Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_limit_req_module.xml @ 580:be54c443235a
Added copyright markers to documentation sources.
author | Ruslan Ermilov <ru@nginx.com> |
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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 |
580
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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_req_module" |
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11 link="/en/docs/http/ngx_http_limit_req_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> |
271 | 17 The <literal>ngx_http_limit_req_module</literal> module (0.7.21) allows |
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18 to limit the request processing rate per defined key, |
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19 in particular, the processing rate of requests coming |
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20 from a single IP address. |
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21 The limitation is done using the “leaky bucket” method. |
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22 </para> |
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23 |
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24 </section> |
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25 |
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26 |
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27 <section id="example" name="Example Configuration"> |
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28 |
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29 <para> |
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30 <example> |
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31 http { |
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32 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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33 |
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34 ... |
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35 |
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36 server { |
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37 |
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38 ... |
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39 |
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40 location /search/ { |
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41 limit_req zone=one burst=5; |
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42 } |
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43 </example> |
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44 </para> |
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45 |
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46 </section> |
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47 |
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48 |
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49 <section id="directives" name="Directives"> |
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50 |
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51 <directive name="limit_req"> |
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52 <syntax> |
271 | 53 <literal>zone</literal>=<value>name</value> |
54 [<literal>burst</literal>=<value>number</value>] | |
55 [<literal>nodelay</literal>]</syntax> | |
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56 <default/> |
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57 <context>http</context> |
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58 <context>server</context> |
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59 <context>location</context> |
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60 |
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61 <para> |
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62 Sets a shared memory zone |
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63 and the maximum allowed burst of requests. |
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64 If the rate of requests exceeds the rate configured for a zone, |
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65 request processing is delayed such as that they are processed |
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66 at a defined rate. |
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67 Excessive requests are delayed until their number exceeds the |
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68 defined number of bursts. |
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69 When exceeded, the request is terminated with an error |
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70 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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71 By default, the number of bursts is equal to zero. |
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72 For example, the directives |
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73 <example> |
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74 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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75 |
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76 server { |
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77 location /search/ { |
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78 limit_req zone=one burst=5; |
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79 } |
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80 </example> |
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81 allow not more than 1 request per second at an average, |
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82 with bursts not exceeding 5 requests. |
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83 </para> |
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84 |
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85 <para> |
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86 If delaying of excessive requests while requests are being limited is not |
271 | 87 desired, the parameter <literal>nodelay</literal> should be used: |
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88 <example> |
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89 limit_req zone=one burst=5 nodelay; |
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90 </example> |
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91 </para> |
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92 |
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93 </directive> |
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94 |
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95 |
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96 <directive name="limit_req_log_level"> |
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97 <syntax> |
271 | 98 <literal>info</literal> | |
99 <literal>notice</literal> | | |
100 <literal>warn</literal> | | |
101 <literal>error</literal></syntax> | |
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102 <default>error</default> |
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103 <context>http</context> |
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104 <context>server</context> |
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105 <context>location</context> |
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106 <appeared-in>0.8.18</appeared-in> |
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107 |
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108 <para> |
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109 Sets the desired logging level |
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110 for cases when the server refuses to process requests |
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111 due to rate being exceeded, |
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112 or delays request processing. |
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113 Delays are logged with the level one less than refusals; for example, |
271 | 114 if “<literal>limit_req_log_level notice</literal>” is specified, |
115 delays are logged with the <literal>info</literal> level. | |
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116 </para> |
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117 |
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118 </directive> |
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119 |
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120 |
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121 <directive name="limit_req_zone"> |
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122 <syntax> |
271 | 123 <value>$variable</value> |
124 <literal>zone</literal>=<value>name</value>:<value>size</value> | |
125 <literal>rate</literal>=<value>rate</value></syntax> | |
179
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126 <default/> |
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127 <context>http</context> |
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128 |
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129 <para> |
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130 Sets parameters of a shared memory zone |
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131 that keeps states for various keys. |
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132 The state stores the current number of excessive requests in particular. |
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133 The key is any non-empty value of the specified variable |
509 | 134 (empty values are not accounted). |
288 | 135 Example usage: |
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136 <example> |
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137 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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138 </example> |
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139 </para> |
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140 |
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141 <para> |
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142 Here, the states are kept in a 10 megabyte zone “one”, and an |
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143 average request processing rate for this zone cannot exceed |
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144 1 request per second. |
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145 </para> |
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146 |
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147 <para> |
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148 An IP address of the client serves as a key. |
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149 Note that instead of <var>$remote_addr</var>, the |
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150 <var>$binary_remote_addr</var> variable is used here, |
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151 allowing to lower the size of a state down to 64 bytes. |
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152 One megabyte zone can keep about 16 thousand 64-byte states. |
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153 If the storage for a zone is exhausted, the server will return error |
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154 <http-status code="503" text="Service Temporarily Unavailable"/> |
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155 to all further requests. |
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156 </para> |
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157 |
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158 <para> |
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159 The rate is specified in requests per second (r/s). |
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160 If a rate of less than one request per second is desired, |
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161 it is specified in request per minute (r/m). |
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162 For example, half-request per second is 30r/m. |
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163 </para> |
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164 |
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165 </directive> |
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166 |
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167 </section> |
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168 |
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169 </module> |