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<title>rotatelogs - Piped logging program to rotate Apache logs - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<body id="manual-page"><div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<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 2.5</a> > <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>rotatelogs - Piped logging program to rotate Apache logs</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/programs/rotatelogs.html" title="English"> en </a> |
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<a href="../ko/programs/rotatelogs.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
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<a href="../tr/programs/rotatelogs.html" hreflang="tr" rel="alternate" title="T<>rk<72>e"> tr </a></p>
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</div>
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<p><code>rotatelogs</code> is a simple program for use in
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conjunction with Apache's piped logfile feature. It supports
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rotation based on a time interval or maximum size of the log.</p>
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</div>
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<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#synopsis">Synopsis</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#portability">Portability</a></li>
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</ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
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<p><code><strong>rotatelogs</strong>
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[ -<strong>l</strong> ]
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[ -<strong>L</strong> <var>linkname</var> ]
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[ -<strong>p</strong> <var>program</var> ]
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[ -<strong>f</strong> ]
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[ -<strong>v</strong> ]
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[ -<strong>e</strong> ]
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[ -<strong>c</strong> ]
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<var>logfile</var>
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<var>rotationtime</var>|<var>filesize</var>(B|K|M|G)
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[ <var>offset</var> ]</code></p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="options" id="options">Options</a></h2>
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<dl>
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<dt><code>-l</code></dt>
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<dd>Causes the use of local time rather than GMT as the base for the
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interval or for <code>strftime(3)</code> formatting with size-based
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rotation.</dd>
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<dt><code>-L</code> <var>linkname</var></dt>
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<dd>Causes a hard link to be made from the current logfile
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to the specified link name. This can be used to watch
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the log continuously across rotations using a command like
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<code>tail -F linkname</code>.</dd>
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<dt><code>-p</code> <var>program</var></dt>
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<dd>If given, <code>rotatelogs</code> will execute the specified
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program every time a new log file is opened. The filename of the
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newly opened file is passed as the first argument to the program. If
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executing after a rotation, the old log file is passed as the second
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argument. <code>rotatelogs</code> does not wait for the specified
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program to terminate before continuing to operate, and will not log
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any error code returned on termination. The spawned program uses the
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same stdin, stdout, and stderr as rotatelogs itself, and also inherits
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the environment.</dd>
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<dt><code>-f</code></dt>
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<dd>Causes the logfile to be opened immediately, as soon as
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<code>rotatelogs</code> starts, instead of waiting for the
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first logfile entry to be read (for non-busy sites, there may be
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a substantial delay between when the server is started
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and when the first request is handled, meaning that the
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associated logfile does not "exist" until then, which
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causes problems from some automated logging tools)</dd>
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<dt><code>-t</code></dt>
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<dd>Causes the logfile to be truncated instead of rotated. This is
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useful when a log is processed in real time by a command like tail,
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and there is no need for archived data. No suffix will be added to
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the filename, however format strings containing '%' characters
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will be respected.
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</dd>
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<dt><code>-v</code></dt>
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<dd>Produce verbose output on STDERR. The output contains
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the result of the configuration parsing, and all file open and
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close actions.</dd>
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<dt><code>-e</code></dt>
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<dd>Echo logs through to stdout. Useful when logs need to be further
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processed in real time by a further tool in the chain.</dd>
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<dt><code>-c</code></dt>
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<dd>Create log file for each interval, even if empty.</dd>
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<dt><code><var>logfile</var></code></dt>
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<dd><p>The path plus basename of the logfile. If <var>logfile</var>
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includes any '%' characters, it is treated as a format string for
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<code>strftime(3)</code>. Otherwise, the suffix
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<var>.nnnnnnnnnn</var> is automatically added and is the time in
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seconds (unless the -t option is used). Both formats compute the
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start time from the beginning of the current period. For example,
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if a rotation time of 86400 is specified, the hour, minute, and
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second fields created from the <code>strftime(3)</code> format will
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all be zero, referring to the beginning of the current 24-hour
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period (midnight).</p>
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<p>When using <code>strftime(3)</code> filename formatting,
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be sure the log file format has enough granularity to produce
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a different file name each time the logs are rotated. Otherwise
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rotation will overwrite the same file instead of starting a new
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one. For example, if <var>logfile</var> was
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<code>/var/logs/errorlog.%Y-%m-%d</code> with log rotation at 5
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megabytes, but 5 megabytes was reached twice in the same day, the
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same log file name would be produced and log rotation would keep
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writing to the same file.</p>
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</dd>
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<dt><code><var>rotationtime</var></code></dt>
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<dd>The time between log file rotations in seconds. The rotation
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occurs at the beginning of this interval. For example, if the
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rotation time is 3600, the log file will be rotated at the beginning
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of every hour; if the rotation time is 86400, the log file will be
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rotated every night at midnight. (If no data is logged during an
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interval, no file will be created.)</dd>
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<dt><code><var>filesize</var>(B|K|M|G)</code></dt>
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<dd>The maximum file size in followed by exactly one of the letters
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<code>B</code> (Bytes), <code>K</code> (KBytes), <code>M</code> (MBytes)
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or <code>G</code> (GBytes).
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<p>
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When time and size are specified, the size must be given after the time.
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Rotation will occur whenever either time or size limits are reached.
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</p>
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</dd>
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<dt><code><var>offset</var></code></dt>
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<dd>The number of minutes offset from UTC. If omitted, zero is
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assumed and UTC is used. For example, to use local time in the zone
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UTC -5 hours, specify a value of <code>-300</code> for this argument.
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In most cases, <code>-l</code> should be used instead of specifying
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an offset.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="examples" id="examples">Examples</a></h2>
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<div class="example"><p><code>
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CustomLog "|bin/rotatelogs /var/logs/logfile 86400" common
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</code></p></div>
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<p>This creates the files /var/logs/logfile.nnnn where nnnn is
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the system time at which the log nominally starts (this time
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will always be a multiple of the rotation time, so you can
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synchronize cron scripts with it). At the end of each rotation
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time (here after 24 hours) a new log is started.</p>
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<div class="example"><p><code>
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CustomLog "|bin/rotatelogs -l /var/logs/logfile.%Y.%m.%d 86400" common
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</code></p></div>
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<p>This creates the files /var/logs/logfile.yyyy.mm.dd where
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yyyy is the year, mm is the month, and dd is the day of the month.
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Logging will switch to a new file every day at midnight, local time.</p>
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<div class="example"><p><code>
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CustomLog "|bin/rotatelogs /var/logs/logfile 5M" common
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</code></p></div>
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<p>This configuration will rotate the logfile whenever it reaches
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a size of 5 megabytes.</p>
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<div class="example"><p><code>
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ErrorLog "|bin/rotatelogs /var/logs/errorlog.%Y-%m-%d-%H_%M_%S 5M"
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</code></p></div>
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<p>This configuration will rotate the error logfile whenever it
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reaches a size of 5 megabytes, and the suffix to the logfile name
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will be created of the form
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<code>errorlog.YYYY-mm-dd-HH_MM_SS</code>.</p>
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<div class="example"><p><code>
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CustomLog "|bin/rotatelogs -t /var/logs/logfile 86400" common
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</code></p></div>
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<p>This creates the file /var/logs/logfile, truncating the file at
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startup and then truncating the file once per day. It is expected
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in this scenario that a separate process (such as tail) would
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process the file in real time.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="portability" id="portability">Portability</a></h2>
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<p>The following logfile format string substitutions should be
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supported by all <code>strftime(3)</code> implementations, see
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the <code>strftime(3)</code> man page for library-specific
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extensions.</p>
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<table class="bordered"><tr><td><code>%A</code></td><td>full weekday name (localized)</td></tr>
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<tr class="odd"><td><code>%a</code></td><td>3-character weekday name (localized)</td></tr>
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<tr><td><code>%B</code></td><td>full month name (localized)</td></tr>
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<tr class="odd"><td><code>%b</code></td><td>3-character month name (localized)</td></tr>
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<tr><td><code>%c</code></td><td>date and time (localized)</td></tr>
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<tr class="odd"><td><code>%d</code></td><td>2-digit day of month</td></tr>
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<tr><td><code>%H</code></td><td>2-digit hour (24 hour clock)</td></tr>
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<tr class="odd"><td><code>%I</code></td><td>2-digit hour (12 hour clock)</td></tr>
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<tr><td><code>%j</code></td><td>3-digit day of year</td></tr>
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<tr class="odd"><td><code>%M</code></td><td>2-digit minute</td></tr>
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<tr><td><code>%m</code></td><td>2-digit month</td></tr>
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<tr class="odd"><td><code>%p</code></td><td>am/pm of 12 hour clock (localized)</td></tr>
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<tr><td><code>%S</code></td><td>2-digit second</td></tr>
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<tr class="odd"><td><code>%U</code></td><td>2-digit week of year
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(Sunday first day of week)</td></tr>
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<tr><td><code>%W</code></td><td>2-digit week of year
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(Monday first day of week)</td></tr>
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<tr class="odd"><td><code>%w</code></td><td>1-digit weekday
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(Sunday first day of week)</td></tr>
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<tr><td><code>%X</code></td><td>time (localized)</td></tr>
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<tr class="odd"><td><code>%x</code></td><td>date (localized)</td></tr>
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<tr><td><code>%Y</code></td><td>4-digit year</td></tr>
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<tr class="odd"><td><code>%y</code></td><td>2-digit year</td></tr>
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<tr><td><code>%Z</code></td><td>time zone name</td></tr>
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<tr class="odd"><td><code>%%</code></td><td>literal `%'</td></tr>
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</table>
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</div></div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/programs/rotatelogs.html" title="English"> en </a> |
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<a href="../ko/programs/rotatelogs.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
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<a href="../tr/programs/rotatelogs.html" hreflang="tr" rel="alternate" title="T<>rk<72>e"> tr </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 2012 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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