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annotate xml/en/docs/http/ngx_http_limit_conn_module.xml @ 364:bb51d3e17dd0

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Style fixed.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 27 Jan 2012 10:39:12 +0000
parents a4fa80755eab
children bef9e1a2e3c8
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1 <?xml version="1.0"?>
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2
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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4
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5 <module name="Module ngx_http_limit_conn_module"
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6 link="/en/docs/http/ngx_http_limit_conn_module.html"
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7 lang="en">
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8
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9 <section id="summary">
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10
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11 <para>
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12 The <literal>ngx_http_limit_conn_module</literal> module allows
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13 to limit the number of connections per defined key, in
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14 particular, the number of connections from a single IP address.
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15 </para>
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16
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17 <para>
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18 Not all connections are counted; only those that have requests
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19 currently being processed by the server, in which request header has
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20 been fully read.
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21 </para>
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22
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23 </section>
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24
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25
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26 <section id="example" name="Example Configuration">
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27
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28 <para>
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29 <example>
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30 http {
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31 limit_conn_zone $binary_remote_addr zone=addr:10m;
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32
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33 ...
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34
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35 server {
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36
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37 ...
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38
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39 location /download/ {
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40 limit_conn addr 1;
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41 }
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42 </example>
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43 </para>
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44
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45 </section>
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46
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47
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48 <section id="directives" name="Directives">
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49
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50 <directive name="limit_conn">
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51 <syntax><value>zone</value> <value>number</value></syntax>
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52 <default/>
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53 <context>http</context>
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54 <context>server</context>
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55 <context>location</context>
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56
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57 <para>
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58 Sets the maximum allowed number of connections for a given key value.
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59 When this limit is exceeded, the server will return error
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60 <http-status code="503" text="Service Temporarily Unavailable"/>
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61 in reply to a request.
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62 For example, the directives
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63 <example>
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64 limit_conn_zone $binary_remote_addr zone=addr:10m;
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65
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66 server {
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67 location /download/ {
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68 limit_conn addr 1;
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69 }
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70 </example>
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71 allow for only a single connection at a time, per unique IP address.
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72 </para>
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73
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74 <para>
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75 When several <literal>limit_conn</literal> directives are specified,
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76 any configured limit will apply.
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77 For example, the following configuration will limit the number
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78 of connections to the server per client IP and at the same time
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79 will limit the total number of connections to the virtual host:
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80 <example>
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81 limit_conn_zone $binary_remote_addr zone=perip:10m;
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82 limit_conn_zone $server_name zone=perserver:10m;
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83
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84 server {
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85 ...
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86 limit_conn perip 10;
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87 limit_conn perserver 100;
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88 }
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89 </example>
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90
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91 </para>
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92
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93 <para>
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94 These directives are inherited from the previous level if and
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95 only if there are no
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96 <literal>limit_conn</literal>
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97 directives on the current level.
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98 </para>
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99
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100 </directive>
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101
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102
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103 <directive name="limit_conn_log_level">
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104 <syntax>
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105 <literal>info</literal> |
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106 <literal>notice</literal> |
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107 <literal>warn</literal> |
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108 <literal>error</literal></syntax>
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109 <default>error</default>
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110 <context>http</context>
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111 <context>server</context>
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112 <context>location</context>
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113 <appeared-in>0.8.18</appeared-in>
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114
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115 <para>
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116 Sets the desired logging level for cases when the server
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117 limits the number of connections.
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118 </para>
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119
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120 </directive>
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121
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122
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123 <directive name="limit_conn_zone">
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124 <syntax>
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125 <value>$variable</value>
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126 <literal>zone</literal>=<value>name</value>:<value>size</value></syntax>
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127 <default/>
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128 <context>http</context>
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129
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130 <para>
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131 Sets the parameters for a zone that keeps states for various keys.
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132 This state stores the current number of connections in particular.
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133 The key is the value of the specified variable.
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134 Example usage:
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135 <example>
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136 limit_conn_zone $binary_remote_addr zone=addr:10m;
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137 </example>
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138 Here, an IP address of the client serves as a key.
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139 Note that instead of <var>$remote_addr</var>, the
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140 <var>$binary_remote_addr</var> variable is used here.
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141 The length of the <var>$remote_addr</var> variable's value can
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142 range from 7 to 15 bytes, and the stored state occupies either
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143 32 or 64 bytes of memory on 32-bit platforms, and always 64
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144 bytes on 64-bit platforms.
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145 The length of the <var>$binary_remote_addr</var> variable's value
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146 is always 4 bytes, and the stored state always occupies 32 bytes
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147 on 32-bit platforms, and 64 bytes on 64-bit platforms.
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148 One megabyte zone can keep about 32 thousand 32-bit states,
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149 and about 16 thousand 64-byte states.
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150 If the storage for a zone is exhausted, the server will return error
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151 <http-status code="503" text="Service Temporarily Unavailable"/>
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152 to all further requests.
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153 </para>
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154
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155 </directive>
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156
364
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157
179
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158 <directive name="limit_zone">
270
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159 <syntax>
271
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160 <value>name</value>
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161 <value>$variable</value>
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162 <value>size</value></syntax>
179
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163 <default/>
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164 <context>http</context>
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165
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166 <para>
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167 This directive is made obsolete in version 1.1.8,
180
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168 an equivalent <link id="limit_conn_zone"/> directive
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169 with a changed syntax should be used instead:
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170 <note>
271
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171 <literal>limit_conn_zone</literal>
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172 <value>$variable</value>
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173 <literal>zone</literal>=<value>name</value>:<value>size</value>;
180
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174 </note>
179
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175 </para>
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176
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177 </directive>
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178
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179 </section>
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180
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181 </module>