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annotate xml/en/docs/http/ngx_http_limit_conn_module.xml @ 180:9e7d0c9c7eaa

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Mentioned the compatible "limit_conn_zone" directive syntax for the older "limit_zone" directive.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 15 Nov 2011 07:34:43 +0000
parents 8cc01e2179a9
children 2df68271c898
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179
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1 <?xml version="1.0" encoding="utf-8"?>
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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 <code>ngx_http_limit_conn_module</code> 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><argument>zone number</argument></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 <code>limit_conn</code> directives are specified,
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76 any configured limit will apply.
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77 </para>
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78
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79 <para>
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80 These directives are inherited from the previous level if and
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81 only if there are no
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82 <code>limit_conn</code>
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83 directives on the current level.
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84 </para>
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85
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86 </directive>
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87
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88
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89 <directive name="limit_conn_log_level">
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90 <syntax>
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91 <value>info</value> |
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92 <value>notice</value> |
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93 <value>warn</value> |
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94 <value>error</value>
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95 </syntax>
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96 <default>error</default>
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97 <context>http</context>
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98 <context>server</context>
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99 <context>location</context>
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100 <appeared-in>0.8.18</appeared-in>
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101
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102 <para>
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103 Sets the desired logging level for cases when the server
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104 limits the number of connections.
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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_zone">
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111 <syntax>
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112 <argument>$variable </argument>
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113 <parameter>zone</parameter>=<argument>name</argument>:<argument>size</argument>
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114 </syntax>
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115 <default/>
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116 <context>http</context>
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117
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118 <para>
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119 Sets the parameters for a zone that keeps states for various keys.
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120 This state stores the current number of connections in particular.
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121 The key is the value of the specified variable.
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122 Example usage:
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123 <example>
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124 limit_conn_zone $binary_remote_addr zone=addr:10m;
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125 </example>
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126 Here, an IP address of the client serves as a key.
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127 Note that instead of <var>$remote_addr</var>, the
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128 <var>$binary_remote_addr</var> variable is used here.
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129 The length of the <var>$remote_addr</var> variable's value can
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130 range from 7 to 15 bytes, and the stored state occupies either
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131 32 or 64 bytes of memory on 32-bit platforms, and always 64
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132 bytes on 64-bit platforms.
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133 The length of the <var>$binary_remote_addr</var> variable's value
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134 is always 4 bytes, and the stored state always occupies 32 bytes
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135 on 32-bit platforms, and 64 bytes on 64-bit platforms.
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136 One megabyte zone can keep about 32 thousand 32-bit states,
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137 and about 16 thousand 64-byte states.
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138 If the storage for a zone is exhausted, the server will return error
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139 <http-status code="503" text="Service Temporarily Unavailable"/>
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140 to all further requests.
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141 </para>
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142
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143 </directive>
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144
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145 <directive name="limit_zone">
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146 <syntax><argument>$variable name size</argument></syntax>
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147 <default/>
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148 <context>http</context>
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149
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150 <para>
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151 This directive is made obsolete in version 1.1.8,
180
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152 an equivalent <link id="limit_conn_zone"/> directive
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153 with a changed syntax should be used instead:
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154 <note>
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155 <code>limit_conn_zone </code>
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156 <argument>$variable </argument>
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157 <parameter>zone</parameter>=<argument>name</argument>:<argument>size</argument>;
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158 </note>
179
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159 </para>
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160
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161 </directive>
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162
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163 </section>
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164
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165 </module>