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annotate xml/en/docs/http/ngx_http_limit_req_module.xml @ 529:d477ae38c0bd

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Clarified on what this module actually limits.
author Ruslan Ermilov <ru@nginx.com>
date Wed, 06 Jun 2012 14:17:28 +0000
parents 0e55c9a48da9
children ebcb351d9eb3
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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_req_module"
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6 link="/en/docs/http/ngx_http_limit_req_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 <literal>ngx_http_limit_req_module</literal> module (0.7.21) allows
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13 to limit the request processing rate per defined key,
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14 in particular, the processing rate of requests coming
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15 from a single IP address.
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16 The limitation is done using the “leaky bucket” method.
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17 </para>
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18
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19 </section>
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20
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21
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22 <section id="example" name="Example Configuration">
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23
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24 <para>
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25 <example>
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26 http {
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27 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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28
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29 ...
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30
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31 server {
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32
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33 ...
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34
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35 location /search/ {
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36 limit_req zone=one burst=5;
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37 }
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38 </example>
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="directives" name="Directives">
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45
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46 <directive name="limit_req">
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47 <syntax>
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48 <literal>zone</literal>=<value>name</value>
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49 [<literal>burst</literal>=<value>number</value>]
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50 [<literal>nodelay</literal>]</syntax>
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51 <default/>
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52 <context>http</context>
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53 <context>server</context>
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54 <context>location</context>
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55
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56 <para>
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57 Sets a zone and the maximum allowed burst of requests.
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58 If the rate of requests exceeds the rate configured for a zone,
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59 request processing is delayed such as that they are processed
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60 at a defined rate.
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61 Excessive requests are delayed until their number exceeds the
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62 defined number of bursts.
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63 When exceeded, the request is terminated with an error
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64 <http-status code="503" text="Service Temporarily Unavailable"/>.
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65 By default, the number of bursts is equal to zero.
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66 For example, the directives
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67 <example>
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68 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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69
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70 server {
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71 location /search/ {
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72 limit_req zone=one burst=5;
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73 }
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74 </example>
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75 allow not more than 1 request per second at an average,
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76 with bursts not exceeding 5 requests.
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77 </para>
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78
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79 <para>
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80 If delaying of excessive requests while requests are being limited is not
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81 desired, the parameter <literal>nodelay</literal> should be used:
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82 <example>
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83 limit_req zone=one burst=5 nodelay;
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84 </example>
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85 </para>
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86
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87 </directive>
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90 <directive name="limit_req_log_level">
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91 <syntax>
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92 <literal>info</literal> |
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93 <literal>notice</literal> |
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94 <literal>warn</literal> |
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95 <literal>error</literal></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
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104 for cases when the server refuses to process requests
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105 due to rate being exceeded,
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106 or delays request processing.
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107 Delays are logged with the level one less than refusals; for example,
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108 if “<literal>limit_req_log_level notice</literal>” is specified,
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109 delays are logged with the <literal>info</literal> level.
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110 </para>
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111
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112 </directive>
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113
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115 <directive name="limit_req_zone">
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116 <syntax>
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117 <value>$variable</value>
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118 <literal>zone</literal>=<value>name</value>:<value>size</value>
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119 <literal>rate</literal>=<value>rate</value></syntax>
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120 <default/>
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121 <context>http</context>
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122
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123 <para>
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124 Sets the parameters for a zone that keeps states for various keys.
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125 The state stores the current number of excessive requests in particular.
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126 The key is any non-empty value of the specified variable
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127 (empty values are not accounted).
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128 Example usage:
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129 <example>
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130 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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131 </example>
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132 </para>
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133
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134 <para>
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135 Here, the states are kept in a 10 megabyte zone “one”, and an
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136 average request processing rate for this zone cannot exceed
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137 1 request per second.
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138 </para>
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139
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140 <para>
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141 An IP address of the client serves as a key.
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142 Note that instead of <var>$remote_addr</var>, the
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143 <var>$binary_remote_addr</var> variable is used here,
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144 allowing to lower the size of a state down to 64 bytes.
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145 One megabyte zone can keep about 16 thousand 64-byte states.
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146 If the storage for a zone is exhausted, the server will return error
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147 <http-status code="503" text="Service Temporarily Unavailable"/>
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148 to all further requests.
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149 </para>
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150
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151 <para>
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152 The rate is specified in requests per second (r/s).
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153 If a rate of less than one request per second is desired,
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154 it is specified in request per minute (r/m).
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155 For example, half-request per second is 30r/m.
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156 </para>
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157
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158 </directive>
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159
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160 </section>
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161
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162 </module>