Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_session_log_module.xml @ 2559:82e6029db0c0
Updated with Netcraft June 2020 Web Server Survey stats.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 25 Jun 2020 13:12:56 +0100 |
parents | ca7568f67dee |
children | eeed494bba51 |
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) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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8 |
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9 <module name="Module ngx_http_session_log_module" |
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10 link="/en/docs/http/ngx_http_session_log_module.html" |
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11 lang="en" |
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12 rev="2"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 The <literal>ngx_http_session_log_module</literal> module enables logging |
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18 sessions (that is, aggregates of multiple HTTP requests) instead of |
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19 individual HTTP requests. |
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20 </para> |
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21 |
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22 <para> |
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23 <note> |
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24 This module is available as part of our |
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25 <commercial_version>commercial subscription</commercial_version>. |
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26 </note> |
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27 </para> |
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28 |
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29 </section> |
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30 |
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31 |
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32 <section id="example" name="Example Configuration"> |
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33 |
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34 <para> |
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35 The following configuration sets up a session log and maps requests to |
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36 sessions according to the request client address and <header>User-Agent</header> |
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37 request header field: |
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38 <example> |
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39 session_log_zone /path/to/log format=combined |
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40 zone=one:1m timeout=30s |
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41 md5=$binary_remote_addr$http_user_agent; |
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42 |
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43 location /media/ { |
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44 session_log one; |
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45 } |
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46 </example> |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
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52 <section id="directives" name="Directives"> |
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53 |
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54 <directive name="session_log"> |
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55 <syntax><value>name</value> | <literal>off</literal></syntax> |
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56 <default>off</default> |
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57 <context>http</context> |
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58 <context>server</context> |
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59 <context>location</context> |
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60 |
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61 <para> |
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62 Enables the use of the specified session log. |
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63 The special value <literal>off</literal> cancels all |
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64 <literal>session_log</literal> directives inherited from the previous |
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65 configuration level. |
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66 </para> |
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67 |
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68 </directive> |
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69 |
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70 |
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71 <directive name="session_log_format"> |
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72 <syntax> |
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73 <value>name</value> |
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74 <value>string</value> ...</syntax> |
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75 <default>combined "..."</default> |
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76 <context>http</context> |
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77 |
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78 <para> |
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79 Specifies the output format of a log. |
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80 The value of the <var>$body_bytes_sent</var> variable is aggregated across |
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81 all requests in a session. |
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82 The values of all other variables available for logging correspond to the |
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83 first request in a session. |
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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="session_log_zone"> |
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90 <syntax> |
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91 <value>path</value> |
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92 <literal>zone</literal>=<value>name</value>:<value>size</value> |
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93 [<literal>format</literal>=<value>format</value>] |
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94 [<literal>timeout</literal>=<value>time</value>] |
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95 [<literal>id</literal>=<value>id</value>] |
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96 [<literal>md5</literal>=<value>md5</value>] |
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97 </syntax> |
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98 <default/> |
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99 <context>http</context> |
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100 |
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101 <para> |
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102 Sets the path to a log file and configures the shared memory zone that is used |
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103 to store currently active sessions. |
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104 </para> |
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105 |
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106 <para> |
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107 A session is considered active for as long as the time elapsed since |
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108 the last request in the session does not exceed the specified |
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109 <literal>timeout</literal> (by default, 30 seconds). |
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110 Once a session is no longer active, it is written to the log. |
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111 </para> |
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112 |
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113 <para> |
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114 The <literal>id</literal> parameter identifies the |
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115 session to which a request is mapped. |
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116 The <literal>id</literal> parameter is set to the hexadecimal representation |
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117 of an MD5 hash (for example, obtained from a cookie using variables). |
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118 If this parameter is not specified or does not represent the valid |
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119 MD5 hash, nginx computes the MD5 hash from the value of |
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120 the <literal>md5</literal> parameter and creates a new session using this hash. |
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121 Both the <literal>id</literal> and <literal>md5</literal> parameters |
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122 can contain variables. |
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123 </para> |
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124 |
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125 <para> |
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126 The <literal>format</literal> parameter sets the custom session log |
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127 format configured by the <link id="session_log_format"/> directive. |
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128 If <literal>format</literal> is not specified, the predefined |
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129 “<literal>combined</literal>” format is used. |
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130 </para> |
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131 |
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132 </directive> |
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133 |
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134 </section> |
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135 |
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136 |
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137 <section id="variables" name="Embedded Variables"> |
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138 |
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139 <para> |
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140 The <literal>ngx_http_session_log_module</literal> module supports |
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141 two embedded variables: |
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142 |
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143 <list type="tag"> |
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144 |
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145 <tag-name id="var_session_log_id"><var>$session_log_id</var></tag-name> |
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146 <tag-desc> |
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147 current session ID; |
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148 </tag-desc> |
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149 |
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150 <tag-name id="var_session_log_binary_id"><var>$session_log_binary_id</var> |
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151 </tag-name> |
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152 <tag-desc> |
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153 current session ID in binary form (16 bytes). |
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154 </tag-desc> |
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155 |
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156 </list> |
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157 </para> |
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158 |
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159 </section> |
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160 |
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161 </module> |