Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_log_module.xml @ 1851:9463f1412255
Documented ngx_google_perftools_module.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Mon, 05 Dec 2016 21:01:46 +0300 |
parents | 19eb203ffd41 |
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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) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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8 |
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9 <module name="Module ngx_stream_log_module" |
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10 link="/en/docs/stream/ngx_stream_log_module.html" |
589 | 11 lang="en" |
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12 rev="3"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 The <literal>ngx_stream_log_module</literal> module (1.11.4) writes session logs |
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18 in the specified format. |
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19 </para> |
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20 |
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21 </section> |
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22 |
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23 |
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24 <section id="example" name="Example Configuration"> |
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25 |
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26 <para> |
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27 <example> |
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28 log_format basic '$remote_addr [$time_local] ' |
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29 '$protocol $status $bytes_sent $bytes_received ' |
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30 '$session_time'; |
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31 |
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32 access_log /spool/logs/nginx-access.log basic buffer=32k; |
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33 </example> |
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34 </para> |
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35 |
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36 </section> |
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37 |
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38 |
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39 <section id="directives" name="Directives"> |
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40 |
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41 <directive name="access_log"> |
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42 <syntax> |
364 | 43 <value>path</value> |
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44 <value>format</value> |
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45 [<literal>buffer</literal>=<value>size</value>] |
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46 [<literal>gzip[=<value>level</value>]</literal>] |
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47 [<literal>flush</literal>=<value>time</value>] |
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48 [<literal>if</literal>=<value>condition</value>]</syntax> |
271 | 49 <syntax><literal>off</literal></syntax> |
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50 <default>off</default> |
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51 <context>stream</context> |
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52 <context>server</context> |
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53 |
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54 <para> |
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55 Sets the path, <link id="log_format">format</link>, |
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56 and configuration for a buffered log write. |
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57 Several logs can be specified on the same level. |
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58 Logging to <link doc="../syslog.xml">syslog</link> |
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59 can be configured by specifying |
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60 the “<literal>syslog:</literal>” prefix in the first parameter. |
364 | 61 The special value <literal>off</literal> cancels all |
62 <literal>access_log</literal> directives on the current level. | |
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63 </para> |
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64 |
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65 <para> |
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66 If either the <literal>buffer</literal> or <literal>gzip</literal> |
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67 parameter is used, writes to log will be buffered. |
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68 <note> |
966 | 69 The buffer size must not exceed the size of an atomic write to a disk file. |
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70 For FreeBSD this size is unlimited. |
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71 </note> |
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72 </para> |
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73 |
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74 <para> |
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75 When buffering is enabled, the data will be written to the file: |
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76 <list type="bullet"> |
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77 |
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78 <listitem> |
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79 if the next log line does not fit into the buffer; |
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80 </listitem> |
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81 |
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82 <listitem> |
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83 if the buffered data is older than specified by the <literal>flush</literal> |
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84 parameter; |
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85 </listitem> |
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86 |
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87 <listitem> |
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88 when a worker process is <link doc="../control.xml">re-opening</link> log |
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89 files or is shutting down. |
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90 </listitem> |
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91 |
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92 </list> |
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93 </para> |
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94 |
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95 <para> |
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96 If the <literal>gzip</literal> parameter is used, then the buffered data will |
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97 be compressed before writing to the file. |
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98 The compression level can be set between 1 (fastest, less compression) |
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99 and 9 (slowest, best compression). |
966 | 100 By default, the buffer size is equal to 64K bytes, and the compression level |
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101 is set to 1. |
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102 Since the data is compressed in atomic blocks, the log file can be decompressed |
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103 or read by “<literal>zcat</literal>” at any time. |
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104 </para> |
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105 |
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106 <para> |
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107 Example: |
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108 <example> |
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109 access_log /path/to/log.gz basic gzip flush=5m; |
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110 </example> |
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111 </para> |
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112 |
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113 <para> |
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114 <note> |
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115 For gzip compression to work, nginx must be built with the zlib library. |
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116 </note> |
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117 </para> |
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118 |
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119 <para> |
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120 The file path can contain variables, |
224
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121 but such logs have some constraints: |
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122 <list type="bullet"> |
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123 |
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124 <listitem> |
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125 the <link doc="../ngx_core_module.xml" id="user"/> |
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126 whose credentials are used by worker processes should |
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127 have permissions to create files in a directory with |
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128 such logs; |
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129 </listitem> |
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130 |
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131 <listitem> |
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132 buffered writes do not work; |
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133 </listitem> |
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134 |
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135 <listitem> |
966 | 136 the file is opened and closed for each log write. |
224
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137 However, since the descriptors of frequently used files can be stored |
966 | 138 in a <link id="open_log_file_cache">cache</link>, writing to the old file |
139 can continue during the time specified by the <link id="open_log_file_cache"/> | |
140 directive’s <literal>valid</literal> parameter | |
224
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141 </listitem> |
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142 |
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143 </list> |
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144 </para> |
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145 |
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146 <para> |
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147 The <literal>if</literal> parameter enables conditional logging. |
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148 A session will not be logged if the <value>condition</value> evaluates to “0” |
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149 or an empty string. |
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150 </para> |
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151 |
224
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152 </directive> |
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153 |
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154 |
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155 <directive name="log_format"> |
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156 <syntax> |
271 | 157 <value>name</value> |
158 <value>string</value> ...</syntax> | |
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159 <default></default> |
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160 <context>stream</context> |
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161 |
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162 <para> |
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163 Specifies the log format, for example: |
224
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164 <example> |
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165 log_format proxy '$remote_addr [$time_local] ' |
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166 '$protocol $status $bytes_sent $bytes_received ' |
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167 '$session_time "$upstream_addr" ' |
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168 '"$upstream_bytes_sent" "$upstream_bytes_received" "$upstream_connect_time"'; |
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169 </example> |
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170 </para> |
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171 |
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172 </directive> |
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173 |
364 | 174 |
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175 <directive name="open_log_file_cache"> |
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176 |
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177 <syntax> |
271 | 178 <literal>max</literal>=<value>N</value> |
179 [<literal>inactive</literal>=<value>time</value>] | |
180 [<literal>min_uses</literal>=<value>N</value>] | |
181 [<literal>valid</literal>=<value>time</value>]</syntax> | |
182 <syntax><literal>off</literal></syntax> | |
224
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183 <default>off</default> |
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184 <context>stream</context> |
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185 <context>server</context> |
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186 |
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187 <para> |
966 | 188 Defines a cache that stores the file descriptors of frequently used logs |
224
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189 whose names contain variables. |
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190 The directive has the following parameters: |
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191 <list type="tag"> |
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192 |
271 | 193 <tag-name><literal>max</literal></tag-name> |
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194 <tag-desc> |
966 | 195 sets the maximum number of descriptors in a cache; |
196 if the cache becomes full the least recently used (LRU) | |
224
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197 descriptors are closed |
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198 </tag-desc> |
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199 |
271 | 200 <tag-name><literal>inactive</literal></tag-name> |
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201 <tag-desc> |
966 | 202 sets the time after which the cached descriptor is closed |
224
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203 if there were no access during this time; |
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204 by default, 10 seconds |
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205 </tag-desc> |
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206 |
271 | 207 <tag-name><literal>min_uses</literal></tag-name> |
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208 <tag-desc> |
966 | 209 sets the minimum number of file uses during the time |
271 | 210 defined by the <literal>inactive</literal> parameter |
966 | 211 to let the descriptor stay open in a cache; |
224
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212 by default, 1 |
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213 </tag-desc> |
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214 |
271 | 215 <tag-name><literal>valid</literal></tag-name> |
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216 <tag-desc> |
966 | 217 sets the time after which it should be checked that the file |
224
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218 still exists with the same name; by default, 60 seconds |
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219 </tag-desc> |
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220 |
271 | 221 <tag-name><literal>off</literal></tag-name> |
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222 <tag-desc> |
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223 disables caching |
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224 </tag-desc> |
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225 |
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226 </list> |
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227 </para> |
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228 |
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229 <para> |
966 | 230 Usage example: |
224
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231 <example> |
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232 open_log_file_cache max=1000 inactive=20s valid=1m min_uses=2; |
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233 </example> |
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234 </para> |
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235 |
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236 </directive> |
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237 |
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238 </section> |
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239 |
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240 </module> |