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annotate mod_limits/README.markdown @ 4515:2e33eeafe962

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mod_muc_markers: Prevent any markers from reaching the archive, even if untracked Original intention was to leave alone things that this module isn't handling. However markers in archives are just problematic without more advanced logic about what is markable and what is not. It also requires a more advanced query in mod_muc_rai to determine the latest markable message instead of the latest archived message. I'd rather keep the "is archivable" and "is markable" definition the same for simplicity. I don't want to introduce yet another set of rules for no reason. No markers in MAM.
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Mar 2021 15:55:02 +0000
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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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.