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annotate mod_limits/README.markdown @ 2491:5fbca7de2088

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mod_smacks: Send out more ack requests where needed Under some circumstances it was possible that more than "max_unacked_stanzas" where left in the outgoing stanza queue without forcing an ack. This could happen, when more stanzas entered the queue while the last ack request was still unanswered. Now the test "#queue > max_unacked_stanzas" is done upon receiving an ack as well as when sending out stanzas, which fixes this bug.
author tmolitor <thilo@eightysoft.de>
date Sun, 12 Feb 2017 19:27:50 +0100
parents 8de50be756e5
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.