Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_log_module.xml @ 779:32b8498cfb40
$msec and $request_time have become generic variables in 1.2.6.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 11 Dec 2012 07:59:40 +0000 |
parents | 47ad88faaa3f |
children | 41363f013cc9 |
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="Module ngx_http_log_module" |
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11 link="/en/docs/http/ngx_http_log_module.html" |
589 | 12 lang="en" |
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13 rev="6"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
271 | 18 The <literal>ngx_http_log_module</literal> module writes request logs |
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19 in the specified format. |
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20 </para> |
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21 |
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22 <para> |
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23 Requests are logged in a context of a location where processing ends. |
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24 This may be different from the original location, if an |
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25 <link doc="ngx_http_core_module.xml" id="internal">internal |
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26 redirect</link> happens during request processing. |
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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 <example> |
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36 log_format gzip '$remote_addr - $remote_user [$time_local] ' |
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37 '"$request" $status $bytes_sent ' |
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38 '"$http_referer" "$http_user_agent" "$gzip_ratio"'; |
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39 |
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40 access_log /spool/logs/nginx-access.log gzip buffer=32k; |
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41 </example> |
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42 </para> |
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43 |
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44 </section> |
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45 |
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46 |
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47 <section id="directives" name="Directives"> |
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48 |
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49 <directive name="access_log"> |
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50 <syntax> |
364 | 51 <value>path</value> |
52 [<value>format</value> | |
53 [<literal>buffer</literal>=<value>size</value>]]</syntax> | |
271 | 54 <syntax><literal>off</literal></syntax> |
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55 <default>logs/access.log combined</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 <context>if in location</context> |
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60 <context>limit_except</context> |
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61 |
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62 <para> |
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63 Sets the path, format, and buffer size for the buffered log writes. |
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64 Several logs can be specified on the same level. |
364 | 65 The special value <literal>off</literal> cancels all |
66 <literal>access_log</literal> directives on the current level. | |
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67 If format is not specified then the predefined format |
271 | 68 “<literal>combined</literal>” is used. |
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69 </para> |
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70 |
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71 <para> |
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72 The buffer size must not exceed the size of the atomic write to a disk file. |
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73 For FreeBSD this size is unlimited. |
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74 </para> |
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75 |
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76 <para> |
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77 The file path can contain variables (0.7.6+), |
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78 but such logs have some constraints: |
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79 <list type="bullet"> |
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80 |
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81 <listitem> |
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82 the <link doc="../ngx_core_module.xml" id="user"/> |
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83 whose credentials are used by worker processes should |
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84 have permissions to create files in a directory with |
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85 such logs; |
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86 </listitem> |
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87 |
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88 <listitem> |
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89 buffered writes do not work; |
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90 </listitem> |
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91 |
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92 <listitem> |
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93 a file is opened and closed for each log write. |
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94 However, since the descriptors of frequently used files can be stored |
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95 in a <link id="open_log_file_cache">cache</link>, writes during the |
271 | 96 time specified by the <literal>valid</literal> parameter of the |
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97 <link id="open_log_file_cache"/> directive can continue to be made |
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98 to the old file. |
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99 </listitem> |
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100 |
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101 <listitem> |
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102 during each log write the existence of the request’s |
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103 <link doc="ngx_http_core_module.xml" id="root">root directory</link> |
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104 is checked, and if it does not exist the log is not |
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105 created. |
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106 It is thus a good idea to specify both |
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107 <link doc="ngx_http_core_module.xml" id="root"/> |
271 | 108 and <literal>access_log</literal> on the same level: |
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109 <example> |
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110 server { |
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111 root /spool/vhost/data/$host; |
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112 access_log /spool/vhost/logs/$host; |
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113 ... |
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114 </example> |
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115 </listitem> |
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116 |
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117 </list> |
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118 </para> |
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119 |
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120 </directive> |
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121 |
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122 |
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123 <directive name="log_format"> |
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124 <syntax> |
271 | 125 <value>name</value> |
126 <value>string</value> ...</syntax> | |
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127 <default>combined "..."</default> |
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128 <context>http</context> |
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129 |
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130 <para> |
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131 Specifies format of a log. |
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132 </para> |
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133 |
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134 <para> |
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135 The log format can contain common variables, and variables that |
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136 exist only at the time of a log write: |
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137 <list type="tag"> |
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138 |
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139 <tag-name><var>$bytes_sent</var></tag-name> |
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140 <tag-desc> |
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141 the number of bytes sent to a client |
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142 <note> |
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143 Since versions 1.3.8 and 1.2.5 there is a common variable with the |
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144 <link doc="ngx_http_core_module.xml" id="var_bytes_sent">same name</link>. |
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145 </note> |
224
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146 </tag-desc> |
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147 |
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148 <tag-name><var>$connection</var></tag-name> |
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149 <tag-desc> |
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150 connection serial number |
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151 <note> |
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152 Since versions 1.3.8 and 1.2.5 there is a common variable with the |
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153 <link doc="ngx_http_core_module.xml" id="var_connection">same name</link>. |
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154 </note> |
224
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155 </tag-desc> |
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156 |
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157 <tag-name><var>$connection_requests</var></tag-name> |
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158 <tag-desc> |
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159 the current number of requests made through a connection (1.1.18) |
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160 <note> |
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161 Since versions 1.3.8 and 1.2.5 there is a common variable with the |
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162 <link doc="ngx_http_core_module.xml" id="var_connection_requests">same |
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163 name</link>. |
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164 </note> |
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165 </tag-desc> |
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166 |
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167 <tag-name><var>$msec</var></tag-name> |
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168 <tag-desc> |
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169 time in seconds with a milliseconds resolution at the time of log write |
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170 <note> |
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171 Since versions 1.3.9 and 1.2.6 there is a common variable with the |
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172 <link doc="ngx_http_core_module.xml" id="var_msec">same name</link>. |
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173 </note> |
224
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174 </tag-desc> |
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175 |
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176 <tag-name><var>$pipe</var></tag-name> |
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177 <tag-desc> |
271 | 178 “<literal>p</literal>” if request was pipelined, “<literal>.</literal>” |
179 otherwise | |
224
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180 </tag-desc> |
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181 |
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182 <tag-name><var>$request_length</var></tag-name> |
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183 <tag-desc> |
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184 request length (including request line, header, and request body) |
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185 </tag-desc> |
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186 |
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187 <tag-name><var>$request_time</var></tag-name> |
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188 <tag-desc> |
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189 request processing time in seconds with a milliseconds resolution; |
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190 time elapsed between the first bytes were read from the client and |
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191 the log write after the last bytes were sent to the client |
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192 <note> |
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193 Since versions 1.3.9 and 1.2.6 there is a common variable with the |
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194 <link doc="ngx_http_core_module.xml" id="var_request_time">same name</link>. |
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195 </note> |
224
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196 </tag-desc> |
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197 |
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198 <tag-name><var>$status</var></tag-name> |
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199 <tag-desc> |
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200 response status |
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201 <note> |
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202 Since versions 1.3.2 and 1.2.2 there is a common variable with the |
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203 <link doc="ngx_http_core_module.xml" id="var_status">same name</link>. |
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204 </note> |
224
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205 </tag-desc> |
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206 |
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207 <tag-name><var>$time_iso8601</var></tag-name> |
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208 <tag-desc> |
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209 local time in the ISO 8601 standard format |
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210 </tag-desc> |
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211 |
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212 <tag-name><var>$time_local</var></tag-name> |
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213 <tag-desc> |
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214 local time in the Common Log Format |
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215 </tag-desc> |
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216 |
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217 </list> |
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218 </para> |
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219 |
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220 <para> |
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221 Header lines sent to a client have the prefix |
271 | 222 “<literal>sent_http_</literal>”, for example, |
224
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223 <var>$sent_http_content_range</var>. |
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224 </para> |
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225 |
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226 <para> |
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227 The configuration always includes the predefined format |
271 | 228 “<literal>combined</literal>”: |
224
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229 <example> |
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230 log_format combined '$remote_addr - $remote_user [$time_local] ' |
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231 '"$request" $status $body_bytes_sent ' |
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232 '"$http_referer" "$http_user_agent"'; |
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233 </example> |
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234 </para> |
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235 |
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236 </directive> |
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237 |
364 | 238 |
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239 <directive name="open_log_file_cache"> |
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240 |
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241 <syntax> |
271 | 242 <literal>max</literal>=<value>N</value> |
243 [<literal>inactive</literal>=<value>time</value>] | |
244 [<literal>min_uses</literal>=<value>N</value>] | |
245 [<literal>valid</literal>=<value>time</value>]</syntax> | |
246 <syntax><literal>off</literal></syntax> | |
224
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247 <default>off</default> |
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248 <context>http</context> |
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249 <context>server</context> |
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250 <context>location</context> |
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251 |
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252 <para> |
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253 Defines a cache that stores file descriptors of frequently used logs |
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254 whose names contain variables. |
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255 The directive has the following parameters: |
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256 <list type="tag"> |
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257 |
271 | 258 <tag-name><literal>max</literal></tag-name> |
224
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259 <tag-desc> |
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260 sets a maximum number of descriptors in a cache; |
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261 if cache becomes full the least recently used (LRU) |
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262 descriptors are closed |
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263 </tag-desc> |
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264 |
271 | 265 <tag-name><literal>inactive</literal></tag-name> |
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266 <tag-desc> |
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267 sets a time after which the cached descriptor is closed |
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268 if there were no access during this time; |
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269 by default, 10 seconds |
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270 </tag-desc> |
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271 |
271 | 272 <tag-name><literal>min_uses</literal></tag-name> |
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273 <tag-desc> |
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274 sets a minimum number of file uses during the time |
271 | 275 defined by the <literal>inactive</literal> parameter |
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276 after which the descriptor will stay open in a cache; |
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277 by default, 1 |
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278 </tag-desc> |
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279 |
271 | 280 <tag-name><literal>valid</literal></tag-name> |
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281 <tag-desc> |
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282 sets a time after which it should be checked that the file |
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283 still exists with the same name; by default, 60 seconds |
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284 </tag-desc> |
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285 |
271 | 286 <tag-name><literal>off</literal></tag-name> |
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287 <tag-desc> |
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288 disables caching |
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289 </tag-desc> |
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290 |
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291 </list> |
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292 </para> |
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293 |
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294 <para> |
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295 Example usage: |
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296 <example> |
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297 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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298 </example> |
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299 </para> |
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300 |
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301 </directive> |
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302 |
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303 </section> |
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304 |
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305 </module> |