rotatelogs - Piped logging program to rotate Apache logs
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rotatelogs 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.
rotatelogs
[ -l ]
[ -f ]
logfile
rotationtime|filesizeM
[ offset ]
-l- Causes the use of local time rather than GMT as the base for the
interval or for
strftime(3) formatting with size-based
rotation. Note that using -l in an environment which
changes the GMT offset (such as for BST or DST) can lead to unpredictable
results!
-f- Causes the logfile to be opened immediately, as soon as
rotatelogs 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).
Available in version 2.2.9 and later.
logfile- The path plus basename of the logfile. If logfile
includes any '%' characters, it is treated as a format string for
strftime(3). Otherwise, the suffix
.nnnnnnnnnn 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
strftime(3) format will all be zero, referring to the
beginning of the current 24-hour period (midnight).
rotationtime- 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.)
filesizeM- The maximum file size in megabytes followed by the letter
M to specify size rather than time.
offset- 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
-300 for this argument.
In most cases, -l should be used instead of specifying
an offset.
CustomLog "|bin/rotatelogs /var/logs/logfile 86400" common
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.
CustomLog "|bin/rotatelogs -l /var/logs/logfile.%Y.%m.%d 86400" common
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.
CustomLog "|bin/rotatelogs /var/logs/logfile 5M" common
This configuration will rotate the logfile whenever it reaches
a size of 5 megabytes.
ErrorLog "|bin/rotatelogs /var/logs/errorlog.%Y-%m-%d-%H_%M_%S 5M"
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
errorlog.YYYY-mm-dd-HH_MM_SS.
The following logfile format string substitutions should be
supported by all strftime(3) implementations, see
the strftime(3) man page for library-specific
extensions.
%A | full weekday name (localized) |
%a | 3-character weekday name (localized) |
%B | full month name (localized) |
%b | 3-character month name (localized) |
%c | date and time (localized) |
%d | 2-digit day of month |
%H | 2-digit hour (24 hour clock) |
%I | 2-digit hour (12 hour clock) |
%j | 3-digit day of year |
%M | 2-digit minute |
%m | 2-digit month |
%p | am/pm of 12 hour clock (localized) |
%S | 2-digit second |
%U | 2-digit week of year
(Sunday first day of week) |
%W | 2-digit week of year
(Monday first day of week) |
%w | 1-digit weekday
(Sunday first day of week) |
%X | time (localized) |
%x | date (localized) |
%Y | 4-digit year |
%y | 2-digit year |
%Z | time zone name |
%% | literal `%' |
