Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_limit_conn_module.xml @ 519:e23d718ac865
A link to CHANGES for 1.3 corrected.
author | Maxim Konovalov <maxim@nginx.com> |
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date | Mon, 21 May 2012 15:15:17 +0000 |
parents | bef9e1a2e3c8 |
children | ebcb351d9eb3 |
rev | line source |
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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> |
271 | 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"> |
271 | 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> |
271 | 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 |
271 | 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> |
271 | 105 <literal>info</literal> | |
106 <literal>notice</literal> | | |
107 <literal>warn</literal> | | |
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> |
271 | 125 <value>$variable</value> |
126 <literal>zone</literal>=<value>name</value>:<value>size</value></syntax> | |
179
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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 any non-empty value of the specified variable |
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134 (empty values are not accounted). |
179
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135 Example usage: |
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136 <example> |
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137 limit_conn_zone $binary_remote_addr zone=addr:10m; |
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138 </example> |
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139 Here, an IP address of the client serves as a key. |
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140 Note that instead of <var>$remote_addr</var>, the |
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141 <var>$binary_remote_addr</var> variable is used here. |
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142 The length of the <var>$remote_addr</var> variable's value can |
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143 range from 7 to 15 bytes, and the stored state occupies either |
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144 32 or 64 bytes of memory on 32-bit platforms, and always 64 |
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145 bytes on 64-bit platforms. |
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146 The length of the <var>$binary_remote_addr</var> variable's value |
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147 is always 4 bytes, and the stored state always occupies 32 bytes |
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148 on 32-bit platforms, and 64 bytes on 64-bit platforms. |
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149 One megabyte zone can keep about 32 thousand 32-bit states, |
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150 and about 16 thousand 64-byte states. |
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151 If the storage for a zone is exhausted, the server will return error |
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152 <http-status code="503" text="Service Temporarily Unavailable"/> |
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153 to all further requests. |
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154 </para> |
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155 |
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156 </directive> |
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157 |
364 | 158 |
179
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159 <directive name="limit_zone"> |
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160 <syntax> |
271 | 161 <value>name</value> |
162 <value>$variable</value> | |
163 <value>size</value></syntax> | |
179
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164 <default/> |
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165 <context>http</context> |
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166 |
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167 <para> |
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168 This directive is made obsolete in version 1.1.8, |
180
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169 an equivalent <link id="limit_conn_zone"/> directive |
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170 with a changed syntax should be used instead: |
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171 <note> |
271 | 172 <literal>limit_conn_zone</literal> |
173 <value>$variable</value> | |
174 <literal>zone</literal>=<value>name</value>:<value>size</value>; | |
180
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175 </note> |
179
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176 </para> |
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177 |
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178 </directive> |
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179 |
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180 </section> |
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181 |
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182 </module> |