Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_log_module.xml @ 351:a4fa80755eab
Consistently strip initial offset in examples.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 24 Jan 2012 11:01:22 +0000 |
parents | 4c6d2c614d2c |
children | bb51d3e17dd0 |
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 </section> |
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17 |
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18 |
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19 <section id="example" name="Example Configuration"> |
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20 |
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21 <para> |
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22 <example> |
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23 log_format gzip '$remote_addr - $remote_user [$time_local] ' |
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24 '"$request" $status $bytes_sent ' |
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25 '"$http_referer" "$http_user_agent" "$gzip_ratio"'; |
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26 |
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27 access_log /spool/logs/nginx-access.log gzip buffer=32k; |
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28 </example> |
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29 </para> |
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30 |
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31 </section> |
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32 |
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33 |
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34 <section id="directives" name="Directives"> |
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35 |
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36 <directive name="access_log"> |
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37 <syntax> |
271 | 38 <value>path</value> |
39 [<value>format</value> | |
40 [<literal>buffer</literal>=<value>size</value>]]</syntax> | |
41 <syntax><literal>off</literal></syntax> | |
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42 <default>log/access.log combined</default> |
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43 <context>http</context> |
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44 <context>server</context> |
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45 <context>location</context> |
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46 <context>if in location</context> |
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47 <context>limit_except</context> |
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48 |
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49 <para> |
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50 Sets the path, format, and buffer size for the buffered log writes. |
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51 Several logs can be specified on the same level. |
271 | 52 The special value <literal>off</literal> cancels all <literal>access_log</literal> |
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53 directives on the current level. |
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54 If format is not specified then the predefined format |
271 | 55 “<literal>combined</literal>” is used. |
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56 </para> |
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57 |
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58 <para> |
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59 The buffer size must not exceed the size of the atomic write to a disk file. |
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60 For FreeBSD 3.0-6.0 this size is unlimited. |
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61 </para> |
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62 |
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63 <para> |
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64 The file path can contain variables (0.7.6+), |
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65 but such logs have some constraints: |
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66 <list type="bullet"> |
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67 |
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68 <listitem> |
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69 the <link doc="../ngx_core_module.xml" id="user"/> |
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70 whose credentials are used by worker processes should |
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71 have permissions to create files in a directory with |
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72 such logs; |
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73 </listitem> |
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74 |
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75 <listitem> |
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76 buffered writes do not work; |
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77 </listitem> |
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78 |
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79 <listitem> |
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80 a file is opened and closed for each log write. |
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81 However, since the descriptors of frequently used files can be stored |
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82 in a <link id="open_log_file_cache">cache</link>, writes during the |
271 | 83 time specified by the <literal>valid</literal> parameter of the |
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84 <link id="open_log_file_cache"/> directive can continue to be made |
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85 to the old file. |
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86 </listitem> |
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87 |
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88 <listitem> |
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89 during each log write the existence of the request’s |
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90 <link doc="ngx_http_core_module.xml" id="root">root directory</link> |
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91 is checked, and if it does not exist the log is not |
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92 created. |
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93 It is thus a good idea to specify both |
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94 <link doc="ngx_http_core_module.xml" id="root"/> |
271 | 95 and <literal>access_log</literal> on the same level: |
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96 <example> |
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97 server { |
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98 root /spool/vhost/data/$host; |
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99 access_log /spool/vhost/logs/$host; |
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100 ... |
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101 </example> |
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102 </listitem> |
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103 |
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104 </list> |
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105 </para> |
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106 |
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107 </directive> |
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108 |
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109 |
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110 <directive name="log_format"> |
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111 <syntax> |
271 | 112 <value>name</value> |
113 <value>string</value> ...</syntax> | |
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114 <default>combined "..."</default> |
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115 <context>http</context> |
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116 |
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117 <para> |
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118 Specifies format of a log. |
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119 </para> |
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120 |
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121 <para> |
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122 The log format can contain common variables, and variables that |
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123 exist only at the time of a log write: |
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124 <list type="tag"> |
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125 |
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126 <tag-name><var>$body_bytes_sent</var></tag-name> |
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127 <tag-desc> |
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128 the number of bytes sent to a client not counting the response header; |
271 | 129 this variable is compatible with the “<literal>%B</literal>” parameter of the |
130 <literal>mod_log_config</literal> | |
224
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131 Apache module |
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132 </tag-desc> |
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133 |
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134 <tag-name><var>$bytes_sent</var></tag-name> |
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135 <tag-desc> |
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136 the number of bytes sent to a client |
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137 </tag-desc> |
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138 |
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139 <tag-name><var>$connection</var></tag-name> |
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140 <tag-desc> |
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141 connection serial number |
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142 </tag-desc> |
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143 |
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144 <tag-name><var>$msec</var></tag-name> |
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145 <tag-desc> |
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146 time in seconds with a milliseconds resolution at the time of log write |
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147 </tag-desc> |
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148 |
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149 <tag-name><var>$pipe</var></tag-name> |
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150 <tag-desc> |
271 | 151 “<literal>p</literal>” if request was pipelined, “<literal>.</literal>” |
152 otherwise | |
224
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153 </tag-desc> |
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154 |
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155 <tag-name><var>$request_length</var></tag-name> |
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156 <tag-desc> |
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157 request length (including request line, header, and request body) |
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158 </tag-desc> |
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159 |
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160 <tag-name><var>$request_time</var></tag-name> |
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161 <tag-desc> |
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162 request processing time in seconds with a milliseconds resolution; |
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163 time elapsed since first bytes were read from the client till |
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164 last bytes were sent to client and logging happened |
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165 </tag-desc> |
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166 |
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167 <tag-name><var>$status</var></tag-name> |
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168 <tag-desc> |
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169 response status |
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170 </tag-desc> |
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171 |
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172 <tag-name><var>$time_iso8601</var></tag-name> |
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173 <tag-desc> |
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174 local time in the ISO 8601 standard format |
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175 </tag-desc> |
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176 |
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177 <tag-name><var>$time_local</var></tag-name> |
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178 <tag-desc> |
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179 local time in the Common Log Format |
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180 </tag-desc> |
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181 |
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182 </list> |
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183 </para> |
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184 |
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185 <para> |
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186 Header lines sent to a client have the prefix |
271 | 187 “<literal>sent_http_</literal>”, for example, |
224
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188 <var>$sent_http_content_range</var>. |
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189 </para> |
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190 |
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191 <para> |
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192 The configuration always includes the predefined format |
271 | 193 “<literal>combined</literal>”: |
224
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194 <example> |
351
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195 log_format combined '$remote_addr - $remote_user [$time_local] ' |
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196 '"$request" $status $body_bytes_sent ' |
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197 '"$http_referer" "$http_user_agent"'; |
224
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198 </example> |
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199 </para> |
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200 |
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201 </directive> |
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202 |
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203 <directive name="open_log_file_cache"> |
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204 |
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205 <syntax> |
271 | 206 <literal>max</literal>=<value>N</value> |
207 [<literal>inactive</literal>=<value>time</value>] | |
208 [<literal>min_uses</literal>=<value>N</value>] | |
209 [<literal>valid</literal>=<value>time</value>]</syntax> | |
210 <syntax><literal>off</literal></syntax> | |
224
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211 <default>off</default> |
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212 <context>http</context> |
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213 <context>server</context> |
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214 <context>location</context> |
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215 |
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216 <para> |
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217 Defines a cache that stores file descriptors of frequently used logs |
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218 whose names contain variables. |
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219 The directive has the following parameters: |
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220 <list type="tag"> |
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221 |
271 | 222 <tag-name><literal>max</literal></tag-name> |
224
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223 <tag-desc> |
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224 sets a maximum number of descriptors in a cache; |
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225 if cache becomes full the least recently used (LRU) |
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226 descriptors are closed |
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227 </tag-desc> |
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228 |
271 | 229 <tag-name><literal>inactive</literal></tag-name> |
224
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230 <tag-desc> |
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231 sets a time after which the cached descriptor is closed |
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232 if there were no access during this time; |
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233 by default, 10 seconds |
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234 </tag-desc> |
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235 |
271 | 236 <tag-name><literal>min_uses</literal></tag-name> |
224
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237 <tag-desc> |
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238 sets a minimum number of file uses during the time |
271 | 239 defined by the <literal>inactive</literal> parameter |
224
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240 after which the descriptor will stay open in a cache; |
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241 by default, 1 |
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242 </tag-desc> |
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243 |
271 | 244 <tag-name><literal>valid</literal></tag-name> |
224
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245 <tag-desc> |
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246 sets a time after which it should be checked that the file |
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247 still exists with the same name; by default, 60 seconds |
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248 </tag-desc> |
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249 |
271 | 250 <tag-name><literal>off</literal></tag-name> |
224
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251 <tag-desc> |
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252 disables caching |
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253 </tag-desc> |
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254 |
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255 </list> |
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256 </para> |
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257 |
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258 <para> |
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259 Example usage: |
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260 <example> |
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261 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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262 </example> |
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263 </para> |
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264 |
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265 </directive> |
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266 |
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267 </section> |
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268 |
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269 </module> |