Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_limit_req_module.xml @ 1513:88d1a1d36c0c
Corrected link to the PROXY protocol specification.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 16 Jun 2015 16:36:53 +0300 |
parents | f15a983cac66 |
children | 7945dac7ad47 |
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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_req_module" |
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11 link="/en/docs/http/ngx_http_limit_req_module.html" |
589 | 12 lang="en" |
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13 rev="4"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
966 | 18 The <literal>ngx_http_limit_req_module</literal> module (0.7.21) is used |
19 to limit the request processing rate per a defined key, | |
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20 in particular, the processing rate of requests coming |
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21 from a single IP address. |
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22 The limitation is done using the “leaky bucket” method. |
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23 </para> |
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24 |
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25 </section> |
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26 |
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27 |
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28 <section id="example" name="Example Configuration"> |
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29 |
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30 <para> |
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31 <example> |
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32 http { |
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33 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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34 |
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35 ... |
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36 |
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37 server { |
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38 |
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39 ... |
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40 |
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41 location /search/ { |
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42 limit_req zone=one burst=5; |
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43 } |
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44 </example> |
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45 </para> |
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46 |
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47 </section> |
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48 |
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49 |
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50 <section id="directives" name="Directives"> |
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51 |
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52 <directive name="limit_req"> |
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53 <syntax> |
271 | 54 <literal>zone</literal>=<value>name</value> |
55 [<literal>burst</literal>=<value>number</value>] | |
56 [<literal>nodelay</literal>]</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> |
966 | 63 Sets the shared memory zone |
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64 and the maximum burst size of requests. |
966 | 65 If the requests rate exceeds the rate configured for a zone, |
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66 their processing is delayed such that requests are processed |
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67 at a defined rate. |
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68 Excessive requests are delayed until their number exceeds the |
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69 maximum burst size |
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70 in which case the request is terminated with an error |
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71 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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72 By default, the maximum burst size is equal to zero. |
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73 For example, the directives |
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74 <example> |
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75 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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76 |
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77 server { |
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78 location /search/ { |
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79 limit_req zone=one burst=5; |
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80 } |
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81 </example> |
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82 allow not more than 1 request per second at an average, |
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83 with bursts not exceeding 5 requests. |
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84 </para> |
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85 |
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86 <para> |
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87 If delaying of excessive requests while requests are being limited is not |
271 | 88 desired, the parameter <literal>nodelay</literal> should be used: |
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89 <example> |
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90 limit_req zone=one burst=5 nodelay; |
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91 </example> |
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92 </para> |
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93 |
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94 </directive> |
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95 |
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96 |
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97 <directive name="limit_req_log_level"> |
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98 <syntax> |
271 | 99 <literal>info</literal> | |
100 <literal>notice</literal> | | |
101 <literal>warn</literal> | | |
102 <literal>error</literal></syntax> | |
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103 <default>error</default> |
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104 <context>http</context> |
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105 <context>server</context> |
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106 <context>location</context> |
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107 <appeared-in>0.8.18</appeared-in> |
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108 |
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109 <para> |
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110 Sets the desired logging level |
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111 for cases when the server refuses to process requests |
966 | 112 due to rate exceeding, |
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113 or delays request processing. |
966 | 114 Logging level for delays is one point less than for refusals; for example, |
271 | 115 if “<literal>limit_req_log_level notice</literal>” is specified, |
116 delays are logged with the <literal>info</literal> level. | |
179
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117 </para> |
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118 |
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119 </directive> |
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120 |
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121 |
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122 <directive name="limit_req_status"> |
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123 <syntax><value>code</value></syntax> |
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124 <default>503</default> |
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125 <context>http</context> |
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126 <context>server</context> |
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127 <context>location</context> |
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128 <appeared-in>1.3.15</appeared-in> |
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129 |
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130 <para> |
966 | 131 Sets the status code to return in response to rejected requests. |
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132 </para> |
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133 |
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134 </directive> |
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135 |
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136 |
179
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137 <directive name="limit_req_zone"> |
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138 <syntax> |
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139 <value>key</value> |
271 | 140 <literal>zone</literal>=<value>name</value>:<value>size</value> |
141 <literal>rate</literal>=<value>rate</value></syntax> | |
179
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142 <default/> |
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143 <context>http</context> |
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144 |
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145 <para> |
966 | 146 Sets parameters for a shared memory zone |
147 that will keep states for various keys. | |
148 In particular, the state stores the current number of excessive requests. | |
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149 The <value>key</value> can contain text, variables, and their combination. |
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150 Requests with an empty key value are not accounted. |
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151 <note> |
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152 Prior to version 1.7.6, a <value>key</value> could contain exactly one variable. |
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153 </note> |
966 | 154 Usage example: |
179
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155 <example> |
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156 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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157 </example> |
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158 </para> |
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159 |
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160 <para> |
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161 Here, the states are kept in a 10 megabyte zone “one”, and an |
529
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162 average request processing rate for this zone cannot exceed |
179
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163 1 request per second. |
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164 </para> |
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165 |
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166 <para> |
966 | 167 A client IP address serves as a key. |
179
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168 Note that instead of <var>$remote_addr</var>, the |
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169 <var>$binary_remote_addr</var> variable is used here, |
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170 that allows decreasing the state size down to 64 bytes. |
179
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171 One megabyte zone can keep about 16 thousand 64-byte states. |
966 | 172 If the zone storage is exhausted, the server will return the |
179
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173 <http-status code="503" text="Service Temporarily Unavailable"/> |
966 | 174 error to all further requests. |
179
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175 </para> |
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176 |
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177 <para> |
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178 The rate is specified in requests per second (r/s). |
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179 If a rate of less than one request per second is desired, |
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180 it is specified in request per minute (r/m). |
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181 For example, half-request per second is 30r/m. |
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182 </para> |
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183 |
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184 </directive> |
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185 |
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186 </section> |
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187 |
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188 </module> |