annotate xml/en/docs/http/ngx_http_limit_conn_module.xml @ 580:be54c443235a

Added copyright markers to documentation sources.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 10 Jul 2012 12:59:42 +0000
parents ebcb351d9eb3
children 764fbac1b8b4
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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
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14 <section id="summary">
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15
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16 <para>
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17 The <literal>ngx_http_limit_conn_module</literal> module allows
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18 to limit the number of connections per defined key, in
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19 particular, the number of connections from a single IP address.
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20 </para>
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21
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22 <para>
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23 Not all connections are counted; only those that have requests
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24 currently being processed by the server, in which request header has
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25 been fully read.
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26 </para>
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27
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28 </section>
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29
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30
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31 <section id="example" name="Example Configuration">
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33 <para>
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34 <example>
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35 http {
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36 limit_conn_zone $binary_remote_addr zone=addr:10m;
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37
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38 ...
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39
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40 server {
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41
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42 ...
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43
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44 location /download/ {
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45 limit_conn addr 1;
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46 }
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47 </example>
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48 </para>
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49
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50 </section>
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51
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52
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53 <section id="directives" name="Directives">
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54
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55 <directive name="limit_conn">
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56 <syntax><value>zone</value> <value>number</value></syntax>
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57 <default/>
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58 <context>http</context>
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59 <context>server</context>
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60 <context>location</context>
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61
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62 <para>
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63 Sets a shared memory zone
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64 and the maximum allowed number of connections for a given key value.
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65 When this limit is exceeded, the server will return error
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66 <http-status code="503" text="Service Temporarily Unavailable"/>
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67 in reply to a request.
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68 For example, the directives
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69 <example>
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70 limit_conn_zone $binary_remote_addr zone=addr:10m;
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71
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72 server {
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73 location /download/ {
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74 limit_conn addr 1;
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75 }
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76 </example>
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77 allow for only a single connection at a time, per unique IP address.
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78 </para>
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79
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80 <para>
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81 When several <literal>limit_conn</literal> directives are specified,
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82 any configured limit will apply.
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83 For example, the following configuration will limit the number
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84 of connections to the server per client IP and at the same time
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85 will limit the total number of connections to the virtual host:
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86 <example>
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87 limit_conn_zone $binary_remote_addr zone=perip:10m;
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88 limit_conn_zone $server_name zone=perserver:10m;
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89
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90 server {
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91 ...
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92 limit_conn perip 10;
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93 limit_conn perserver 100;
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94 }
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95 </example>
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96
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97 </para>
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98
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99 <para>
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100 These directives are inherited from the previous level if and
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101 only if there are no
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102 <literal>limit_conn</literal>
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103 directives on the current level.
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104 </para>
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105
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106 </directive>
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107
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108
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109 <directive name="limit_conn_log_level">
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110 <syntax>
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111 <literal>info</literal> |
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112 <literal>notice</literal> |
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113 <literal>warn</literal> |
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114 <literal>error</literal></syntax>
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115 <default>error</default>
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116 <context>http</context>
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117 <context>server</context>
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118 <context>location</context>
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119 <appeared-in>0.8.18</appeared-in>
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120
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121 <para>
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122 Sets the desired logging level for cases when the server
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123 limits the number of connections.
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124 </para>
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125
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126 </directive>
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127
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128
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129 <directive name="limit_conn_zone">
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130 <syntax>
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131 <value>$variable</value>
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132 <literal>zone</literal>=<value>name</value>:<value>size</value></syntax>
179
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133 <default/>
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134 <context>http</context>
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135
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136 <para>
575
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137 Sets parameters of a shared memory zone that keeps states
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138 for various keys.
179
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139 This state stores the current number of connections in particular.
390
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140 The key is any non-empty value of the specified variable
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141 (empty values are not accounted).
179
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142 Example usage:
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143 <example>
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144 limit_conn_zone $binary_remote_addr zone=addr:10m;
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145 </example>
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146 Here, an IP address of the client serves as a key.
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147 Note that instead of <var>$remote_addr</var>, the
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148 <var>$binary_remote_addr</var> variable is used here.
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149 The length of the <var>$remote_addr</var> variable's value can
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150 range from 7 to 15 bytes, and the stored state occupies either
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151 32 or 64 bytes of memory on 32-bit platforms, and always 64
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152 bytes on 64-bit platforms.
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153 The length of the <var>$binary_remote_addr</var> variable's value
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154 is always 4 bytes, and the stored state always occupies 32 bytes
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155 on 32-bit platforms, and 64 bytes on 64-bit platforms.
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156 One megabyte zone can keep about 32 thousand 32-bit states,
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157 and about 16 thousand 64-byte states.
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158 If the storage for a zone is exhausted, the server will return error
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159 <http-status code="503" text="Service Temporarily Unavailable"/>
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160 to all further requests.
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161 </para>
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162
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163 </directive>
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164
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165
179
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166 <directive name="limit_zone">
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167 <syntax>
271
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168 <value>name</value>
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169 <value>$variable</value>
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170 <value>size</value></syntax>
179
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171 <default/>
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172 <context>http</context>
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173
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174 <para>
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175 This directive is made obsolete in version 1.1.8,
180
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176 an equivalent <link id="limit_conn_zone"/> directive
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177 with a changed syntax should be used instead:
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178 <note>
271
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179 <literal>limit_conn_zone</literal>
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180 <value>$variable</value>
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181 <literal>zone</literal>=<value>name</value>:<value>size</value>;
180
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182 </note>
179
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183 </para>
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184
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185 </directive>
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186
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187 </section>
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188
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189 </module>