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15 <p class="apache">Apache HTTP Server Version 2.3</p>
16 <img alt="" src="../images/feather.gif" /></div>
17 <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
19 <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.3</a> > <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>rotatelogs - Piped logging program to rotate Apache logs</h1>
21 <p><span>Available Languages: </span><a href="../en/programs/rotatelogs.html" title="English"> en </a> |
22 <a href="../ko/programs/rotatelogs.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
25 <p><code>rotatelogs</code> is a simple program for use in
26 conjunction with Apache's piped logfile feature. It supports
27 rotation based on a time interval or maximum size of the log.</p>
29 <div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#synopsis">Synopsis</a></li>
30 <li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
31 <li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
32 <li><img alt="" src="../images/down.gif" /> <a href="#portability">Portability</a></li>
34 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
36 <h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
38 <p><code><strong>rotatelogs</strong>
39 [ -<strong>l</strong> ]
40 [ -<strong>f</strong> ]
41 [ -<strong>v</strong> ]
43 <var>rotationtime</var>|<var>filesize</var>(B|K|M|G)
44 [ <var>offset</var> ]</code></p>
45 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
47 <h2><a name="options" id="options">Options</a></h2>
51 <dt><code>-l</code></dt>
52 <dd>Causes the use of local time rather than GMT as the base for the
53 interval or for <code>strftime(3)</code> formatting with size-based
54 rotation. Note that using <code>-l</code> in an environment which
55 changes the GMT offset (such as for BST or DST) can lead to unpredictable
58 <dt><code>-f</code></dt>
59 <dd>Causes the logfile to be opened immediately, as soon as
60 <code>rotatelogs</code> starts, instead of waiting for the
61 first logfile entry to be read (for non-busy sites, there may be
62 a substantial delay between when the server is started
63 and when the first request is handled, meaning that the
64 associated logfile does not "exist" until then, which
65 causes problems from some automated logging tools)</dd>
67 <dt><code>-v</code></dt>
68 <dd>Produce verbose output on STDERR. The output contains
69 the result of the configuration parsing, and all file open and
72 <dt><code><var>logfile</var></code></dt>
74 <dd>The path plus basename of the logfile. If <var>logfile</var>
75 includes any '%' characters, it is treated as a format string for
76 <code>strftime(3)</code>. Otherwise, the suffix
77 <var>.nnnnnnnnnn</var> is automatically added and is the time in
78 seconds. Both formats compute the start time from the beginning of
79 the current period. For example, if a rotation time of 86400 is
80 specified, the hour, minute, and second fields created from the
81 <code>strftime(3)</code> format will all be zero, referring to the
82 beginning of the current 24-hour period (midnight).</dd>
84 <dt><code><var>rotationtime</var></code></dt>
86 <dd>The time between log file rotations in seconds. The rotation
87 occurs at the beginning of this interval. For example, if the
88 rotation time is 3600, the log file will be rotated at the beginning
89 of every hour; if the rotation time is 86400, the log file will be
90 rotated every night at midnight. (If no data is logged during an
91 interval, no file will be created.)</dd>
93 <dt><code><var>filesize</var>(B|K|M|G)</code></dt>
95 <dd>The maximum file size in followed by exactly one of the letters
96 <code>B</code> (Bytes), <code>K</code> (KBytes), <code>M</code> (MBytes)
97 or <code>G</code> (GBytes).
99 When time and size are specified, the size must be given after the time.
100 Rotation will occur whenever either time or size limits are reached.
104 <dt><code><var>offset</var></code></dt>
106 <dd>The number of minutes offset from UTC. If omitted, zero is
107 assumed and UTC is used. For example, to use local time in the zone
108 UTC -5 hours, specify a value of <code>-300</code> for this argument.
109 In most cases, <code>-l</code> should be used instead of specifying
113 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
114 <div class="section">
115 <h2><a name="examples" id="examples">Examples</a></h2>
117 <div class="example"><p><code>
118 CustomLog "|bin/rotatelogs /var/logs/logfile 86400" common
121 <p>This creates the files /var/logs/logfile.nnnn where nnnn is
122 the system time at which the log nominally starts (this time
123 will always be a multiple of the rotation time, so you can
124 synchronize cron scripts with it). At the end of each rotation
125 time (here after 24 hours) a new log is started.</p>
127 <div class="example"><p><code>
128 CustomLog "|bin/rotatelogs -l /var/logs/logfile.%Y.%m.%d 86400" common
131 <p>This creates the files /var/logs/logfile.yyyy.mm.dd where
132 yyyy is the year, mm is the month, and dd is the day of the month.
133 Logging will switch to a new file every day at midnight, local time.</p>
135 <div class="example"><p><code>
136 CustomLog "|bin/rotatelogs /var/logs/logfile 5M" common
139 <p>This configuration will rotate the logfile whenever it reaches
140 a size of 5 megabytes.</p>
142 <div class="example"><p><code>
143 ErrorLog "|bin/rotatelogs /var/logs/errorlog.%Y-%m-%d-%H_%M_%S 5M"
145 <p>This configuration will rotate the error logfile whenever it
146 reaches a size of 5 megabytes, and the suffix to the logfile name
147 will be created of the form
148 <code>errorlog.YYYY-mm-dd-HH_MM_SS</code>.</p>
150 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
151 <div class="section">
152 <h2><a name="portability" id="portability">Portability</a></h2>
154 <p>The following logfile format string substitutions should be
155 supported by all <code>strftime(3)</code> implementations, see
156 the <code>strftime(3)</code> man page for library-specific
159 <table class="bordered"><tr><td><code>%A</code></td><td>full weekday name (localized)</td></tr>
160 <tr class="odd"><td><code>%a</code></td><td>3-character weekday name (localized)</td></tr>
161 <tr><td><code>%B</code></td><td>full month name (localized)</td></tr>
162 <tr class="odd"><td><code>%b</code></td><td>3-character month name (localized)</td></tr>
163 <tr><td><code>%c</code></td><td>date and time (localized)</td></tr>
164 <tr class="odd"><td><code>%d</code></td><td>2-digit day of month</td></tr>
165 <tr><td><code>%H</code></td><td>2-digit hour (24 hour clock)</td></tr>
166 <tr class="odd"><td><code>%I</code></td><td>2-digit hour (12 hour clock)</td></tr>
167 <tr><td><code>%j</code></td><td>3-digit day of year</td></tr>
168 <tr class="odd"><td><code>%M</code></td><td>2-digit minute</td></tr>
169 <tr><td><code>%m</code></td><td>2-digit month</td></tr>
170 <tr class="odd"><td><code>%p</code></td><td>am/pm of 12 hour clock (localized)</td></tr>
171 <tr><td><code>%S</code></td><td>2-digit second</td></tr>
172 <tr class="odd"><td><code>%U</code></td><td>2-digit week of year
173 (Sunday first day of week)</td></tr>
174 <tr><td><code>%W</code></td><td>2-digit week of year
175 (Monday first day of week)</td></tr>
176 <tr class="odd"><td><code>%w</code></td><td>1-digit weekday
177 (Sunday first day of week)</td></tr>
178 <tr><td><code>%X</code></td><td>time (localized)</td></tr>
179 <tr class="odd"><td><code>%x</code></td><td>date (localized)</td></tr>
180 <tr><td><code>%Y</code></td><td>4-digit year</td></tr>
181 <tr class="odd"><td><code>%y</code></td><td>2-digit year</td></tr>
182 <tr><td><code>%Z</code></td><td>time zone name</td></tr>
183 <tr class="odd"><td><code>%%</code></td><td>literal `%'</td></tr>
187 <div class="bottomlang">
188 <p><span>Available Languages: </span><a href="../en/programs/rotatelogs.html" title="English"> en </a> |
189 <a href="../ko/programs/rotatelogs.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
190 </div><div id="footer">
191 <p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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