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annotate mod_limits/README.markdown @ 4646:072d078be095

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mod_storage_xmlarchive: Advertise capabilities (none atm) Both 'total' and 'quota' would be prohibitively expensive for the kind of archives this module targets as it would require counting items across the entire archive.
author Kim Alvefur <zash@zash.se>
date Fri, 13 Aug 2021 01:18:32 +0200
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children b935276ab1b4
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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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36
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37 ``` {.lua}
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38 limits = {
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39 c2s = {
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40 rate = "3kb/s";
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41 burst = "2s";
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42 };
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43 s2sin = {
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44 rate = "10kb/s";
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45 burst = "5s";
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46 };
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47 }
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48 ```
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50 All units are in terms of *bytes*, not *bits*, so that "kb/s" is
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51 interpreted as "kilobytes per second", where a kilobyte is 1000 bytes.
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53 Compatibility
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54 =============
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55
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56 ----- -------------------
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57 0.9 Works
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58 0.8 Doesn't work(\*)
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59 ----- -------------------
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61 (\*) This module can be made to work in 0.8 if you do two things:
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63 1. Install
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64 [util.throttle](http://hg.prosody.im/0.9/raw-file/d46948d3018a/util/throttle.lua)
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65 into your Prosody source's util/ directory.
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66 2. If you use libevent apply [this
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67 patch](http://prosody.im/patches/prosody08-mod-limits-fix.patch) to
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68 net/server\_event.lua.