view mod_limits/README.markdown @ 4688:05725276fac0

mod_bookmarks2: Use same default as mod_pep for max_items Should fix the issue with max items until the proper "max" can be used, by following the configured max. While "max" is already in trunk, it's not easily usable in 0.11.x This limit and option was added to mod_pep in Prosody rev aefb96a52f5f
author Kim Alvefur <zash@zash.se>
date Wed, 15 Sep 2021 17:39:37 +0200
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.