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mod_limits/README.markdown @ 1803:4d73a1a6ba68

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author Kim Alvefur <zash@zash.se>
date Fri, 28 Aug 2015 18:03:58 +0200
parent 1782:mod_limits/README.wiki@29f3d6b7ad16
child 1820:8de50be756e5
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1 ---
2 labels:
3 - 'Stage-Beta'
4 summary: 'Connection-level rate limiting'
5 ...
6
7 Introduction
8 ============
9
10 On some servers, especially public ones, it is desired to make sure that
11 everyone gets their fair share of system resources (and no more).
12
13 mod\_limits allows you to specify traffic bandwidth limits, preventing
14 any single connection hogging the server's CPU, RAM and bandwidth.
15
16 Details
17 =======
18
19 mod\_limits detects when a connection has exceeded its traffic allowance
20 and temporarily ignores a connection. Due to the way TCP and the OS's
21 network API works no data is lost, only slowed.
22
23 Configuration
24 =============
25
26 Currently mod\_limits is configured per connection type. The possible
27 connection types are:
28
29 - c2s
30 - s2sin
31 - s2sout
32 - component
33
34 The limits are specified like so in the **global** section of your
35 config (they cannot be per-host):
36
37 limits = {
38 c2s = {
39 rate = "3kb/s";
40 burst = "2s";
41 };
42 s2sin = {
43 rate = "10kb/s";
44 burst = "5s";
45 };
46 }
47
48 All units are in terms of *bytes*, not *bits*, so that "kb/s" is
49 interpreted as "kilobytes per second", where a kilobyte is 1000 bytes.
50
51 Compatibility
52 =============
53
54 ----- -------------------
55 0.9 Works
56 0.8 Doesn't work(`*`)
57 ----- -------------------
58
59 (`*`) This module can be made to work in 0.8 if you do two things:
60
61 1. Install
62 [util.throttle](http://hg.prosody.im/0.9/raw-file/d46948d3018a/util/throttle.lua)
63 into your Prosody source's util/ directory.
64 2. If you use libevent apply [this
65 patch](http://prosody.im/patches/prosody08-mod-limits-fix.patch) to
66 net/server\_event.lua.