. For larger scale
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deployments tuning some of the settings is recommended, details of which can be
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found at https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server.
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In particular, we've found tuning the following values helpful for performance:
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- ``shared_buffers``
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- ``effective_cache_size``
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- ``work_mem``
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- ``maintenance_work_mem``
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- ``autovacuum_work_mem``
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Note that the appropriate values for those fields depend on the amount of free
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memory the database host has available.
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Synapse config
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==============
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When you are ready to start using PostgreSQL, edit the ``database`` section in
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your config file to match the following lines::
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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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All key, values in ``args`` are passed to the ``psycopg2.connect(..)``
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function, except keys beginning with ``cp_``, which are consumed by the twisted
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adbapi connection pool.
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Porting from SQLite
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===================
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Overview
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~~~~~~~~
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The script ``synapse_port_db`` allows porting an existing synapse server
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backed by SQLite to using PostgreSQL. This is done in as a two phase process:
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1. Copy the existing SQLite database to a separate location (while the server
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is down) and running the port script against that offline database.
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2. Shut down the server. Rerun the port script to port any data that has come
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in since taking the first snapshot. Restart server against the PostgreSQL
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database.
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The port script is designed to be run repeatedly against newer snapshots of the
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SQLite database file. This makes it safe to repeat step 1 if there was a delay
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between taking the previous snapshot and being ready to do step 2.
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It is safe to at any time kill the port script and restart it.
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Using the port script
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~~~~~~~~~~~~~~~~~~~~~
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Firstly, shut down the currently running synapse server and copy its database
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file (typically ``homeserver.db``) to another location. Once the copy is
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complete, restart synapse. For instance::
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./synctl stop
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cp homeserver.db homeserver.db.snapshot
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./synctl start
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Copy the old config file into a new config file::
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cp homeserver.yaml homeserver-postgres.yaml
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Edit the database section as described in the section *Synapse config* above
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and with the SQLite snapshot located at ``homeserver.db.snapshot`` simply run::
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synapse_port_db --sqlite-database homeserver.db.snapshot \
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--postgres-config homeserver-postgres.yaml
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The flag ``--curses`` displays a coloured curses progress UI.
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If the script took a long time to complete, or time has otherwise passed since
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the original snapshot was taken, repeat the previous steps with a newer
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snapshot.
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To complete the conversion shut down the synapse server and run the port
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script one last time, e.g. if the SQLite database is at ``homeserver.db``
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run::
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synapse_port_db --sqlite-database homeserver.db \
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--postgres-config homeserver-postgres.yaml
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Once that has completed, change the synapse config to point at the PostgreSQL
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database configuration file ``homeserver-postgres.yaml``::
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./synctl stop
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mv homeserver.yaml homeserver-old-sqlite.yaml
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mv homeserver-postgres.yaml homeserver.yaml
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./synctl start
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Synapse should now be running against PostgreSQL.
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