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annotate xml/en/docs/http/ngx_http_limit_conn_module.xml @ 617:368a449e85b8

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Expanded documentation of what various parameters of the "listen" directive related to socket options do. While here, documented the fact that accept filters also work on NetBSD.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 02 Aug 2012 13:24:07 +0000
parents 39a51e664374
children af3f38e349eb
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_limit_conn_module"
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11 link="/en/docs/http/ngx_http_limit_conn_module.html"
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12 lang="en"
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13 rev="1">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_http_limit_conn_module</literal> module allows
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19 to limit the number of connections per defined key, in
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20 particular, the number of connections from a single IP address.
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21 </para>
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22
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23 <para>
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24 Not all connections are counted; only those that have requests
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25 currently being processed by the server, in which request header has
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26 been fully read.
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27 </para>
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28
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29 </section>
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30
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31
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32 <section id="example" name="Example Configuration">
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33
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34 <para>
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35 <example>
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36 http {
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37 limit_conn_zone $binary_remote_addr zone=addr:10m;
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38
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39 ...
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40
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41 server {
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42
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43 ...
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44
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45 location /download/ {
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46 limit_conn addr 1;
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47 }
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48 </example>
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49 </para>
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50
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51 </section>
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52
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53
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54 <section id="directives" name="Directives">
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55
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56 <directive name="limit_conn">
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57 <syntax><value>zone</value> <value>number</value></syntax>
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58 <default/>
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59 <context>http</context>
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60 <context>server</context>
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61 <context>location</context>
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62
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63 <para>
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64 Sets a shared memory zone
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65 and the maximum allowed number of connections for a given key value.
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66 When this limit is exceeded, the server will return error
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67 <http-status code="503" text="Service Temporarily Unavailable"/>
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68 in reply to a request.
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69 For example, the directives
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70 <example>
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71 limit_conn_zone $binary_remote_addr zone=addr:10m;
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72
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73 server {
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74 location /download/ {
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75 limit_conn addr 1;
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76 }
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77 </example>
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78 allow for only a single connection at a time, per unique IP address.
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79 </para>
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80
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81 <para>
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82 When several <literal>limit_conn</literal> directives are specified,
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83 any configured limit will apply.
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84 For example, the following configuration will limit the number
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85 of connections to the server per client IP and at the same time
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86 will limit the total number of connections to the virtual host:
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87 <example>
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88 limit_conn_zone $binary_remote_addr zone=perip:10m;
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89 limit_conn_zone $server_name zone=perserver:10m;
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90
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91 server {
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92 ...
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93 limit_conn perip 10;
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94 limit_conn perserver 100;
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95 }
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96 </example>
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97
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98 </para>
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99
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100 <para>
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101 These directives are inherited from the previous level if and
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102 only if there are no
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103 <literal>limit_conn</literal>
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104 directives on the current level.
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105 </para>
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106
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107 </directive>
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108
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109
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110 <directive name="limit_conn_log_level">
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111 <syntax>
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112 <literal>info</literal> |
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113 <literal>notice</literal> |
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114 <literal>warn</literal> |
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115 <literal>error</literal></syntax>
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116 <default>error</default>
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117 <context>http</context>
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118 <context>server</context>
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119 <context>location</context>
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120 <appeared-in>0.8.18</appeared-in>
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121
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122 <para>
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123 Sets the desired logging level for cases when the server
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124 limits the number of connections.
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125 </para>
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126
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127 </directive>
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128
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129
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130 <directive name="limit_conn_zone">
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131 <syntax>
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132 <value>$variable</value>
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133 <literal>zone</literal>=<value>name</value>:<value>size</value></syntax>
179
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134 <default/>
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135 <context>http</context>
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136
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137 <para>
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138 Sets parameters of a shared memory zone that keeps states
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139 for various keys.
179
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140 This state stores the current number of connections in particular.
390
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141 The key is any non-empty value of the specified variable
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142 (empty values are not accounted).
179
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143 Example usage:
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144 <example>
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145 limit_conn_zone $binary_remote_addr zone=addr:10m;
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146 </example>
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147 Here, an IP address of the client serves as a key.
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148 Note that instead of <var>$remote_addr</var>, the
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149 <var>$binary_remote_addr</var> variable is used here.
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150 The length of the <var>$remote_addr</var> variable's value can
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151 range from 7 to 15 bytes, and the stored state occupies either
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152 32 or 64 bytes of memory on 32-bit platforms, and always 64
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153 bytes on 64-bit platforms.
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154 The length of the <var>$binary_remote_addr</var> variable's value
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155 is always 4 bytes, and the stored state always occupies 32 bytes
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156 on 32-bit platforms, and 64 bytes on 64-bit platforms.
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157 One megabyte zone can keep about 32 thousand 32-byte states,
179
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158 and about 16 thousand 64-byte states.
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159 If the storage for a zone is exhausted, the server will return error
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160 <http-status code="503" text="Service Temporarily Unavailable"/>
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161 to all further requests.
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162 </para>
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163
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164 </directive>
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165
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166
179
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167 <directive name="limit_zone">
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168 <syntax>
271
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169 <value>name</value>
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170 <value>$variable</value>
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171 <value>size</value></syntax>
179
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172 <default/>
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173 <context>http</context>
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174
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175 <para>
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176 This directive is made obsolete in version 1.1.8,
180
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177 an equivalent <link id="limit_conn_zone"/> directive
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178 with a changed syntax should be used instead:
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179 <note>
271
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180 <literal>limit_conn_zone</literal>
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181 <value>$variable</value>
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182 <literal>zone</literal>=<value>name</value>:<value>size</value>;
180
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183 </note>
179
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184 </para>
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185
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186 </directive>
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187
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188 </section>
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189
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190 </module>