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Docs: Add Nginx loadbalancing example with sticky mxid for workers (#15411)

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* Docs: Add Nginx loadbalancing example with sticky mxid for workers

Add example nginx configuration snippet that

* does load balancing for workers
* respects mxid part of the token
  * from both url parameter and auth header
  * and handles since parameter

Thanks to @olmari for pushing me to write this and testing the configs

Signed-off-by: Tatu Wikman <tatu.wikman@gmail.com>

* Add changelog entry

Signed-off-by: Tatu Wikman <tatu.wikman@gmail.com>

* Update codeblock formatter

Co-authored-by: Dirk Klimpel <5740567+dklimpel@users.noreply.github.com>

* Remove indirectly related nginx-config

Signed-off-by: Sami Olmari <sami@olmari.fi>

* Proper definition of action how to target username for worker

Signed-off-by: Sami Olmari <sami@olmari.fi>

* Change "nginx" to general "reverse proxy" as it's concept now.

Signed-off-by: Sami Olmari <sami@olmari.fi>

* Wording in better English

Co-authored-by: Tatu Wikman <tatu.wikman@gmail.com>

* rename changelog entry to have correct extension

---------

Signed-off-by: Tatu Wikman <tatu.wikman@gmail.com>
Signed-off-by: Sami Olmari <sami@olmari.fi>
Co-authored-by: Dirk Klimpel <5740567+dklimpel@users.noreply.github.com>
Co-authored-by: Sami Olmari <sami@olmari.fi>
Co-authored-by: Sami Olmari <sami+github@olmari.fi>
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changelog.d/15411.doc Normal file
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Docs: Add Nginx loadbalancing example with sticky mxid for workers.

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docs/workers.md
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@ -325,8 +325,7 @@ load balancing can be done in different ways.
For `/sync` and `/initialSync` requests it will be more efficient if all
requests from a particular user are routed to a single instance. This can
be done e.g. in nginx via IP `hash $http_x_forwarded_for;` or via
`hash $http_authorization consistent;` which contains the users access token.
be done in reverse proxy by extracting username part from the users access token.
Admins may additionally wish to separate out `/sync`
requests that have a `since` query parameter from those that don't (and
@ -335,6 +334,69 @@ when a user logs in on a new device and can be *very* resource intensive, so
isolating these requests will stop them from interfering with other users ongoing
syncs.
Example `nginx` configuration snippet that handles the cases above. This is just an
example and probably requires some changes according to your particular setup:
```nginx
# Choose sync worker based on the existence of "since" query parameter
map $arg_since $sync {
default synapse_sync;
'' synapse_initial_sync;
}
# Extract username from access token passed as URL parameter
map $arg_access_token $accesstoken_from_urlparam {
# Defaults to just passing back the whole accesstoken
default $arg_access_token;
# Try to extract username part from accesstoken URL parameter
"~syt_(?<username>.*?)_.*" $username;
}
# Extract username from access token passed as authorization header
map $http_authorization $mxid_localpart {
# Defaults to just passing back the whole accesstoken
default $http_authorization;
# Try to extract username part from accesstoken header
"~Bearer syt_(?<username>.*?)_.*" $username;
# if no authorization-header exist, try mapper for URL parameter "access_token"
"" $accesstoken_from_urlparam;
}
upstream synapse_initial_sync {
# Use the username mapper result for hash key
hash $mxid_localpart consistent;
server 127.0.0.1:8016;
server 127.0.0.1:8036;
}
upstream synapse_sync {
# Use the username mapper result for hash key
hash $mxid_localpart consistent;
server 127.0.0.1:8013;
server 127.0.0.1:8037;
server 127.0.0.1:8038;
server 127.0.0.1:8039;
}
# Sync initial/normal
location ~ ^/_matrix/client/(r0|v3)/sync$ {
proxy_pass http://$sync;
}
# Normal sync
location ~ ^/_matrix/client/(api/v1|r0|v3)/events$ {
proxy_pass http://synapse_sync;
}
# Initial_sync
location ~ ^/_matrix/client/(api/v1|r0|v3)/initialSync$ {
proxy_pass http://synapse_initial_sync;
}
location ~ ^/_matrix/client/(api/v1|r0|v3)/rooms/[^/]+/initialSync$ {
proxy_pass http://synapse_initial_sync;
}
```
Federation and client requests can be balanced via simple round robin.
The inbound federation transaction request `^/_matrix/federation/v1/send/`