Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_log_module.xml @ 1799:386a9a8a7ddc
Fixed a typo in the "udp" parameter of stream health_check.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 28 Sep 2016 20:18:15 +0300 |
parents | 080b36ad8d76 |
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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="15"> |
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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; |
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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>gzip[=<value>level</value>]</literal>] |
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55 [<literal>flush</literal>=<value>time</value>] |
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56 [<literal>if</literal>=<value>condition</value>]]</syntax> |
271 | 57 <syntax><literal>off</literal></syntax> |
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58 <default>logs/access.log combined</default> |
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59 <context>http</context> |
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60 <context>server</context> |
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61 <context>location</context> |
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62 <context>if in location</context> |
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63 <context>limit_except</context> |
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64 |
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65 <para> |
966 | 66 Sets the path, format, and configuration for a buffered log write. |
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67 Several logs can be specified on the same level. |
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68 Logging to <link doc="../syslog.xml">syslog</link> |
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69 can be configured by specifying |
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70 the “<literal>syslog:</literal>” prefix in the first parameter. |
364 | 71 The special value <literal>off</literal> cancels all |
72 <literal>access_log</literal> directives on the current level. | |
966 | 73 If the format is not specified then the predefined |
74 “<literal>combined</literal>” format is used. | |
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75 </para> |
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76 |
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77 <para> |
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78 If either the <literal>buffer</literal> or <literal>gzip</literal> |
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79 (1.3.10, 1.2.7) |
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80 parameter is used, writes to log will be buffered. |
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81 <note> |
966 | 82 The buffer size must not exceed the size of an atomic write to a disk file. |
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83 For FreeBSD this size is unlimited. |
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84 </note> |
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85 </para> |
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86 |
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87 <para> |
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88 When buffering is enabled, the data will be written to the file: |
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89 <list type="bullet"> |
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90 |
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91 <listitem> |
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92 if the next log line does not fit into the buffer; |
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93 </listitem> |
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94 |
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95 <listitem> |
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96 if the buffered data is older than specified by the <literal>flush</literal> |
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97 parameter (1.3.10, 1.2.7); |
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98 </listitem> |
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99 |
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100 <listitem> |
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101 when a worker process is <link doc="../control.xml">re-opening</link> log |
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102 files or is shutting down. |
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103 </listitem> |
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104 |
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105 </list> |
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106 </para> |
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107 |
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108 <para> |
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109 If the <literal>gzip</literal> parameter is used, then the buffered data will |
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110 be compressed before writing to the file. |
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111 The compression level can be set between 1 (fastest, less compression) |
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112 and 9 (slowest, best compression). |
966 | 113 By default, the buffer size is equal to 64K bytes, and the compression level |
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114 is set to 1. |
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115 Since the data is compressed in atomic blocks, the log file can be decompressed |
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116 or read by “<literal>zcat</literal>” at any time. |
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117 </para> |
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118 |
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119 <para> |
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120 Example: |
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121 <example> |
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122 access_log /path/to/log.gz combined gzip flush=5m; |
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123 </example> |
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124 </para> |
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125 |
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126 <para> |
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127 <note> |
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128 For gzip compression to work, nginx must be built with the zlib library. |
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129 </note> |
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130 </para> |
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131 |
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132 <para> |
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133 The file path can contain variables (0.7.6+), |
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134 but such logs have some constraints: |
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135 <list type="bullet"> |
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136 |
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137 <listitem> |
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138 the <link doc="../ngx_core_module.xml" id="user"/> |
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139 whose credentials are used by worker processes should |
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140 have permissions to create files in a directory with |
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141 such logs; |
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142 </listitem> |
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143 |
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144 <listitem> |
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145 buffered writes do not work; |
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146 </listitem> |
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147 |
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148 <listitem> |
966 | 149 the file is opened and closed for each log write. |
224
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150 However, since the descriptors of frequently used files can be stored |
966 | 151 in a <link id="open_log_file_cache">cache</link>, writing to the old file |
152 can continue during the time specified by the <link id="open_log_file_cache"/> | |
153 directive’s <literal>valid</literal> parameter | |
224
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154 </listitem> |
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155 |
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156 <listitem> |
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157 during each log write the existence of the request’s |
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158 <link doc="ngx_http_core_module.xml" id="root">root directory</link> |
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159 is checked, and if it does not exist the log is not |
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160 created. |
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161 It is thus a good idea to specify both |
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162 <link doc="ngx_http_core_module.xml" id="root"/> |
271 | 163 and <literal>access_log</literal> on the same level: |
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164 <example> |
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165 server { |
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166 root /spool/vhost/data/$host; |
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167 access_log /spool/vhost/logs/$host; |
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168 ... |
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169 </example> |
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170 </listitem> |
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171 |
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172 </list> |
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173 </para> |
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174 |
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175 <para> |
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176 The <literal>if</literal> parameter (1.7.0) enables conditional logging. |
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177 A request will not be logged if the <value>condition</value> evaluates to “0” |
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178 or an empty string. |
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179 In the following example, the requests with response codes 2xx and 3xx |
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180 will not be logged: |
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181 <example> |
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182 map $status $loggable { |
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183 ~^[23] 0; |
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184 default 1; |
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185 } |
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186 |
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187 access_log /path/to/access.log combined if=$loggable; |
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188 </example> |
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189 </para> |
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190 |
224
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191 </directive> |
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192 |
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193 |
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194 <directive name="log_format"> |
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195 <syntax> |
271 | 196 <value>name</value> |
197 <value>string</value> ...</syntax> | |
224
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198 <default>combined "..."</default> |
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199 <context>http</context> |
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200 |
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201 <para> |
966 | 202 Specifies log format. |
224
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203 </para> |
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204 |
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205 <para> |
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206 The log format can contain common variables, and variables that |
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207 exist only at the time of a log write: |
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208 <list type="tag"> |
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209 |
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210 <tag-name id="var_bytes_sent"><var>$bytes_sent</var></tag-name> |
224
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211 <tag-desc> |
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212 the number of bytes sent to a client |
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213 </tag-desc> |
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214 |
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215 <tag-name id="var_connection"><var>$connection</var></tag-name> |
224
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216 <tag-desc> |
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217 connection serial number |
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218 </tag-desc> |
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219 |
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220 <tag-name id="var_connection_requests"><var>$connection_requests</var> |
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221 </tag-name> |
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222 <tag-desc> |
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223 the current number of requests made through a connection (1.1.18) |
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224 </tag-desc> |
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225 |
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226 <tag-name id="var_msec"><var>$msec</var></tag-name> |
224
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227 <tag-desc> |
966 | 228 time in seconds with a milliseconds resolution at the time of the log write |
224
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229 </tag-desc> |
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230 |
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231 <tag-name id="var_pipe"><var>$pipe</var></tag-name> |
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232 <tag-desc> |
271 | 233 “<literal>p</literal>” if request was pipelined, “<literal>.</literal>” |
234 otherwise | |
224
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235 </tag-desc> |
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236 |
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237 <tag-name id="var_request_length"><var>$request_length</var></tag-name> |
224
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238 <tag-desc> |
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239 request length (including request line, header, and request body) |
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240 </tag-desc> |
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241 |
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242 <tag-name id="var_request_time"><var>$request_time</var></tag-name> |
224
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243 <tag-desc> |
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244 request processing time in seconds with a milliseconds resolution; |
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245 time elapsed between the first bytes were read from the client and |
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246 the log write after the last bytes were sent to the client |
224
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247 </tag-desc> |
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248 |
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249 <tag-name id="var_status"><var>$status</var></tag-name> |
224
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250 <tag-desc> |
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251 response status |
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252 </tag-desc> |
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253 |
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254 <tag-name id="var_time_iso8601"><var>$time_iso8601</var></tag-name> |
224
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255 <tag-desc> |
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256 local time in the ISO 8601 standard format |
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257 </tag-desc> |
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258 |
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259 <tag-name id="var_time_local"><var>$time_local</var></tag-name> |
224
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260 <tag-desc> |
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261 local time in the Common Log Format |
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262 </tag-desc> |
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263 |
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264 </list> |
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265 |
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266 <note> |
966 | 267 In the modern nginx versions variables |
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268 <link doc="ngx_http_core_module.xml" id="var_status">$status</link> |
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269 (1.3.2, 1.2.2), |
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270 <link doc="ngx_http_core_module.xml" id="var_bytes_sent">$bytes_sent</link> |
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271 (1.3.8, 1.2.5), |
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272 <link doc="ngx_http_core_module.xml" id="var_connection">$connection</link> |
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273 (1.3.8, 1.2.5), |
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274 <link doc="ngx_http_core_module.xml" id="var_connection_requests">$connection_requests</link> |
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275 (1.3.8, 1.2.5), |
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276 <link doc="ngx_http_core_module.xml" id="var_msec">$msec</link> |
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277 (1.3.9, 1.2.6), |
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278 <link doc="ngx_http_core_module.xml" id="var_request_time">$request_time</link> |
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279 (1.3.9, 1.2.6), |
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280 <link doc="ngx_http_core_module.xml" id="var_pipe">$pipe</link> |
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281 (1.3.12, 1.2.7), |
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282 <link doc="ngx_http_core_module.xml" id="var_request_length">$request_length</link> |
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283 (1.3.12, 1.2.7), |
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284 <link doc="ngx_http_core_module.xml" id="var_time_iso8601">$time_iso8601</link> |
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285 (1.3.12, 1.2.7), |
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286 and |
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287 <link doc="ngx_http_core_module.xml" id="var_time_local">$time_local</link> |
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288 (1.3.12, 1.2.7) |
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289 are also available as common variables. |
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290 </note> |
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291 |
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292 </para> |
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293 |
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294 <para> |
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295 Header lines sent to a client have the prefix |
271 | 296 “<literal>sent_http_</literal>”, for example, |
224
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297 <var>$sent_http_content_range</var>. |
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298 </para> |
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299 |
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300 <para> |
966 | 301 The configuration always includes the predefined |
302 “<literal>combined</literal>” format: | |
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303 <example> |
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304 log_format combined '$remote_addr - $remote_user [$time_local] ' |
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305 '"$request" $status $body_bytes_sent ' |
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306 '"$http_referer" "$http_user_agent"'; |
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307 </example> |
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308 </para> |
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309 |
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310 </directive> |
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311 |
364 | 312 |
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313 <directive name="open_log_file_cache"> |
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314 |
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315 <syntax> |
271 | 316 <literal>max</literal>=<value>N</value> |
317 [<literal>inactive</literal>=<value>time</value>] | |
318 [<literal>min_uses</literal>=<value>N</value>] | |
319 [<literal>valid</literal>=<value>time</value>]</syntax> | |
320 <syntax><literal>off</literal></syntax> | |
224
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321 <default>off</default> |
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322 <context>http</context> |
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323 <context>server</context> |
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324 <context>location</context> |
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325 |
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326 <para> |
966 | 327 Defines a cache that stores the file descriptors of frequently used logs |
224
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328 whose names contain variables. |
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329 The directive has the following parameters: |
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330 <list type="tag"> |
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331 |
271 | 332 <tag-name><literal>max</literal></tag-name> |
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333 <tag-desc> |
966 | 334 sets the maximum number of descriptors in a cache; |
335 if the cache becomes full the least recently used (LRU) | |
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336 descriptors are closed |
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337 </tag-desc> |
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338 |
271 | 339 <tag-name><literal>inactive</literal></tag-name> |
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340 <tag-desc> |
966 | 341 sets the time after which the cached descriptor is closed |
224
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342 if there were no access during this time; |
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343 by default, 10 seconds |
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344 </tag-desc> |
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345 |
271 | 346 <tag-name><literal>min_uses</literal></tag-name> |
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347 <tag-desc> |
966 | 348 sets the minimum number of file uses during the time |
271 | 349 defined by the <literal>inactive</literal> parameter |
966 | 350 to let the descriptor stay open in a cache; |
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351 by default, 1 |
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352 </tag-desc> |
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353 |
271 | 354 <tag-name><literal>valid</literal></tag-name> |
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355 <tag-desc> |
966 | 356 sets the time after which it should be checked that the file |
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357 still exists with the same name; by default, 60 seconds |
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358 </tag-desc> |
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359 |
271 | 360 <tag-name><literal>off</literal></tag-name> |
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361 <tag-desc> |
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362 disables caching |
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363 </tag-desc> |
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364 |
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365 </list> |
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366 </para> |
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367 |
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368 <para> |
966 | 369 Usage example: |
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370 <example> |
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371 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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372 </example> |
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373 </para> |
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374 |
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375 </directive> |
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376 |
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377 </section> |
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378 |
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Updated ngx_http_log_module documentation including translation into English.
Ruslan Ermilov <ru@nginx.com>
parents:
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379 </module> |