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Restructuring.

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Hans van Zijst 2024-12-09 18:51:29 +01:00 • committed by Hans van Zijst
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48
matrix/synapse/workers.md
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@ -11,6 +11,17 @@ the load. So you want to create several threads for different types of work.
See this [Matrix blog](https://matrix.org/blog/2020/11/03/how-we-fixed-synapse-s-scalability/)
for some background information.
The traditional Synapse setup is one monolithic piece of software that does
everything. Joining a very busy room makes a bottleneck, as the server will
spend all its cycles on synchronizing that room.
You can split the server into workers, that are basically Synapse servers
themselves. Redirect specific tasks to them and you have several different
servers doing all kinds of tasks at the same time. A busy room will no longer
freeze the rest.
Workers communicate with each other via socket files and Redis.
# Redis
@ -45,12 +56,19 @@ longer active, and if the socketfile `/run/redis/redis-server.sock` exists.
# Synapse
First, create the directory where all the socket files for workers will come,
Workers communicate with each other over sockets, that are all placed in one
directory. To make sure only the users that need access will have it, we
create a new group and add the users to it.
Then, create the directory where all the socket files for workers will come,
and give it the correct user, group and permission:
```
groupadd --system clubmatrix
useradd matrix-synapse clubmatrix
useradd www-data clubmatrix
mkdir /run/matrix-synapse
dpkg-statoverride --add --update matrix-synapse matrix-synapse 0770 /run/matrix-synapse
dpkg-statoverride --add --update matrix-synapse clubmatrix 2770 /run/matrix-synapse
```
Add a replication listener:
@ -89,29 +107,9 @@ synapse.replication.tcp.redis - 141 - INFO - subscribe-replication-0 - Successfu
synapse.replication.tcp.redis - 146 - INFO - subscribe-replication-0 - REPLICATE successfully sent
```
# Workers
Workers are Synapse instances that perform a single job (or a set of jobs).
Their configuration goes into `/etc/matrix-synapse/workers`, which we have to
create first.
Create a worker for
# Preparing for sockets
Because we use sockets for speed, we should make sure only those programs that
need access to those sockets get it.
Create a new group and add the users that need access to it:
```
addgroup --system clubmatrix
addgroup matrix-synapse clubmatrix
addgroup www-data clubmatrix
```
Create one systemd service file for all workers:
Every worker has its own configuration file, we'll put those under
`/etc/matrix-synapse/workers`. Create it, and then one systemd service file for
all workers:
```
[Unit]