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<parentdocument href="./">Programs</parentdocument>

<title>rotatelogs - Piped logging program to rotate Apache logs</title>

<summary>

<p><code>rotatelogs</code> is a simple program for use in

conjunction with Apache's piped logfile feature. It supports

rotation based on a time interval or maximum size of the log.</p>

</summary>

<section id="synopsis"><title>Synopsis</title>

<p><code><strong>rotatelogs</strong>

[ -<strong>l</strong> ]

[ -<strong>f</strong> ]

<var>logfile</var>

<var>rotationtime</var>|<var>filesize</var>M

[ <var>offset</var> ]</code></p>

</section>

<section id="options"><title>Options</title>

<dl>

<dt><code>-l</code></dt>

<dd>Causes the use of local time rather than GMT as the base for the

interval or for <code>strftime(3)</code> formatting with size-based

rotation. Note that using <code>-l</code> in an environment which

changes the GMT offset (such as for BST or DST) can lead to unpredictable

results!</dd>

<dt><code>-f</code></dt>

<dd>Causes the logfile to be opened immediately, as soon as

<code>rotatelogs</code> starts, instead of waiting for the

first logfile entry to be read (for non-busy sites, there may be

a substantial delay between when the server is started

and when the first request is handled, meaning that the

associated logfile does not "exist" until then, which

causes problems from some automated logging tools)</dd>

<dt><code><var>logfile</var></code></dt>

<dd>The path plus basename of the logfile. If <var>logfile</var>

includes any '%' characters, it is treated as a format string for

<code>strftime(3)</code>. Otherwise, the suffix

<var>.nnnnnnnnnn</var> is automatically added and is the time in

seconds. Both formats compute the start time from the beginning of

the current period. For example, if a rotation time of 86400 is

specified, the hour, minute, and second fields created from the

<code>strftime(3)</code> format will all be zero, referring to the

beginning of the current 24-hour period (midnight).</dd>

<dt><code><var>rotationtime</var></code></dt>

<dd>The time between log file rotations in seconds. The rotation

occurs at the beginning of this interval. For example, if the

rotation time is 3600, the log file will be rotated at the beginning

of every hour; if the rotation time is 86400, the log file will be

rotated every night at midnight. (If no data is logged during an

interval, no file will be created.)</dd>

<dt><code><var>filesize</var>M</code></dt>

<dd>The maximum file size in megabytes followed by the letter

<code>M</code> to specify size rather than time.</dd>

<dt><code><var>offset</var></code></dt>

<dd>The number of minutes offset from UTC. If omitted, zero is

assumed and UTC is used. For example, to use local time in the zone

UTC -5 hours, specify a value of <code>-300</code> for this argument.

In most cases, <code>-l</code> should be used instead of specifying

an offset.</dd>

</dl>

</section>

<section id="examples"><title>Examples</title>

<example>

CustomLog "|bin/rotatelogs /var/logs/logfile 86400" common

</example>

<p>This creates the files /var/logs/logfile.nnnn where nnnn is

the system time at which the log nominally starts (this time

will always be a multiple of the rotation time, so you can

synchronize cron scripts with it). At the end of each rotation

time (here after 24 hours) a new log is started.</p>

<example>

CustomLog "|bin/rotatelogs -l /var/logs/logfile.%Y.%m.%d 86400" common

</example>

<p>This creates the files /var/logs/logfile.yyyy.mm.dd where

yyyy is the year, mm is the month, and dd is the day of the month.

Logging will switch to a new file every day at midnight, local time.</p>

<example>

CustomLog "|bin/rotatelogs /var/logs/logfile 5M" common

</example>

<p>This configuration will rotate the logfile whenever it reaches

a size of 5 megabytes.</p>

<example>

ErrorLog "|bin/rotatelogs /var/logs/errorlog.%Y-%m-%d-%H_%M_%S 5M"

</example>

<p>This configuration will rotate the error logfile whenever it

reaches a size of 5 megabytes, and the suffix to the logfile name

will be created of the form

<code>errorlog.YYYY-mm-dd-HH_MM_SS</code>.</p>

</section>

<section id="portability"><title>Portability</title>

<p>The following logfile format string substitutions should be

supported by all <code>strftime(3)</code> implementations, see

the <code>strftime(3)</code> man page for library-specific

extensions.</p>

<table border="1" style="zebra">

<tr><td><code>%A</code></td><td>full weekday name (localized)</td></tr>

<tr><td><code>%a</code></td><td>3-character weekday name (localized)</td></tr>

<tr><td><code>%B</code></td><td>full month name (localized)</td></tr>

<tr><td><code>%b</code></td><td>3-character month name (localized)</td></tr>

<tr><td><code>%c</code></td><td>date and time (localized)</td></tr>

<tr><td><code>%d</code></td><td>2-digit day of month</td></tr>

<tr><td><code>%H</code></td><td>2-digit hour (24 hour clock)</td></tr>

<tr><td><code>%I</code></td><td>2-digit hour (12 hour clock)</td></tr>

<tr><td><code>%j</code></td><td>3-digit day of year</td></tr>

<tr><td><code>%M</code></td><td>2-digit minute</td></tr>

<tr><td><code>%m</code></td><td>2-digit month</td></tr>

<tr><td><code>%p</code></td><td>am/pm of 12 hour clock (localized)</td></tr>

<tr><td><code>%S</code></td><td>2-digit second</td></tr>

<tr><td><code>%U</code></td><td>2-digit week of year

(Sunday first day of week)</td></tr>

<tr><td><code>%W</code></td><td>2-digit week of year

(Monday first day of week)</td></tr>

<tr><td><code>%w</code></td><td>1-digit weekday

(Sunday first day of week)</td></tr>

<tr><td><code>%X</code></td><td>time (localized)</td></tr>

<tr><td><code>%x</code></td><td>date (localized)</td></tr>

<tr><td><code>%Y</code></td><td>4-digit year</td></tr>

<tr><td><code>%y</code></td><td>2-digit year</td></tr>

<tr><td><code>%Z</code></td><td>time zone name</td></tr>

<tr><td><code>%%</code></td><td>literal `%'</td></tr>

</table>

</section>

</manualpage>