Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_limit_req_module.xml @ 2462:63a2a3dc3d63
Documented the $limit_req_status variable.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Fri, 15 Nov 2019 15:52:43 +0300 |
parents | 384211f17f5a |
children | e4332b7580bb |
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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="13"> |
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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, | |
529
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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>] | |
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56 [<literal>nodelay</literal> | |
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57 <literal>delay</literal>=<value>number</value>]</syntax> |
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58 <default/> |
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59 <context>http</context> |
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60 <context>server</context> |
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61 <context>location</context> |
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62 |
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63 <para> |
966 | 64 Sets the shared memory zone |
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65 and the maximum burst size of requests. |
966 | 66 If the requests rate exceeds the rate configured for a zone, |
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67 their processing is delayed such that requests are processed |
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68 at a defined rate. |
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69 Excessive requests are delayed until their number exceeds the |
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70 maximum burst size |
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71 in which case the request is terminated with an |
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72 <link id="limit_req_status">error</link>. |
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73 By default, the maximum burst size is equal to zero. |
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74 For example, the directives |
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75 <example> |
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76 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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77 |
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78 server { |
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79 location /search/ { |
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80 limit_req zone=one burst=5; |
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81 } |
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82 </example> |
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83 allow not more than 1 request per second at an average, |
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84 with bursts not exceeding 5 requests. |
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85 </para> |
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86 |
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87 <para> |
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88 If delaying of excessive requests while requests are being limited is not |
271 | 89 desired, the parameter <literal>nodelay</literal> should be used: |
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90 <example> |
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91 limit_req zone=one burst=5 nodelay; |
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92 </example> |
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93 </para> |
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94 |
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95 <para id="limit_req_delay"> |
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96 The <literal>delay</literal> parameter (1.15.7) specifies a limit |
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97 at which excessive requests become delayed. |
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98 Default value is zero, i.e. all excessive requests are delayed. |
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99 </para> |
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100 |
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101 <para> |
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102 There could be several <literal>limit_req</literal> directives. |
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103 For example, the following configuration will limit the processing rate |
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104 of requests coming from a single IP address and, at the same time, |
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105 the request processing rate by the virtual server: |
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106 <example> |
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107 limit_req_zone $binary_remote_addr zone=perip:10m rate=1r/s; |
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108 limit_req_zone $server_name zone=perserver:10m rate=10r/s; |
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109 |
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110 server { |
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111 ... |
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112 limit_req zone=perip burst=5 nodelay; |
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113 limit_req zone=perserver burst=10; |
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114 } |
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115 </example> |
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116 |
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117 </para> |
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118 |
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119 <para> |
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120 These directives are inherited from the previous level if and |
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121 only if there are no |
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122 <literal>limit_req</literal> |
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123 directives on the current level. |
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124 </para> |
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125 |
179
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126 </directive> |
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127 |
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128 |
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129 <directive name="limit_req_dry_run"> |
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130 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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131 <default>off</default> |
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132 <context>http</context> |
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133 <context>server</context> |
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134 <context>location</context> |
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135 <appeared-in>1.17.1</appeared-in> |
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136 |
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137 <para> |
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138 Enables the dry run mode. |
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139 In this mode, requests processing rate is not limited, however, |
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140 in the shared memory zone, the number of excessive requests is accounted |
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141 as usual. |
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142 </para> |
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143 |
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144 </directive> |
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145 |
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146 |
179
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147 <directive name="limit_req_log_level"> |
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148 <syntax> |
271 | 149 <literal>info</literal> | |
150 <literal>notice</literal> | | |
151 <literal>warn</literal> | | |
152 <literal>error</literal></syntax> | |
179
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153 <default>error</default> |
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154 <context>http</context> |
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155 <context>server</context> |
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156 <context>location</context> |
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157 <appeared-in>0.8.18</appeared-in> |
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158 |
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159 <para> |
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160 Sets the desired logging level |
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161 for cases when the server refuses to process requests |
966 | 162 due to rate exceeding, |
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163 or delays request processing. |
966 | 164 Logging level for delays is one point less than for refusals; for example, |
271 | 165 if “<literal>limit_req_log_level notice</literal>” is specified, |
166 delays are logged with the <literal>info</literal> level. | |
179
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167 </para> |
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168 |
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169 </directive> |
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170 |
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171 |
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172 <directive name="limit_req_status"> |
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173 <syntax><value>code</value></syntax> |
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174 <default>503</default> |
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175 <context>http</context> |
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176 <context>server</context> |
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177 <context>location</context> |
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178 <appeared-in>1.3.15</appeared-in> |
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179 |
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180 <para> |
966 | 181 Sets the status code to return in response to rejected requests. |
870
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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 |
179
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187 <directive name="limit_req_zone"> |
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188 <syntax> |
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189 <value>key</value> |
271 | 190 <literal>zone</literal>=<value>name</value>:<value>size</value> |
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191 <literal>rate</literal>=<value>rate</value> |
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192 [<literal>sync</literal>]</syntax> |
179
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193 <default/> |
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194 <context>http</context> |
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195 |
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196 <para> |
966 | 197 Sets parameters for a shared memory zone |
198 that will keep states for various keys. | |
199 In particular, the state stores the current number of excessive requests. | |
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200 The <value>key</value> can contain text, variables, and their combination. |
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201 Requests with an empty key value are not accounted. |
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202 <note> |
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203 Prior to version 1.7.6, a <value>key</value> could contain exactly one variable. |
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204 </note> |
966 | 205 Usage example: |
179
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206 <example> |
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207 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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208 </example> |
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209 </para> |
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210 |
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211 <para> |
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212 Here, the states are kept in a 10 megabyte zone “one”, and an |
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213 average request processing rate for this zone cannot exceed |
179
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214 1 request per second. |
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215 </para> |
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216 |
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217 <para> |
966 | 218 A client IP address serves as a key. |
179
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219 Note that instead of <var>$remote_addr</var>, the |
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220 <var>$binary_remote_addr</var> variable is used here. |
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221 The <var>$binary_remote_addr</var> variable’s size |
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222 is always 4 bytes for IPv4 addresses or 16 bytes for IPv6 addresses. |
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223 The stored state always occupies |
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224 64 bytes on 32-bit platforms and 128 bytes on 64-bit platforms. |
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225 One megabyte zone can keep about 16 thousand 64-byte states |
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226 or about 8 thousand 128-byte states. |
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227 </para> |
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228 |
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229 <para> |
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230 If the zone storage is exhausted, the least recently used state is removed. |
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231 Even if after that a new state cannot be created, the request is terminated with |
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232 an <link id="limit_req_status">error</link>. |
179
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233 </para> |
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234 |
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235 <para> |
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236 The rate is specified in requests per second (r/s). |
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237 If a rate of less than one request per second is desired, |
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238 it is specified in request per minute (r/m). |
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239 For example, half-request per second is 30r/m. |
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240 </para> |
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241 |
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242 <para id="limit_req_zone_sync"> |
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243 The <literal>sync</literal> parameter (1.15.3) enables |
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244 <link doc="../stream/ngx_stream_zone_sync_module.xml" id="zone_sync">synchronization</link> |
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245 of the shared memory zone. |
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246 <note> |
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247 The <literal>sync</literal> parameter is available as part of our |
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248 <commercial_version>commercial subscription</commercial_version>. |
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249 </note> |
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250 </para> |
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251 |
179
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252 </directive> |
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253 |
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254 </section> |
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255 |
2462
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256 |
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257 <section id="variables" name="Embedded Variables"> |
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258 |
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259 <para> |
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260 <list type="tag"> |
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261 |
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262 <tag-name id="var_limit_req_status"><var>$limit_req_status</var></tag-name> |
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263 <tag-desc> |
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264 keeps the result of limiting the request processing rate (1.17.6): |
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265 <literal>PASSED</literal>, |
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266 <literal>DELAYED</literal>, |
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267 <literal>REJECTED</literal>, |
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268 <literal>DELAYED_DRY_RUN</literal>, or |
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269 <literal>REJECTED_DRY_RUN</literal> |
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270 </tag-desc> |
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271 |
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272 </list> |
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273 </para> |
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274 |
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275 </section> |
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276 |
179
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277 </module> |