Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 355:5d731825a6c2
Regenerated.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Wed, 25 Jan 2012 13:34:17 +0000 |
parents | a4fa80755eab |
children | bb51d3e17dd0 |
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> |
271 | 12 Модуль <literal>ngx_http_limit_req_module</literal> (0.7.21) позволяет |
243 | 13 ограничить число запросов |
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14 по заданному ключу или, как частный случай, число запросов с одного IP-адреса. |
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15 Ограничение делается с помощью метода “leaky bucket”. |
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16 </para> |
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17 |
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18 </section> |
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19 |
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20 <section name="Пример конфигурации" id="example"> |
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21 |
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22 <para> |
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23 <example> |
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24 http { |
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25 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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26 |
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27 ... |
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28 |
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29 server { |
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30 |
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31 ... |
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32 |
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33 location /search/ { |
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34 limit_req zone=one burst=5; |
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35 } |
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36 </example> |
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37 </para> |
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38 |
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39 </section> |
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40 |
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41 |
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42 <section name="Директивы" id="directives"> |
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43 |
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44 <directive name="limit_req"> |
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45 <syntax> |
271 | 46 <literal>zone</literal>=<value>название</value> |
47 [<literal>burst</literal>=<value>число</value>] | |
48 [<literal>nodelay</literal>]</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 </example> |
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73 позволяют в среднем не более 1 запроса в секунду |
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74 со всплесками не более 5 запросов. |
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75 </para> |
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76 |
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77 <para> |
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78 Если же избыточные запросы в пределах лимита всплесков задерживать |
271 | 79 не требуется, то следует использовать параметр <literal>nodelay</literal>: |
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80 <example> |
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81 limit_req zone=one burst=5 nodelay; |
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82 </example> |
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83 </para> |
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84 |
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85 </directive> |
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86 |
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87 |
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88 <directive name="limit_req_log_level"> |
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89 <syntax> |
271 | 90 <literal>info</literal> | |
91 <literal>notice</literal> | | |
92 <literal>warn</literal> | | |
93 <literal>error</literal></syntax> | |
102
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94 <default>error</default> |
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95 <context>http</context> |
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96 <context>server</context> |
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97 <context>location</context> |
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98 <appeared-in>0.8.18</appeared-in> |
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99 |
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100 <para> |
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101 Директива задаёт желаемый уровень записи в лог случаев ограничения |
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102 числа запросов и задержек при обработке запроса. |
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103 Задержки записываются в лог с уровнем на единицу меньшим, чем ограничения, |
271 | 104 например, если указано “<literal>limit_req_log_level notice</literal>”, |
105 то задержки будут записываться в лог на уровне <literal>info</literal>. | |
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106 </para> |
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107 |
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108 </directive> |
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109 |
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110 |
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111 <directive name="limit_req_zone"> |
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112 <syntax> |
271 | 113 <value>$переменная</value> |
114 <literal>zone</literal>=<value>название</value>:<value>размер</value> | |
115 <literal>rate</literal>=<value>скорость</value></syntax> | |
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116 <default/> |
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117 <context>http</context> |
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118 |
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119 <para> |
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120 Директива задаёт параметры зоны, |
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121 которая хранит состояние для разных значений ключа. |
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122 Состояние в частности хранит текущее число запросов. |
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123 Ключом является значение заданной переменной. |
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124 Пример использования: |
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125 <example> |
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126 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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127 </example> |
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128 </para> |
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129 |
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130 <para> |
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131 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт, |
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132 и средняя скорость запросов для этой зоны не может превышать |
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133 1 запроса в секунду. |
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134 </para> |
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135 |
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136 <para> |
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137 В качестве ключа используется IP-адрес клиента. |
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138 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется |
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139 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить |
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140 размер состояния до 64 байт. |
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141 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний |
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142 размером 64 байта. |
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143 При переполнении зоны в ответ на последующие запросы сервер будет |
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144 возвращать ошибку |
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145 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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146 </para> |
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147 |
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148 <para> |
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149 Скорость задаётся в запросах в секунду (r/s). |
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150 Если же нужна скорость меньше одного запроса в секунду, |
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151 то она задаётся в запросах в минуту (r/m), например, |
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152 ползапроса в секунду — это 30r/m. |
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153 </para> |
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154 |
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155 </directive> |
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156 |
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157 </section> |
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158 |
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159 </module> |