annotate xml/en/docs/stream/ngx_stream_limit_conn_module.xml @ 1699:6c96a644b0b3

Corrected description of $binary_remote_addr and saved state.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 05 May 2016 14:43:40 +0300
parents 53ae63cb4cfa
children ab56dcd73af2
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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="Module ngx_stream_limit_conn_module"
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11 link="/en/docs/stream/ngx_stream_limit_conn_module.html"
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12 lang="en"
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13 rev="2">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_stream_limit_conn_module</literal> module (1.9.3) is used to
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19 limit the number of connections per the defined key, in
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20 particular, the number of connections from a single IP address.
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21 </para>
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22
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23 </section>
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24
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25
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26 <section id="example" name="Example Configuration">
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27
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28 <para>
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29 <example>
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30 stream {
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31 limit_conn_zone $binary_remote_addr zone=addr:10m;
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32
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33 ...
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34
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35 server {
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36
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37 ...
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38
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39 limit_conn addr 1;
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40 limit_conn_log_level error;
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41 }
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42 }
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43 </example>
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44 </para>
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45
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46 </section>
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47
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48
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49 <section id="directives" name="Directives">
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50
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51 <directive name="limit_conn">
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52 <syntax><value>zone</value> <value>number</value></syntax>
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53 <default/>
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54 <context>stream</context>
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55 <context>server</context>
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56
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57 <para>
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58 Sets the shared memory zone
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59 and the maximum allowed number of connections for a given key value.
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60 When this limit is exceeded, the server will close the connection.
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61 For example, the directives
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62 <example>
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63 limit_conn_zone $binary_remote_addr zone=addr:10m;
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64
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65 server {
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66 ...
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67 limit_conn addr 1;
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68 }
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69 </example>
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70 allow only one connection per an IP address at a time.
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71 </para>
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72
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73 <para>
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74 When several <literal>limit_conn</literal> directives are specified,
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75 any configured limit will apply.
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76 </para>
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78 <para>
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79 The directives are inherited from the previous level if and
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80 only if there are no
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81 <literal>limit_conn</literal>
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82 directives on the current level.
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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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88 <directive name="limit_conn_log_level">
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89 <syntax>
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90 <literal>info</literal> |
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91 <literal>notice</literal> |
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92 <literal>warn</literal> |
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93 <literal>error</literal></syntax>
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94 <default>error</default>
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95 <context>stream</context>
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96 <context>server</context>
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97
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98 <para>
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99 Sets the desired logging level for cases when the server
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100 limits the number of connections.
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101 </para>
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102
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103 </directive>
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104
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105
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106 <directive name="limit_conn_zone">
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107 <syntax>
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108 <value>key</value>
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109 <literal>zone</literal>=<value>name</value>:<value>size</value></syntax>
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110 <default/>
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111 <context>stream</context>
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112
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113 <para>
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114 Sets parameters for a shared memory zone
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115 that will keep states for various keys.
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116 In particular, the state includes the current number of connections.
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117 Currently, the supported value for the <value>key</value> is
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118 the client address in the binary form specified as
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119 <literal>$binary_remote_addr</literal>.
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120 Connections with an empty key value are not accounted.
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121 Usage example:
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122 <example>
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123 limit_conn_zone $binary_remote_addr zone=addr:10m;
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124 </example>
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125 Here, the key is a client IP address set by the
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126 <literal>$binary_remote_addr</literal> key.
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127 The size of <literal>$binary_remote_addr</literal>
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128 is 4 bytes for IPv4 addresses or 16 bytes for IPv6 addresses.
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129 The stored state always occupies 32 or 64 bytes
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130 on 32-bit platforms and 64 bytes on 64-bit platforms.
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131 One megabyte zone can keep about 32 thousand 32-byte states
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132 or about 16 thousand 64-byte states.
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53ae63cb4cfa Added the limit_conn module for stream.
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133 If the zone storage is exhausted, the server will close the connection.
179
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134 </para>
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135
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136 </directive>
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137
364
bb51d3e17dd0 Style fixed.
Ruslan Ermilov <ru@nginx.com>
parents: 351
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138
179
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139 </section>
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140
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141 </module>