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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:01:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:01:30 +0000
commit6beeb1b708550be0d4a53b272283e17e5e35fe17 (patch)
tree1ce8673d4aaa948e5554000101f46536a1e4cc29 /docs/manual/programs/rotatelogs.html.en
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downloadapache2-6beeb1b708550be0d4a53b272283e17e5e35fe17.tar.xz
apache2-6beeb1b708550be0d4a53b272283e17e5e35fe17.zip
Adding upstream version 2.4.57.upstream/2.4.57upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<title>rotatelogs - Piped logging program to rotate Apache logs - Apache HTTP Server Version 2.4</title>
+<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">
+<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.4</p>
+<img alt="" src="../images/feather.png" /></div>
+<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>rotatelogs - Piped logging program to rotate Apache logs</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/programs/rotatelogs.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/programs/rotatelogs.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ko/programs/rotatelogs.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/programs/rotatelogs.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div>
+
+ <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>
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#synopsis">Synopsis</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#portability">Portability</a></li>
+</ul><h3>See also</h3><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
+
+ <p><code><strong>rotatelogs</strong>
+ [ -<strong>l</strong> ]
+ [ -<strong>L</strong> <var>linkname</var> ]
+ [ -<strong>p</strong> <var>program</var> ]
+ [ -<strong>f</strong> ]
+ [ -<strong>D</strong> ]
+ [ -<strong>t</strong> ]
+ [ -<strong>v</strong> ]
+ [ -<strong>e</strong> ]
+ [ -<strong>c</strong> ]
+ [ -<strong>n</strong> <var>number-of-files</var> ]
+ <var>logfile</var>
+ <var>rotationtime</var>|<var>filesize</var>(B|K|M|G)
+ [ <var>offset</var> ]</code></p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="options" id="options">Options</a></h2>
+
+<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.</dd>
+
+<dt><code>-L</code> <var>linkname</var></dt>
+<dd><p>Causes a hard link to be made from the current logfile
+to the specified link name. This can be used to watch
+the log continuously across rotations using a command like
+<code>tail -F linkname</code>.</p>
+<p>If the linkname is not an absolute
+path, it is relative to <code>rotatelogs</code>' working directory,
+which is the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> when
+<code>rotatelogs</code> is run by the server.
+</p>
+</dd>
+
+<dt><code>-p</code> <var>program</var></dt>
+
+<dd>If given, <code>rotatelogs</code> will execute the specified
+program every time a new log file is opened. The filename of the
+newly opened file is passed as the first argument to the program. If
+executing after a rotation, the old log file is passed as the second
+argument. <code>rotatelogs</code> does not wait for the specified
+program to terminate before continuing to operate, and will not log
+any error code returned on termination. The spawned program uses the
+same stdin, stdout, and stderr as rotatelogs itself, and also inherits
+the environment.</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>-D</code></dt>
+<dd>Creates the parent directories of the path that the log file will be
+placed in if they do not already exist. This allows <code>strftime(3)</code>
+formatting to be used in the path and not just the filename.</dd>
+
+<dt><code>-t</code></dt>
+<dd>Causes the logfile to be truncated instead of rotated. This is
+useful when a log is processed in real time by a command like tail,
+and there is no need for archived data. No suffix will be added to
+the filename, however format strings containing '%' characters
+will be respected.
+</dd>
+
+<dt><code>-T</code></dt>
+<dd>Causes all but the initial logfile to be truncated when opened.
+This is useful when the format string contains something that will
+loop around, such as the day of the month. Available in 2.4.56 and later.
+</dd>
+
+
+<dt><code>-v</code></dt>
+<dd>Produce verbose output on STDERR. The output contains
+the result of the configuration parsing, and all file open and
+close actions.</dd>
+
+<dt><code>-e</code></dt>
+<dd>Echo logs through to stdout. Useful when logs need to be further
+processed in real time by a further tool in the chain.</dd>
+
+<dt><code>-c</code></dt>
+<dd>Create log file for each interval, even if empty.</dd>
+
+<dt><code>-n <var>number-of-files</var></code></dt>
+<dd>Use a circular list of filenames without timestamps. This option overwrites
+log files at startup and during rotation. With -n 3, the series of log
+files opened would be "logfile", "logfile.1", "logfile.2", then overwriting
+"logfile".
+<br />
+When this program first opens "logfile", the file will only be truncated if <code>-t</code> is also provided. Every subsequent rotation will
+always begin with truncation of the target file. For size based rotation without <code>-t</code> and existing log files in place,
+this option may result in unintuitive behavior such as initial log entries being sent to "logfile.1", and entries in "logfile.1" not being preserved
+even if later "logfile.n" have not yet been used.
+<br />
+Available in 2.4.5 and later.</dd>
+
+<dt><code><var>logfile</var></code></dt>
+
+<dd><p>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 (unless the -t option is used). 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).</p>
+<p>When using <code>strftime(3)</code> filename formatting,
+be sure the log file format has enough granularity to produce
+a different file name each time the logs are rotated. Otherwise
+rotation will overwrite the same file instead of starting a new
+one. For example, if <var>logfile</var> was
+<code>/var/log/errorlog.%Y-%m-%d</code> with log rotation at 5
+megabytes, but 5 megabytes was reached twice in the same day, the
+same log file name would be produced and log rotation would keep
+writing to the same file.</p>
+<p>If the logfile is not an absolute
+path, it is relative to <code>rotatelogs</code>' working directory,
+which is the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> when
+<code>rotatelogs</code> is run by the server.
+</p>
+</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>(B|K|M|G)</code></dt>
+
+<dd>The maximum file size in followed by exactly one of the letters
+<code>B</code> (Bytes), <code>K</code> (KBytes), <code>M</code> (MBytes)
+or <code>G</code> (GBytes).
+<p>
+When time and size are specified, the size must be given after the time.
+Rotation will occur whenever either time or size limits are reached.
+</p>
+</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>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="examples" id="examples">Examples</a></h2>
+
+<div class="example"><pre class="prettyprint lang-config">CustomLog "|bin/rotatelogs /var/log/logfile 86400" common</pre>
+</div>
+
+ <p>This creates the files /var/log/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>
+
+<div class="example"><pre class="prettyprint lang-config">CustomLog "|bin/rotatelogs -l /var/log/logfile.%Y.%m.%d 86400" common</pre>
+</div>
+
+ <p>This creates the files /var/log/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>
+
+<div class="example"><pre class="prettyprint lang-config">CustomLog "|bin/rotatelogs /var/log/logfile 5M" common</pre>
+</div>
+
+ <p>This configuration will rotate the logfile whenever it reaches
+ a size of 5 megabytes.</p>
+
+<div class="example"><pre class="prettyprint lang-config">ErrorLog "|bin/rotatelogs /var/log/errorlog.%Y-%m-%d-%H_%M_%S 5M"</pre>
+</div>
+ <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>
+
+<div class="example"><pre class="prettyprint lang-config">CustomLog "|bin/rotatelogs -t /var/log/logfile 86400" common</pre>
+</div>
+
+ <p>This creates the file <code>/var/log/logfile</code>, truncating the file at
+ startup and then truncating the file once per day. It is expected
+ in this scenario that a separate process (such as tail) would
+ process the file in real time.</p>
+
+<div class="example"><pre class="prettyprint lang-config">CustomLog "|bin/rotatelogs -T /var/log/logfile.%d 86400" common</pre>
+</div>
+
+<p>If the server is started (or restarted) on the first of the month, this
+appends to <code>/var/log/logfile.01</code>. When a log entry is written on the
+second of the month, <code>/var/log/logfile.02</code> is truncated and new entries
+will be added to the top. This example keeps approximately 1 months worth of
+logs without external maintenance.</p>
+
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="portability" id="portability">Portability</a></h2>
+
+<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 class="bordered"><tr><td><code>%A</code></td><td>full weekday name (localized)</td></tr>
+<tr class="odd"><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 class="odd"><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 class="odd"><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 class="odd"><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 class="odd"><td><code>%M</code></td><td>2-digit minute</td></tr>
+<tr><td><code>%m</code></td><td>2-digit month</td></tr>
+<tr class="odd"><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 class="odd"><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 class="odd"><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 class="odd"><td><code>%x</code></td><td>date (localized)</td></tr>
+<tr><td><code>%Y</code></td><td>4-digit year</td></tr>
+<tr class="odd"><td><code>%y</code></td><td>2-digit year</td></tr>
+<tr><td><code>%Z</code></td><td>time zone name</td></tr>
+<tr class="odd"><td><code>%%</code></td><td>literal `%'</td></tr>
+</table>
+
+</div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/programs/rotatelogs.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/programs/rotatelogs.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ko/programs/rotatelogs.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/programs/rotatelogs.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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