Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 364:bb51d3e17dd0
Style fixed.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Fri, 27 Jan 2012 10:39:12 +0000 |
parents | a4fa80755eab |
children | f4033b9bc4ec |
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 |
364 | 20 |
21 <section id="example" name="Пример конфигурации"> | |
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22 |
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23 <para> |
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24 <example> |
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25 http { |
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26 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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27 |
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28 ... |
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29 |
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30 server { |
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31 |
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32 ... |
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33 |
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34 location /search/ { |
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35 limit_req zone=one burst=5; |
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36 } |
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37 </example> |
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38 </para> |
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39 |
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40 </section> |
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41 |
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42 |
364 | 43 <section id="directives" name="Директивы"> |
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44 |
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45 <directive name="limit_req"> |
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46 <syntax> |
271 | 47 <literal>zone</literal>=<value>название</value> |
48 [<literal>burst</literal>=<value>число</value>] | |
49 [<literal>nodelay</literal>]</syntax> | |
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50 <default/> |
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51 <context>http</context> |
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52 <context>server</context> |
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53 <context>location</context> |
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54 |
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55 <para> |
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56 Директива задаёт зону (zone) и максимально возможные всплески запросов (burst). |
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57 Если скорость запросов превышает описанную в зоне, |
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58 то их обработка задерживается так, чтобы запросы обрабатывались |
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59 с заданной скоростью. |
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60 Избыточные запросы задерживаются до тех пор, пока их число |
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61 не превысит заданное число всплесков. |
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62 В этом случае запрос завершается с ошибкой |
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63 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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64 По умолчанию число всплесков равно нулю. |
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65 Например, директивы |
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66 <example> |
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67 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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68 |
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69 server { |
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70 location /search/ { |
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71 limit_req zone=one burst=5; |
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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 |
271 | 80 не требуется, то следует использовать параметр <literal>nodelay</literal>: |
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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> |
271 | 91 <literal>info</literal> | |
92 <literal>notice</literal> | | |
93 <literal>warn</literal> | | |
94 <literal>error</literal></syntax> | |
102
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95 <default>error</default> |
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96 <context>http</context> |
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97 <context>server</context> |
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98 <context>location</context> |
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99 <appeared-in>0.8.18</appeared-in> |
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100 |
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101 <para> |
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102 Директива задаёт желаемый уровень записи в лог случаев ограничения |
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103 числа запросов и задержек при обработке запроса. |
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104 Задержки записываются в лог с уровнем на единицу меньшим, чем ограничения, |
271 | 105 например, если указано “<literal>limit_req_log_level notice</literal>”, |
106 то задержки будут записываться в лог на уровне <literal>info</literal>. | |
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107 </para> |
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108 |
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109 </directive> |
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110 |
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111 |
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112 <directive name="limit_req_zone"> |
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113 <syntax> |
271 | 114 <value>$переменная</value> |
115 <literal>zone</literal>=<value>название</value>:<value>размер</value> | |
116 <literal>rate</literal>=<value>скорость</value></syntax> | |
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117 <default/> |
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118 <context>http</context> |
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119 |
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120 <para> |
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121 Директива задаёт параметры зоны, |
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122 которая хранит состояние для разных значений ключа. |
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123 Состояние в частности хранит текущее число запросов. |
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124 Ключом является значение заданной переменной. |
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125 Пример использования: |
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126 <example> |
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127 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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128 </example> |
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129 </para> |
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130 |
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131 <para> |
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132 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт, |
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133 и средняя скорость запросов для этой зоны не может превышать |
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134 1 запроса в секунду. |
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135 </para> |
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136 |
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137 <para> |
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138 В качестве ключа используется IP-адрес клиента. |
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139 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется |
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140 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить |
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141 размер состояния до 64 байт. |
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142 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний |
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143 размером 64 байта. |
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144 При переполнении зоны в ответ на последующие запросы сервер будет |
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145 возвращать ошибку |
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146 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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147 </para> |
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148 |
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149 <para> |
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150 Скорость задаётся в запросах в секунду (r/s). |
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151 Если же нужна скорость меньше одного запроса в секунду, |
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152 то она задаётся в запросах в минуту (r/m), например, |
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153 ползапроса в секунду — это 30r/m. |
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154 </para> |
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155 |
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156 </directive> |
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157 |
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158 </section> |
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159 |
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160 </module> |