Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 232:0c6773f751a2
Netcraft stats updated.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Sat, 10 Dec 2011 06:38:23 +0000 |
parents | bfe3eff81d04 |
children | b4afc16d1071 |
rev | line source |
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222
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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="Модуль ngx_http_limit_req_module" |
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6 link="/ru/docs/http/ngx_http_limit_req_module.html" |
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7 lang="ru"> |
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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 Модуль ngx_http_limit_req_module (0.7.21) позволяет ограничить число запросов |
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13 по заданному ключу или, как частный случай, число запросов с одного IP-адреса. |
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14 Ограничение делается с помощью метода “leaky bucket”. |
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15 </para> |
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16 |
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17 </section> |
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18 |
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19 <section name="Пример конфигурации" id="example"> |
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20 |
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21 <para> |
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22 <example> |
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23 http { |
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24 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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25 |
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26 ... |
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27 |
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28 server { |
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29 |
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30 ... |
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31 |
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32 location /search/ { |
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33 limit_req zone=one burst=5; |
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34 } |
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35 </example> |
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36 </para> |
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37 |
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38 </section> |
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39 |
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40 |
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41 <section name="Директивы" id="directives"> |
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42 |
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43 <directive name="limit_req"> |
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44 <syntax> |
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45 <parameter>zone</parameter>=<argument>название</argument> |
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46 [<parameter>burst</parameter>=<argument>число</argument>] |
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47 [<parameter>nodelay</parameter>] |
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48 </syntax> |
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49 <default/> |
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50 <context>http</context> |
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51 <context>server</context> |
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52 <context>location</context> |
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53 |
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54 <para> |
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55 Директива задаёт зону (zone) и максимально возможные всплески запросов (burst). |
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56 Если скорость запросов превышает описанную в зоне, |
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57 то их обработка задерживается так, чтобы запросы обрабатывались |
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58 с заданной скоростью. |
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59 Избыточные запросы задерживаются до тех пор, пока их число |
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60 не превысит заданное число всплесков. |
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61 В этом случае запрос завершается с ошибкой |
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62 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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63 По умолчанию число всплесков равно нулю. |
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64 Например, директивы |
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65 <example> |
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66 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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67 |
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68 server { |
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69 location /search/ { |
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70 limit_req zone=one burst=5; |
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71 } |
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72 |
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73 </example> |
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74 позволяют в среднем не более 1 запроса в секунду |
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75 со всплесками не более 5 запросов. |
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76 </para> |
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77 |
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78 <para> |
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79 Если же избыточные запросы в пределах лимита всплесков задерживать |
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80 не требуется, то следует использовать параметр <parameter>nodelay</parameter>: |
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81 <example> |
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82 limit_req zone=one burst=5 nodelay; |
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83 </example> |
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84 </para> |
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85 |
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86 </directive> |
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87 |
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88 |
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89 <directive name="limit_req_log_level"> |
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90 <syntax> |
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91 <value>info</value> | |
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92 <value>notice</value> | |
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93 <value>warn</value> | |
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94 <value>error</value> |
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95 </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 Директива задаёт желаемый уровень записи в лог случаев ограничения |
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104 числа запросов и задержек при обработке запроса. |
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105 Задержки записываются в лог с уровнем на единицу меньшим, чем ограничения, |
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106 например, если указано <command>limit_req_log_level notice</command>, |
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107 то задержки будут записываться в лог на уровне <value>info</value>. |
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108 </para> |
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109 |
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110 </directive> |
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111 |
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112 |
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113 <directive name="limit_req_zone"> |
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114 <syntax> |
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115 <argument>$переменная </argument> |
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116 <parameter>zone</parameter>=<argument>название</argument>:<argument>размер </argument> |
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117 <parameter>rate</parameter>=<argument>скорость</argument> |
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118 </syntax> |
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119 <default/> |
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120 <context>http</context> |
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121 |
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122 <para> |
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123 Директива задаёт параметры зоны, |
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124 которая хранит состояние для разных значений ключа. |
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125 Состояние в частности хранит текущее число запросов. |
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126 Ключом является значение заданной переменной. |
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127 Пример использования: |
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128 <example> |
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129 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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130 </example> |
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131 </para> |
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132 |
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133 <para> |
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134 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт, |
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135 и средняя скорость запросов для этой зоны не может превышать |
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136 1 запроса в секунду. |
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137 </para> |
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138 |
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139 <para> |
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140 В качестве ключа используется IP-адрес клиента. |
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141 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется |
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142 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить |
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143 размер состояния до 64 байт. |
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144 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний |
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145 размером 64 байта. |
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146 При переполнении зоны в ответ на последующие запросы сервер будет |
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147 возвращать ошибку |
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148 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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149 </para> |
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150 |
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151 <para> |
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152 Скорость задаётся в запросах в секунду (r/s). |
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153 Если же нужна скорость меньше одного запроса в секунду, |
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154 то она задаётся в запросах в минуту (r/m), например, |
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155 ползапроса в секунду — это 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> |