ROTATELOGS(8)                      rotatelogs                      ROTATELOGS(8)

       rotatelogs - Piped logging program to rotate Apache logs

       rotatelogs [ -l ] [ -L linkname ] [ -p program ] [ -f ] [ -t ] [ -v ] [
       -e ] [ -c ] [ -n number-of-files ] logfile rotationtime|filesize(B|K|M|G)
       [ offset ]

       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.

       -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.

       -L linkname
              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 tail -F

       -p program
              If given, rotatelogs 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.
              rotatelogs 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

       -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)

       -t     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.

       -v     Produce verbose output on STDERR. The output contains the result
              of the configuration parsing, and all file open and close actions.

       -e     Echo logs through to stdout. Useful when logs need to be further
              processed in real time by a further tool in the chain.

       -c     Create log file for each interval, even if empty.

       -n number-of-files
              Use a circular list of filenames without timestamps. With -n 3,
              the series of log files opened would be "logfile", "logfile.1",
              "logfile.2", then overwriting "logfile". Available in 2.4.5 and


              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.)

              The maximum file size in followed by exactly one of the letters B
              (Bytes), K (KBytes), M (MBytes) or G (GBytes). .PP When time and
              size are specified, the size must be given after the time.
              Rotation will occur whenever either time or size limits are

       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/log/logfile 86400" common

       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

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

       This creates the files /var/log/ 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/log/logfile 5M" common

       This configuration will rotate the logfile whenever it reaches a size of
       5 megabytes.

            ErrorLog "|bin/rotatelogs /var/log/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.

            CustomLog "|bin/rotatelogs -t /var/log/logfile 86400" common

       This creates the file /var/log/logfile, 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.

       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 `%'

Apache HTTP Server                 2015-01-01                      ROTATELOGS(8)