annotate xml/cn/docs/http/ngx_http_limit_conn_module.xml @ 1017:9f9a427a73eb

Fixed broken links to chinese versions of some modules. The chinese version contains untranslated copies of english documentation for random_index and realip modules. The result is the appearance of 'translation to chinese' link for this modules pointing to non-existing document. This files are removed. Also, broken links are generated for the chinese version of the "flv" module, but the translation exists, although not enabled for publication. Since contents of file looks like a valid translation, it is allowed to be published.
author Vladimir Homutov <vl@nginx.com>
date Mon, 18 Nov 2013 12:48:10 +0400
parents 9934338f83af
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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="ngx_http_limit_conn_module 模块"
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11 link="/cn/docs/http/ngx_http_limit_conn_module.html"
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12 lang="cn"
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13 translator="G_will"
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14 rev="1">
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15
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16 <section id="summary">
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17
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18 <para>
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19 <literal>ngx_http_limit_conn_module</literal> 模块可以按照定义的键限定每个键值的连接数。特别的,可以设定单一 IP 来源的连接数。
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20 </para>
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21
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22 <para>
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23 并不是所有的连接都会被模块计数;只有那些正在被处理的请求(这些请求的头信息已被完全读入)所在的连接才会被计数。
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24 </para>
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25
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26 </section>
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27
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28
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29 <section id="example" name="配置范例">
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30
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31 <para>
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32 <example>
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33 http {
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34 limit_conn_zone $binary_remote_addr zone=addr:10m;
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35
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36 ...
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37
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38 server {
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39
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40 ...
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41
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42 location /download/ {
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43 limit_conn addr 1;
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44 }
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45 </example>
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46 </para>
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47
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48 </section>
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49
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50
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51 <section id="directives" name="指令">
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52
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53 <directive name="limit_conn">
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54 <syntax><value>zone</value> <value>number</value></syntax>
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55 <default/>
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56 <context>http</context>
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57 <context>server</context>
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58 <context>location</context>
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59
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60 <para>
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61 指定一块已经设定的共享内存空间,以及每个给定键值的最大连接数。当连接数超过最大连接数时,服务器将会返回
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62 <http-status code="503" text="Service Temporarily Unavailable"/>
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63 错误。比如,如下配置
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64 <example>
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65 limit_conn_zone $binary_remote_addr zone=addr:10m;
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66
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67 server {
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68 location /download/ {
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69 limit_conn addr 1;
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70 }
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71 </example>
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72 表示,同一 IP 同一时间只允许有一个连接。
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73 </para>
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74
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75 <para>
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76 当多个 <literal>limit_conn</literal> 指令被配置时,所有的连接数限制都会生效。比如,下面配置不仅会限制单一IP来源的连接数,同时也会限制单一虚拟服务器的总连接数:
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77 <example>
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78 limit_conn_zone $binary_remote_addr zone=perip:10m;
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79 limit_conn_zone $server_name zone=perserver:10m;
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80
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81 server {
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82 ...
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83 limit_conn perip 10;
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84 limit_conn perserver 100;
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85 }
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86 </example>
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87
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88 </para>
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89
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90 <para>
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91 如果当前配置层级没有<literal>limit_conn</literal>指令,将会从更高层级继承连接限制配置。
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92 </para>
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93
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94 </directive>
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95
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96
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97 <directive name="limit_conn_log_level">
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98 <syntax>
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99 <literal>info</literal> |
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100 <literal>notice</literal> |
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101 <literal>warn</literal> |
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102 <literal>error</literal></syntax>
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103 <default>error</default>
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104 <context>http</context>
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105 <context>server</context>
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106 <context>location</context>
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107 <appeared-in>0.8.18</appeared-in>
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108
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109 <para>
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110 指定当连接数超过设定的最大连接数,服务器限制连接时的日志等级。
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111 </para>
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112
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113 </directive>
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114
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115
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116 <directive name="limit_conn_zone">
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117 <syntax>
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118 <value>$variable</value>
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119 <literal>zone</literal>=<value>name</value>:<value>size</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 设定保存各个键的状态的共享内存空间的参数。键的状态中保存了当前连接数。键的值可以是特定变量的任何非空值(空值将不会被考虑)。
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125 使用范例:
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126 <example>
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127 limit_conn_zone $binary_remote_addr zone=addr:10m;
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128 </example>
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129 这里,设置客户端的IP地址作为键。注意,这里使用的是<var>$binary_remote_addr</var>变量,而不是<var>$remote_addr</var>变量。<var>$remote_addr</var>变量的长度为7字节到15字节不等,而存储状态在32位平台中占用32字节或64字节,在64位平台中占用64字节。而<var>$binary_remote_addr</var>变量的长度是固定的4字节,存储状态在32位平台中占用32字节或64字节,在64位平台中占用64字节。一兆字节的共享内存空间可以保存3.2万个32位的状态,1.6万个64位的状态。如果共享内存空间被耗尽,服务器将会对后续所有的请求返回
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130 <http-status code="503" text="Service Temporarily Unavailable"/>
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131 错误。
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132 </para>
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133
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134 </directive>
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135
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136
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137 <directive name="limit_zone">
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138 <syntax>
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139 <value>name</value>
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140 <value>$variable</value>
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141 <value>size</value></syntax>
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142 <default/>
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143 <context>http</context>
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144
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145 <para>
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146 这条指令在 1.1.8 版本中已经被废弃,应该使用等效的<link id="limit_conn_zone"/>指令。该指令的语法也有变化:
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147 <note>
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148 <literal>limit_conn_zone</literal>
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149 <value>$variable</value>
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150 <literal>zone</literal>=<value>name</value>:<value>size</value>;
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151 </note>
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152 </para>
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153
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154 </directive>
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155
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156 </section>
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157
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158 </module>