view mod_limits/README.markdown @ 4340:7cd3b7ec59e9

mod_http_oauth2: Rudimentary support for scopes (but not really) We don't support limiting access, but this change will inform the client what permissions the created token has (e.g. is the user an admin or not). There is some work in progress on real scope support.
author Matthew Wild <mwild1@gmail.com>
date Sat, 16 Jan 2021 19:47:22 +0000
parents 8de50be756e5
children b935276ab1b4
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---
labels:
- 'Stage-Beta'
summary: 'Connection-level rate limiting'
...

Introduction
============

On some servers, especially public ones, it is desired to make sure that
everyone gets their fair share of system resources (and no more).

mod\_limits allows you to specify traffic bandwidth limits, preventing
any single connection hogging the server's CPU, RAM and bandwidth.

Details
=======

mod\_limits detects when a connection has exceeded its traffic allowance
and temporarily ignores a connection. Due to the way TCP and the OS's
network API works no data is lost, only slowed.

Configuration
=============

Currently mod\_limits is configured per connection type. The possible
connection types are:

-   c2s
-   s2sin
-   s2sout
-   component

The limits are specified like so in the **global** section of your
config (they cannot be per-host):

``` {.lua}
limits = {
  c2s = {
    rate = "3kb/s";
    burst = "2s";
  };
  s2sin = {
    rate = "10kb/s";
    burst = "5s";
  };
}
```

All units are in terms of *bytes*, not *bits*, so that "kb/s" is
interpreted as "kilobytes per second", where a kilobyte is 1000 bytes.

Compatibility
=============

  ----- -------------------
  0.9   Works
  0.8   Doesn't work(\*)
  ----- -------------------

(\*) This module can be made to work in 0.8 if you do two things:

1.  Install
    [util.throttle](http://hg.prosody.im/0.9/raw-file/d46948d3018a/util/throttle.lua)
    into your Prosody source's util/ directory.
2.  If you use libevent apply [this
    patch](http://prosody.im/patches/prosody08-mod-limits-fix.patch) to
    net/server\_event.lua.