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annotate mod_limits/README.markdown @ 1804:3228fb928a93

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mod_mam/README: Minor fixup
author Kim Alvefur <zash@zash.se>
date Sun, 30 Aug 2015 03:05:53 +0200
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: 'Connection-level rate limiting'
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5 ...
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7 Introduction
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8 ============
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9
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10 On some servers, especially public ones, it is desired to make sure that
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11 everyone gets their fair share of system resources (and no more).
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13 mod\_limits allows you to specify traffic bandwidth limits, preventing
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14 any single connection hogging the server's CPU, RAM and bandwidth.
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16 Details
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17 =======
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19 mod\_limits detects when a connection has exceeded its traffic allowance
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20 and temporarily ignores a connection. Due to the way TCP and the OS's
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21 network API works no data is lost, only slowed.
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23 Configuration
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24 =============
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25
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26 Currently mod\_limits is configured per connection type. The possible
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27 connection types are:
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29 - c2s
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30 - s2sin
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31 - s2sout
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32 - component
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33
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34 The limits are specified like so in the **global** section of your
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35 config (they cannot be per-host):
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37 limits = {
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38 c2s = {
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39 rate = "3kb/s";
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40 burst = "2s";
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41 };
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42 s2sin = {
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43 rate = "10kb/s";
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44 burst = "5s";
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45 };
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46 }
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48 All units are in terms of *bytes*, not *bits*, so that "kb/s" is
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49 interpreted as "kilobytes per second", where a kilobyte is 1000 bytes.
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51 Compatibility
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52 =============
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53
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54 ----- -------------------
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55 0.9 Works
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56 0.8 Doesn't work(`*`)
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57 ----- -------------------
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59 (`*`) This module can be made to work in 0.8 if you do two things:
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61 1. Install
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62 [util.throttle](http://hg.prosody.im/0.9/raw-file/d46948d3018a/util/throttle.lua)
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63 into your Prosody source's util/ directory.
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64 2. If you use libevent apply [this
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65 patch](http://prosody.im/patches/prosody08-mod-limits-fix.patch) to
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66 net/server\_event.lua.