1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
Using Postgres
--------------
Postgres version 9.4 or later is known to work.
Set up database
===============
Assuming your PostgreSQL database user is called ``postgres``, create a user
``synapse_user`` with::
su - postgres
createuser --pwprompt synapse_user
The PostgreSQL database used *must* have the correct encoding set, otherwise it
would not be able to store UTF8 strings. To create a database with the correct
encoding use, e.g.::
CREATE DATABASE synapse
ENCODING 'UTF8'
LC_COLLATE='C'
LC_CTYPE='C'
template=template0
OWNER synapse_user;
This would create an appropriate database named ``synapse`` owned by the
``synapse_user`` user (which must already exist).
Set up client in Debian/Ubuntu
===========================
Postgres support depends on the postgres python connector ``psycopg2``. In the
virtual env::
sudo apt-get install libpq-dev
pip install psycopg2
Set up client in RHEL/CentOs 7
==============================
Make sure you have the appropriate version of postgres-devel installed. For a
postgres 9.4, use the postgres 9.4 packages from
[here](https://wiki.postgresql.org/wiki/YUM_Installation).
As with Debian/Ubuntu, postgres support depends on the postgres python connector
``psycopg2``. In the virtual env::
sudo yum install postgresql-devel libpqxx-devel.x86_64
export PATH=/usr/pgsql-9.4/bin/:$PATH
pip install psycopg2
Synapse config
==============
When you are ready to start using PostgreSQL, edit the ``database`` section in
your config file to match the following lines::
database:
name: psycopg2
args:
user: <user>
password: <pass>
database: <db>
host: <host>
cp_min: 5
cp_max: 10
All key, values in ``args`` are passed to the ``psycopg2.connect(..)``
function, except keys beginning with ``cp_``, which are consumed by the twisted
adbapi connection pool.
Porting from SQLite
===================
Overview
~~~~~~~~
The script ``synapse_port_db`` allows porting an existing synapse server
backed by SQLite to using PostgreSQL. This is done in as a two phase process:
1. Copy the existing SQLite database to a separate location (while the server
is down) and running the port script against that offline database.
2. 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.
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.
It is safe to at any time kill the port script and restart it.
Using the port script
~~~~~~~~~~~~~~~~~~~~~
Firstly, shut down the currently running synapse server and copy its database
file (typically ``homeserver.db``) to another location. Once the copy is
complete, restart synapse. For instance::
./synctl stop
cp homeserver.db homeserver.db.snapshot
./synctl start
Copy the old config file into a new config file::
cp homeserver.yaml homeserver-postgres.yaml
Edit the database section as described in the section *Synapse config* above
and with the SQLite snapshot located at ``homeserver.db.snapshot`` simply run::
synapse_port_db --sqlite-database homeserver.db.snapshot \
--postgres-config homeserver-postgres.yaml
The flag ``--curses`` displays a coloured curses progress UI.
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.
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 ``homeserver.db``
run::
synapse_port_db --sqlite-database homeserver.db \
--postgres-config homeserver-postgres.yaml
Once that has completed, change the synapse config to point at the PostgreSQL
database configuration file ``homeserver-postgres.yaml``::
./synctl stop
mv homeserver.yaml homeserver-old-sqlite.yaml
mv homeserver-postgres.yaml homeserver.yaml
./synctl start
Synapse should now be running against PostgreSQL.
|
