Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_log_module.xml @ 444:43c84d19bf92
Added a note about the NGINX environment variable.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 12 Mar 2012 12:32:04 +0000 |
parents | 1b2264bdd433 |
children | 6351ab788157 |
rev | line source |
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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="Module ngx_http_log_module" |
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6 link="/en/docs/http/ngx_http_log_module.html" |
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7 lang="en"> |
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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 The <literal>ngx_http_log_module</literal> module writes request logs |
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13 in the specified format. |
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14 </para> |
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15 |
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16 <para> |
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17 Requests are logged in a context of a location where processing ends. |
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18 This may be different from the original location, if an |
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19 <link doc="ngx_http_core_module.xml" id="internal">internal |
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20 redirect</link> happens during request processing. |
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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 log_format gzip '$remote_addr - $remote_user [$time_local] ' |
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31 '"$request" $status $bytes_sent ' |
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32 '"$http_referer" "$http_user_agent" "$gzip_ratio"'; |
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33 |
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34 access_log /spool/logs/nginx-access.log gzip buffer=32k; |
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35 </example> |
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36 </para> |
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37 |
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38 </section> |
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39 |
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40 |
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41 <section id="directives" name="Directives"> |
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42 |
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43 <directive name="access_log"> |
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44 <syntax> |
364 | 45 <value>path</value> |
46 [<value>format</value> | |
47 [<literal>buffer</literal>=<value>size</value>]]</syntax> | |
271 | 48 <syntax><literal>off</literal></syntax> |
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49 <default>logs/access.log combined</default> |
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50 <context>http</context> |
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51 <context>server</context> |
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52 <context>location</context> |
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53 <context>if in location</context> |
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54 <context>limit_except</context> |
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55 |
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56 <para> |
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57 Sets the path, format, and buffer size for the buffered log writes. |
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58 Several logs can be specified on the same level. |
364 | 59 The special value <literal>off</literal> cancels all |
60 <literal>access_log</literal> directives on the current level. | |
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61 If format is not specified then the predefined format |
271 | 62 “<literal>combined</literal>” is used. |
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63 </para> |
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64 |
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65 <para> |
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66 The buffer size must not exceed the size of the atomic write to a disk file. |
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67 For FreeBSD 3.0-6.0 this size is unlimited. |
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68 </para> |
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69 |
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70 <para> |
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71 The file path can contain variables (0.7.6+), |
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72 but such logs have some constraints: |
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73 <list type="bullet"> |
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74 |
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75 <listitem> |
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76 the <link doc="../ngx_core_module.xml" id="user"/> |
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77 whose credentials are used by worker processes should |
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78 have permissions to create files in a directory with |
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79 such logs; |
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80 </listitem> |
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81 |
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82 <listitem> |
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83 buffered writes do not work; |
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84 </listitem> |
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85 |
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86 <listitem> |
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87 a file is opened and closed for each log write. |
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88 However, since the descriptors of frequently used files can be stored |
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89 in a <link id="open_log_file_cache">cache</link>, writes during the |
271 | 90 time specified by the <literal>valid</literal> parameter of the |
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91 <link id="open_log_file_cache"/> directive can continue to be made |
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92 to the old file. |
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93 </listitem> |
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94 |
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95 <listitem> |
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96 during each log write the existence of the request’s |
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97 <link doc="ngx_http_core_module.xml" id="root">root directory</link> |
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98 is checked, and if it does not exist the log is not |
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99 created. |
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100 It is thus a good idea to specify both |
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101 <link doc="ngx_http_core_module.xml" id="root"/> |
271 | 102 and <literal>access_log</literal> on the same level: |
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103 <example> |
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104 server { |
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105 root /spool/vhost/data/$host; |
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106 access_log /spool/vhost/logs/$host; |
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107 ... |
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108 </example> |
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109 </listitem> |
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110 |
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111 </list> |
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112 </para> |
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113 |
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114 </directive> |
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115 |
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116 |
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117 <directive name="log_format"> |
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118 <syntax> |
271 | 119 <value>name</value> |
120 <value>string</value> ...</syntax> | |
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121 <default>combined "..."</default> |
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122 <context>http</context> |
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123 |
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124 <para> |
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125 Specifies format of a log. |
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126 </para> |
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127 |
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128 <para> |
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129 The log format can contain common variables, and variables that |
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130 exist only at the time of a log write: |
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131 <list type="tag"> |
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132 |
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133 <tag-name><var>$body_bytes_sent</var></tag-name> |
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134 <tag-desc> |
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135 the number of bytes sent to a client not counting the response header; |
271 | 136 this variable is compatible with the “<literal>%B</literal>” parameter of the |
137 <literal>mod_log_config</literal> | |
224
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138 Apache module |
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139 </tag-desc> |
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140 |
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141 <tag-name><var>$bytes_sent</var></tag-name> |
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142 <tag-desc> |
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143 the number of bytes sent to a client |
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144 </tag-desc> |
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145 |
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146 <tag-name><var>$connection</var></tag-name> |
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147 <tag-desc> |
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148 connection serial number |
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149 </tag-desc> |
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150 |
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151 <tag-name><var>$msec</var></tag-name> |
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152 <tag-desc> |
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153 time in seconds with a milliseconds resolution at the time of log write |
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154 </tag-desc> |
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155 |
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156 <tag-name><var>$pipe</var></tag-name> |
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157 <tag-desc> |
271 | 158 “<literal>p</literal>” if request was pipelined, “<literal>.</literal>” |
159 otherwise | |
224
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160 </tag-desc> |
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161 |
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162 <tag-name><var>$request_length</var></tag-name> |
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163 <tag-desc> |
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164 request length (including request line, header, and request body) |
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165 </tag-desc> |
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166 |
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167 <tag-name><var>$request_time</var></tag-name> |
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168 <tag-desc> |
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169 request processing time in seconds with a milliseconds resolution; |
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170 time elapsed since first bytes were read from the client till |
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171 last bytes were sent to client and logging happened |
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172 </tag-desc> |
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173 |
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174 <tag-name><var>$status</var></tag-name> |
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175 <tag-desc> |
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176 response status |
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177 </tag-desc> |
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178 |
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179 <tag-name><var>$time_iso8601</var></tag-name> |
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180 <tag-desc> |
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181 local time in the ISO 8601 standard format |
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182 </tag-desc> |
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183 |
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184 <tag-name><var>$time_local</var></tag-name> |
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185 <tag-desc> |
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186 local time in the Common Log Format |
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187 </tag-desc> |
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188 |
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189 </list> |
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190 </para> |
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191 |
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192 <para> |
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193 Header lines sent to a client have the prefix |
271 | 194 “<literal>sent_http_</literal>”, for example, |
224
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195 <var>$sent_http_content_range</var>. |
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196 </para> |
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197 |
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198 <para> |
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199 The configuration always includes the predefined format |
271 | 200 “<literal>combined</literal>”: |
224
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201 <example> |
351
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202 log_format combined '$remote_addr - $remote_user [$time_local] ' |
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203 '"$request" $status $body_bytes_sent ' |
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204 '"$http_referer" "$http_user_agent"'; |
224
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205 </example> |
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206 </para> |
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207 |
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208 </directive> |
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209 |
364 | 210 |
224
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211 <directive name="open_log_file_cache"> |
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212 |
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213 <syntax> |
271 | 214 <literal>max</literal>=<value>N</value> |
215 [<literal>inactive</literal>=<value>time</value>] | |
216 [<literal>min_uses</literal>=<value>N</value>] | |
217 [<literal>valid</literal>=<value>time</value>]</syntax> | |
218 <syntax><literal>off</literal></syntax> | |
224
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219 <default>off</default> |
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220 <context>http</context> |
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221 <context>server</context> |
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222 <context>location</context> |
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223 |
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224 <para> |
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225 Defines a cache that stores file descriptors of frequently used logs |
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226 whose names contain variables. |
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227 The directive has the following parameters: |
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228 <list type="tag"> |
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229 |
271 | 230 <tag-name><literal>max</literal></tag-name> |
224
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231 <tag-desc> |
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232 sets a maximum number of descriptors in a cache; |
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233 if cache becomes full the least recently used (LRU) |
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234 descriptors are closed |
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235 </tag-desc> |
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236 |
271 | 237 <tag-name><literal>inactive</literal></tag-name> |
224
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238 <tag-desc> |
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239 sets a time after which the cached descriptor is closed |
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240 if there were no access during this time; |
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241 by default, 10 seconds |
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242 </tag-desc> |
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243 |
271 | 244 <tag-name><literal>min_uses</literal></tag-name> |
224
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245 <tag-desc> |
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246 sets a minimum number of file uses during the time |
271 | 247 defined by the <literal>inactive</literal> parameter |
224
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248 after which the descriptor will stay open in a cache; |
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249 by default, 1 |
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250 </tag-desc> |
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251 |
271 | 252 <tag-name><literal>valid</literal></tag-name> |
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253 <tag-desc> |
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254 sets a time after which it should be checked that the file |
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255 still exists with the same name; by default, 60 seconds |
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256 </tag-desc> |
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257 |
271 | 258 <tag-name><literal>off</literal></tag-name> |
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259 <tag-desc> |
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260 disables caching |
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261 </tag-desc> |
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262 |
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263 </list> |
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264 </para> |
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265 |
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266 <para> |
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267 Example usage: |
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268 <example> |
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269 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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270 </example> |
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271 </para> |
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272 |
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273 </directive> |
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274 |
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275 </section> |
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276 |
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277 </module> |