Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_log_module.xml @ 1168:384bb0349a8a
Documented the "if" parameter of the "access_log" directive.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 24 Apr 2014 12:25:59 +0400 |
parents | 07402a11fd8d |
children | aab8a1667171 |
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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="12"> |
224
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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> |
966 | 23 Requests are logged in the context of a location where processing ends. |
24 It 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 compression '$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 compression buffer=32k; |
224
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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> | |
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53 [<literal>buffer</literal>=<value>size</value> |
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54 [<literal>flush</literal>=<value>time</value>]] |
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55 [<literal>if</literal>=<value>condition</value>]]</syntax> |
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56 <syntax> |
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57 <value>path</value> |
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58 <value>format</value> |
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59 <literal>gzip[=<value>level</value>]</literal> |
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60 [<literal>buffer</literal>=<value>size</value>] |
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61 [<literal>flush</literal>=<value>time</value>] |
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62 [<literal>if</literal>=<value>condition</value>]</syntax> |
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63 <syntax> |
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64 <literal>syslog:</literal><literal>server</literal>=<value>address</value>[,<value>parameter</value>=<value>value</value>] |
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65 [<value>format</value> |
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66 [<literal>if</literal>=<value>condition</value>]]</syntax> |
271 | 67 <syntax><literal>off</literal></syntax> |
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68 <default>logs/access.log combined</default> |
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69 <context>http</context> |
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70 <context>server</context> |
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71 <context>location</context> |
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72 <context>if in location</context> |
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73 <context>limit_except</context> |
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74 |
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75 <para> |
966 | 76 Sets the path, format, and configuration for a buffered log write. |
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77 Several logs can be specified on the same level. |
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78 Logging to syslog can be configured by specifying |
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79 the “<literal>syslog:</literal>” prefix in the first parameter. |
364 | 80 The special value <literal>off</literal> cancels all |
81 <literal>access_log</literal> directives on the current level. | |
966 | 82 If the format is not specified then the predefined |
83 “<literal>combined</literal>” format is used. | |
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84 </para> |
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85 |
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86 <para> |
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87 If either the <literal>buffer</literal> or <literal>gzip</literal> |
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88 (1.3.10, 1.2.7) |
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89 parameter is used, writes to log will be buffered. |
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90 <note> |
966 | 91 The buffer size must not exceed the size of an atomic write to a disk file. |
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92 For FreeBSD this size is unlimited. |
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93 </note> |
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94 </para> |
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95 |
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96 <para> |
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97 When buffering is enabled, the data will be written to the file: |
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98 <list type="bullet"> |
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99 |
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100 <listitem> |
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101 if the next log line does not fit into the buffer; |
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102 </listitem> |
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103 |
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104 <listitem> |
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105 if the buffered data is older than specified by the <literal>flush</literal> |
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106 parameter (1.3.10, 1.2.7); |
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107 </listitem> |
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108 |
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109 <listitem> |
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110 when a worker process is <link doc="../control.xml">re-opening</link> log |
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111 files or is shutting down. |
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112 </listitem> |
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113 |
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114 </list> |
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115 </para> |
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116 |
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117 <para> |
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118 If the <literal>gzip</literal> parameter is used, then the buffered data will |
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119 be compressed before writing to the file. |
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120 The compression level can be set between 1 (fastest, less compression) |
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121 and 9 (slowest, best compression). |
966 | 122 By default, the buffer size is equal to 64K bytes, and the compression level |
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123 is set to 1. |
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124 Since the data is compressed in atomic blocks, the log file can be decompressed |
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125 or read by “<literal>zcat</literal>” at any time. |
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126 </para> |
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127 |
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128 <para> |
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129 Example: |
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130 <example> |
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131 access_log /path/to/log.gz combined gzip flush=5m; |
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132 </example> |
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133 </para> |
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134 |
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135 <para> |
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136 <note> |
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137 For gzip compression to work, nginx must be built with the zlib library. |
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138 </note> |
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139 </para> |
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140 |
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141 <para> |
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142 The file path can contain variables (0.7.6+), |
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143 but such logs have some constraints: |
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144 <list type="bullet"> |
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145 |
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146 <listitem> |
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147 the <link doc="../ngx_core_module.xml" id="user"/> |
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148 whose credentials are used by worker processes should |
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149 have permissions to create files in a directory with |
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150 such logs; |
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151 </listitem> |
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152 |
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153 <listitem> |
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154 buffered writes do not work; |
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155 </listitem> |
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156 |
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157 <listitem> |
966 | 158 the file is opened and closed for each log write. |
224
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159 However, since the descriptors of frequently used files can be stored |
966 | 160 in a <link id="open_log_file_cache">cache</link>, writing to the old file |
161 can continue during the time specified by the <link id="open_log_file_cache"/> | |
162 directive’s <literal>valid</literal> parameter | |
224
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163 </listitem> |
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164 |
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165 <listitem> |
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166 during each log write the existence of the request’s |
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167 <link doc="ngx_http_core_module.xml" id="root">root directory</link> |
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168 is checked, and if it does not exist the log is not |
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169 created. |
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170 It is thus a good idea to specify both |
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171 <link doc="ngx_http_core_module.xml" id="root"/> |
271 | 172 and <literal>access_log</literal> on the same level: |
224
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173 <example> |
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174 server { |
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175 root /spool/vhost/data/$host; |
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176 access_log /spool/vhost/logs/$host; |
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177 ... |
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178 </example> |
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179 </listitem> |
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180 |
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181 </list> |
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182 </para> |
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183 |
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184 <para> |
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185 The <literal>if</literal> parameter (1.7.0) enables conditional logging. |
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186 A request will not be logged if the <value>condition</value> evaluates to “0” |
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187 or an empty string. |
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188 In the following example, the requests with response codes 2xx and 3xx |
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189 will not be logged: |
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190 <example> |
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191 map $status $loggable { |
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192 ~^[23] 0; |
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193 default 1; |
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194 } |
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195 |
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196 access_log /path/to/access.log combined if=$loggable; |
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197 </example> |
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198 </para> |
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199 |
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200 <para> |
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201 The following parameters configure logging to syslog: |
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202 <list type="tag"> |
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203 |
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204 <tag-name><literal>server=</literal><value>address</value></tag-name> |
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205 <tag-desc> |
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206 Defines the address of a syslog server. |
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207 The address can be specified as a domain name, IP address, or |
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208 a UNIX-domain socket path (specified after the “<literal>unix:</literal>” |
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209 prefix). |
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210 With a domain name or IP address, the port can be specified. |
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211 If port is not specified, the port 514 is used. |
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212 If a domain name resolves to several IP addresses, the first resolved |
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213 address is used. |
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214 </tag-desc> |
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215 |
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216 <tag-name><literal>facility=</literal><value>string</value></tag-name> |
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217 <tag-desc> |
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218 Sets facility of syslog messages, as defined in |
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219 <link url="http://tools.ietf.org/html/rfc3164#section-4.1.1">RFC 3164</link>. |
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220 Facility can be one of “<literal>kern</literal>”, “<literal>user</literal>”, |
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221 “<literal>mail</literal>”, “<literal>daemon</literal>”, |
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222 “<literal>auth</literal>”, “<literal>intern</literal>”, |
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223 “<literal>lpr</literal>”, “<literal>news</literal>”, “<literal>uucp</literal>”, |
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224 “<literal>clock</literal>”, “<literal>authpriv</literal>”, |
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225 “<literal>ftp</literal>”, “<literal>ntp</literal>”, “<literal>audit</literal>”, |
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226 “<literal>alert</literal>”, “<literal>cron</literal>”, |
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227 “<literal>local0</literal>”..“<literal>local7</literal>”. |
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228 Default is “<literal>local7</literal>”. |
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229 </tag-desc> |
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230 |
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231 <tag-name><literal>severity=</literal><value>string</value></tag-name> |
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232 <tag-desc> |
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233 Sets severity of syslog messages, as defined in |
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234 <link url="http://tools.ietf.org/html/rfc3164#section-4.1.1">RFC 3164</link>. |
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235 Possible values are the same as for the second parameter (level) of the |
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236 <link doc="../ngx_core_module.xml" id="error_log"/> directive. |
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237 Default is “<literal>info</literal>”. |
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238 </tag-desc> |
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239 |
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240 <tag-name><literal>tag=</literal><value>string</value></tag-name> |
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241 <tag-desc> |
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242 Sets the tag of syslog messages. |
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243 Default is “<literal>nginx</literal>”. |
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244 </tag-desc> |
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245 |
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246 <!-- |
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247 <tag-name><literal>bare=</literal><literal>on</literal> | |
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248 <literal>off</literal></tag-name> |
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249 <tag-desc> |
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250 If enabled, messages are sent without syslog headers. |
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251 Default is <literal>off</literal>. |
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252 </tag-desc> |
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253 --> |
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254 |
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255 </list> |
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256 Example syslog configuration: |
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257 <example> |
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258 access_log syslog:server=192.168.1.1; |
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259 access_log syslog:server=unix:/var/log/nginx.sock; |
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260 access_log syslog:server=[2001:db8::1]:12345,facility=local7,tag=nginx,severity=info combined; |
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261 </example> |
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262 </para> |
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263 |
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264 <para> |
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265 <note> |
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266 Logging to syslog is available as part of our |
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267 <commercial_version>commercial subscription</commercial_version>. |
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268 </note> |
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269 </para> |
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270 |
224
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271 </directive> |
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272 |
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273 |
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274 <directive name="log_format"> |
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275 <syntax> |
271 | 276 <value>name</value> |
277 <value>string</value> ...</syntax> | |
224
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278 <default>combined "..."</default> |
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279 <context>http</context> |
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280 |
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281 <para> |
966 | 282 Specifies log format. |
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283 </para> |
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284 |
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285 <para> |
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286 The log format can contain common variables, and variables that |
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287 exist only at the time of a log write: |
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288 <list type="tag"> |
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289 |
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290 <tag-name id="var_bytes_sent"><var>$bytes_sent</var></tag-name> |
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291 <tag-desc> |
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292 the number of bytes sent to a client |
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293 </tag-desc> |
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294 |
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295 <tag-name id="var_connection"><var>$connection</var></tag-name> |
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296 <tag-desc> |
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297 connection serial number |
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298 </tag-desc> |
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299 |
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300 <tag-name id="var_connection_requests"><var>$connection_requests</var> |
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301 </tag-name> |
452
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302 <tag-desc> |
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303 the current number of requests made through a connection (1.1.18) |
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304 </tag-desc> |
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305 |
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306 <tag-name id="var_msec"><var>$msec</var></tag-name> |
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307 <tag-desc> |
966 | 308 time in seconds with a milliseconds resolution at the time of the log write |
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309 </tag-desc> |
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310 |
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311 <tag-name id="var_pipe"><var>$pipe</var></tag-name> |
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312 <tag-desc> |
271 | 313 “<literal>p</literal>” if request was pipelined, “<literal>.</literal>” |
314 otherwise | |
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315 </tag-desc> |
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316 |
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317 <tag-name id="var_request_length"><var>$request_length</var></tag-name> |
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318 <tag-desc> |
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319 request length (including request line, header, and request body) |
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320 </tag-desc> |
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321 |
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322 <tag-name id="var_request_time"><var>$request_time</var></tag-name> |
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323 <tag-desc> |
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324 request processing time in seconds with a milliseconds resolution; |
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325 time elapsed between the first bytes were read from the client and |
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326 the log write after the last bytes were sent to the client |
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327 </tag-desc> |
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328 |
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329 <tag-name id="var_status"><var>$status</var></tag-name> |
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330 <tag-desc> |
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331 response status |
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332 </tag-desc> |
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333 |
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334 <tag-name id="var_time_iso8601"><var>$time_iso8601</var></tag-name> |
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335 <tag-desc> |
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336 local time in the ISO 8601 standard format |
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337 </tag-desc> |
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338 |
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339 <tag-name id="var_time_local"><var>$time_local</var></tag-name> |
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340 <tag-desc> |
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341 local time in the Common Log Format |
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342 </tag-desc> |
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343 |
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344 </list> |
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345 |
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346 <note> |
966 | 347 In the modern nginx versions variables |
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348 <link doc="ngx_http_core_module.xml" id="var_status">$status</link> |
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349 (1.3.2, 1.2.2), |
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350 <link doc="ngx_http_core_module.xml" id="var_bytes_sent">$bytes_sent</link> |
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351 (1.3.8, 1.2.5), |
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352 <link doc="ngx_http_core_module.xml" id="var_connection">$connection</link> |
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353 (1.3.8, 1.2.5), |
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354 <link doc="ngx_http_core_module.xml" id="var_connection_requests">$connection_requests</link> |
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355 (1.3.8, 1.2.5), |
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356 <link doc="ngx_http_core_module.xml" id="var_msec">$msec</link> |
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357 (1.3.9, 1.2.6), |
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358 <link doc="ngx_http_core_module.xml" id="var_request_time">$request_time</link> |
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359 (1.3.9, 1.2.6), |
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360 <link doc="ngx_http_core_module.xml" id="var_pipe">$pipe</link> |
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361 (1.3.12, 1.2.7), |
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362 <link doc="ngx_http_core_module.xml" id="var_request_length">$request_length</link> |
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363 (1.3.12, 1.2.7), |
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364 <link doc="ngx_http_core_module.xml" id="var_time_iso8601">$time_iso8601</link> |
840
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365 (1.3.12, 1.2.7), |
826
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366 and |
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367 <link doc="ngx_http_core_module.xml" id="var_time_local">$time_local</link> |
840
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368 (1.3.12, 1.2.7) |
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369 are also available as common variables. |
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370 </note> |
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371 |
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372 </para> |
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373 |
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374 <para> |
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375 Header lines sent to a client have the prefix |
271 | 376 “<literal>sent_http_</literal>”, for example, |
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377 <var>$sent_http_content_range</var>. |
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378 </para> |
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379 |
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380 <para> |
966 | 381 The configuration always includes the predefined |
382 “<literal>combined</literal>” format: | |
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383 <example> |
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384 log_format combined '$remote_addr - $remote_user [$time_local] ' |
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385 '"$request" $status $body_bytes_sent ' |
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386 '"$http_referer" "$http_user_agent"'; |
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387 </example> |
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388 </para> |
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389 |
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390 </directive> |
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391 |
364 | 392 |
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393 <directive name="open_log_file_cache"> |
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394 |
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395 <syntax> |
271 | 396 <literal>max</literal>=<value>N</value> |
397 [<literal>inactive</literal>=<value>time</value>] | |
398 [<literal>min_uses</literal>=<value>N</value>] | |
399 [<literal>valid</literal>=<value>time</value>]</syntax> | |
400 <syntax><literal>off</literal></syntax> | |
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401 <default>off</default> |
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402 <context>http</context> |
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403 <context>server</context> |
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404 <context>location</context> |
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405 |
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406 <para> |
966 | 407 Defines a cache that stores the file descriptors of frequently used logs |
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408 whose names contain variables. |
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409 The directive has the following parameters: |
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410 <list type="tag"> |
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411 |
271 | 412 <tag-name><literal>max</literal></tag-name> |
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413 <tag-desc> |
966 | 414 sets the maximum number of descriptors in a cache; |
415 if the cache becomes full the least recently used (LRU) | |
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416 descriptors are closed |
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417 </tag-desc> |
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418 |
271 | 419 <tag-name><literal>inactive</literal></tag-name> |
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420 <tag-desc> |
966 | 421 sets the time after which the cached descriptor is closed |
224
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422 if there were no access during this time; |
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423 by default, 10 seconds |
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424 </tag-desc> |
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425 |
271 | 426 <tag-name><literal>min_uses</literal></tag-name> |
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427 <tag-desc> |
966 | 428 sets the minimum number of file uses during the time |
271 | 429 defined by the <literal>inactive</literal> parameter |
966 | 430 to let the descriptor stay open in a cache; |
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431 by default, 1 |
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432 </tag-desc> |
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433 |
271 | 434 <tag-name><literal>valid</literal></tag-name> |
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435 <tag-desc> |
966 | 436 sets the time after which it should be checked that the file |
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437 still exists with the same name; by default, 60 seconds |
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438 </tag-desc> |
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439 |
271 | 440 <tag-name><literal>off</literal></tag-name> |
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441 <tag-desc> |
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442 disables caching |
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443 </tag-desc> |
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444 |
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445 </list> |
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446 </para> |
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447 |
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448 <para> |
966 | 449 Usage example: |
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450 <example> |
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451 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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452 </example> |
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453 </para> |
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454 |
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455 </directive> |
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456 |
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457 </section> |
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458 |
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459 </module> |