Mercurial > hg > ngx_http_upstream_keepalive

annotate README @ 24:2ee28064a04a 0.4

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Keepalive: correctly close connections on gracefull shutdown. On gracefull shutdown nginx calls read handler on all idle connections with c->close set. Make sure we don't confuse such read handler calls with stale events and actually close connections. This fixes "open socket ... left in connection ..." alerts.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 15 Dec 2010 21:12:36 +0300
parents f3e74fbd0f0b
children a84573f16a0c
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1 Keepalive balancer module for nginx.
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2
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3 This module implements cache for backend connections. As of now, it may
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4 be used with memcached upstreams.
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5
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6 Note: don't even try it with http backends. It won't work.
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8 Note: it's for nginx 0.7.* and up, won't work with nginx 0.6.*.
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9
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10 Configuration directives:
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12 keepalive <num> [single]
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13
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14 Scope: upstream
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15
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16 Switches on keepalive module for the upstream in question.
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17
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18 Parameters:
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19
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20 - <num>
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21 Maximum number of connections to cache. If there isn't enough
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22 room to cache new connections - last recently used connections
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23 will be kicked off the cache.
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25 - single
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26 Treat everything as single host. With this flag connections
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27 to different backends are treated as equal.
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28
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29 Sample configuration:
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30
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31 upstream memd {
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32 server 127.0.0.1:11211;
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33 server 10.0.0.2:11211;
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34 keepalive 10;
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35 }
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36
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37 This module was tested to work with standard round-robin balancing, but
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38 it's believed to be compatible with more sophisticated balancers. The only
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39 requirement is to activate them *before* this module, e.g.:
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40
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41 upstream memd {
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42 server 127.0.0.1:11211;
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43 server 10.0.0.2:11211;
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44 ip_hash;
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45 keepalive 10;
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46 }
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47
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48 To compile nginx with keepalive module, use "--add-module <path>" option to
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49 nginx configure.