author | Kim Alvefur <zash@zash.se> |
Sun, 13 Sep 2015 15:45:40 +0200 | |
changeset 1848 | 04e168063fc7 |
parent 1824 | 8de50be756e5 |
child 4786 | b935276ab1b4 |
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--- |
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labels: |
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- 'Stage-Beta' |
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summary: 'Connection-level rate limiting' |
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... |
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Introduction |
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============ |
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10 |
On some servers, especially public ones, it is desired to make sure that |
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everyone gets their fair share of system resources (and no more). |
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mod\_limits allows you to specify traffic bandwidth limits, preventing |
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any single connection hogging the server's CPU, RAM and bandwidth. |
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Details |
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======= |
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mod\_limits detects when a connection has exceeded its traffic allowance |
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and temporarily ignores a connection. Due to the way TCP and the OS's |
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network API works no data is lost, only slowed. |
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Configuration |
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============= |
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Currently mod\_limits is configured per connection type. The possible |
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connection types are: |
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- c2s |
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- s2sin |
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- s2sout |
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- component |
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The limits are specified like so in the **global** section of your |
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config (they cannot be per-host): |
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``` {.lua} |
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limits = { |
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c2s = { |
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rate = "3kb/s"; |
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burst = "2s"; |
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}; |
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s2sin = { |
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rate = "10kb/s"; |
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burst = "5s"; |
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}; |
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} |
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``` |
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50 |
All units are in terms of *bytes*, not *bits*, so that "kb/s" is |
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interpreted as "kilobytes per second", where a kilobyte is 1000 bytes. |
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Compatibility |
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============= |
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----- ------------------- |
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0.9 Works |
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0.8 Doesn't work(\*) |
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----- ------------------- |
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(\*) This module can be made to work in 0.8 if you do two things: |
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1. Install |
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[util.throttle](http://hg.prosody.im/0.9/raw-file/d46948d3018a/util/throttle.lua) |
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into your Prosody source's util/ directory. |
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2. If you use libevent apply [this |
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patch](http://prosody.im/patches/prosody08-mod-limits-fix.patch) to |
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net/server\_event.lua. |