Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_log_module.xml @ 548:95a970603b0f
Brought the "return" documentation up to date.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Sun, 24 Jun 2012 18:58:23 +0000 |
parents | e9a2a856d76b |
children | be54c443235a |
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>$connection</var></tag-name> |
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147 <tag-desc> |
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148 connection serial number |
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149 </tag-desc> |
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150 |
452
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151 <tag-name><var>$connection_requests</var></tag-name> |
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152 <tag-desc> |
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153 the current number of requests made through a connection |
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154 </tag-desc> |
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155 |
224
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156 <tag-name><var>$msec</var></tag-name> |
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157 <tag-desc> |
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158 time in seconds with a milliseconds resolution at the time of log write |
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159 </tag-desc> |
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160 |
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161 <tag-name><var>$pipe</var></tag-name> |
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162 <tag-desc> |
271 | 163 “<literal>p</literal>” if request was pipelined, “<literal>.</literal>” |
164 otherwise | |
224
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165 </tag-desc> |
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166 |
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167 <tag-name><var>$request_length</var></tag-name> |
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168 <tag-desc> |
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169 request length (including request line, header, and request body) |
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170 </tag-desc> |
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171 |
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172 <tag-name><var>$request_time</var></tag-name> |
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173 <tag-desc> |
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174 request processing time in seconds with a milliseconds resolution; |
451
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175 time elapsed between the first bytes were read from the client and |
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176 the log write after the last bytes were sent to the client |
224
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177 </tag-desc> |
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178 |
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179 <tag-name><var>$status</var></tag-name> |
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180 <tag-desc> |
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181 response status |
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182 </tag-desc> |
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183 |
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184 <tag-name><var>$time_iso8601</var></tag-name> |
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185 <tag-desc> |
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186 local time in the ISO 8601 standard format |
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187 </tag-desc> |
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188 |
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189 <tag-name><var>$time_local</var></tag-name> |
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190 <tag-desc> |
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191 local time in the Common Log Format |
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192 </tag-desc> |
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193 |
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194 </list> |
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195 </para> |
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196 |
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197 <para> |
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198 Header lines sent to a client have the prefix |
271 | 199 “<literal>sent_http_</literal>”, for example, |
224
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200 <var>$sent_http_content_range</var>. |
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201 </para> |
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202 |
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203 <para> |
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204 The configuration always includes the predefined format |
271 | 205 “<literal>combined</literal>”: |
224
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206 <example> |
351
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207 log_format combined '$remote_addr - $remote_user [$time_local] ' |
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208 '"$request" $status $body_bytes_sent ' |
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209 '"$http_referer" "$http_user_agent"'; |
224
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210 </example> |
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211 </para> |
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212 |
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213 </directive> |
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214 |
364 | 215 |
224
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216 <directive name="open_log_file_cache"> |
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217 |
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218 <syntax> |
271 | 219 <literal>max</literal>=<value>N</value> |
220 [<literal>inactive</literal>=<value>time</value>] | |
221 [<literal>min_uses</literal>=<value>N</value>] | |
222 [<literal>valid</literal>=<value>time</value>]</syntax> | |
223 <syntax><literal>off</literal></syntax> | |
224
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224 <default>off</default> |
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225 <context>http</context> |
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226 <context>server</context> |
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227 <context>location</context> |
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228 |
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229 <para> |
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230 Defines a cache that stores file descriptors of frequently used logs |
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231 whose names contain variables. |
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232 The directive has the following parameters: |
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233 <list type="tag"> |
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234 |
271 | 235 <tag-name><literal>max</literal></tag-name> |
224
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236 <tag-desc> |
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237 sets a maximum number of descriptors in a cache; |
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238 if cache becomes full the least recently used (LRU) |
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239 descriptors are closed |
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240 </tag-desc> |
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241 |
271 | 242 <tag-name><literal>inactive</literal></tag-name> |
224
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243 <tag-desc> |
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244 sets a time after which the cached descriptor is closed |
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245 if there were no access during this time; |
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246 by default, 10 seconds |
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247 </tag-desc> |
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248 |
271 | 249 <tag-name><literal>min_uses</literal></tag-name> |
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250 <tag-desc> |
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251 sets a minimum number of file uses during the time |
271 | 252 defined by the <literal>inactive</literal> parameter |
224
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253 after which the descriptor will stay open in a cache; |
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254 by default, 1 |
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255 </tag-desc> |
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256 |
271 | 257 <tag-name><literal>valid</literal></tag-name> |
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258 <tag-desc> |
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259 sets a time after which it should be checked that the file |
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260 still exists with the same name; by default, 60 seconds |
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261 </tag-desc> |
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262 |
271 | 263 <tag-name><literal>off</literal></tag-name> |
224
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264 <tag-desc> |
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265 disables caching |
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266 </tag-desc> |
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267 |
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268 </list> |
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269 </para> |
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270 |
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271 <para> |
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272 Example usage: |
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273 <example> |
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274 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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275 </example> |
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276 </para> |
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277 |
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278 </directive> |
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279 |
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280 </section> |
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281 |
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282 </module> |