Ubuntu Manpage: Log::Agent::Rotate - parameters for logfile rotation

Provided by: liblog-agent-rotate-perl_1.201-1_all

NAME

       Log::Agent::Rotate - parameters for logfile rotation

SYNOPSIS

        require Log::Agent::Rotate;

        my $policy = Log::Agent::Rotate->make(
            -backlog     => 7,
            -unzipped    => 2,
            -is_alone    => 0,
            -max_size    => 100_000,
            -max_time    => "1w",
            -file_perm   => 0666
        );

DESCRIPTION

The "Log::Agent::Rotate" class holds the parameters describing the logfile rotation policy, and is meant
to be supplied to instances of "Log::Agent::Driver::File" via arguments in the creation routine, such as
"-rotate", or by using array references as values in the "-channels" hashref: See complementary
information in Log::Agent::Driver::File.

As rotation cycles are performed, the current logfile is renamed, and possibly compressed, until the
maximum backlog is reached, at which time files are deleted. Assuming a backlog of 5 and that the latest
2 files are not compressed, the following files can be present on the filesystem:

logfile # the current logfile
logfile.0 # most recently renamed logfile
logfile.1
logfile.2.gz
logfile.3.gz
logfile.4.gz # oldest logfile, unlinked next cycle

The following switches are available to the creation routine make(), listed in alphabetical order, all
taking a single integer value as argument:

backlog
The total amount of old logfiles to keep, besides the current logfile.

Defaults to 7.

file_perm
The file permissions, given as an octal integer value, to supply to sysopen() during file creation.
This value is modified during execution by the umask of the process. In most cases, it is good
practice to leave this set to the default and let the user process controll the file permissions.

This option has no effect on Win32 systems.

Defaults to 0666.

is_alone
The argument is a boolean stating whether the program writing to the logfile will be the only one or
not. This is a hint that drives some optimizations, but it is up to the program to guarantee that
noone else will be able to write to or unlink the current logfile when set to true.

Defaults to false.

max_size
The maximum logfile size. This is a threshold, which will cause a logfile rotation cycle to be
performed, when crossed after a write to the file. If set to 0, this threshold is not checked.

Defaults to 1 megabyte.

max_time
The maximum time in seconds between the moment we opened the file and the next rotation cycle occurs.
This threshold is only checked after a write to the file.

The value can also be given as a string, postfixed by one of the following letters to specify the
period unit (e.g. "3w"):

Letter Unit
------ -------
m minutes
h hours
d days
d days
w weeks
M months (30 days of 24 hours)
y years

Defaults to 0, meaning it is not checked.

max_write
The maximum amount of data we can write to the logfile. Like "max_size", this is a threshold, which
is only checked after a write to the logfile. This is not the total logfile size: if several
programs write to the same logfile and "max_size" is not used, then the logfiles may never be rotated
at all if none of the programs write at least "max_write" bytes to the logfile before exiting.

Defaults to 0, meaning it is not checked.

single_host
The argument is a boolean stating whether the access to the logfiles will be made from one single
host or not. This is a hint that drives some optimizations, but it is up to the program to guarantee
that it is accurately set.

Defaults to false, which is always a safe value.

unzipped
The amount of old logfiles, amongst the most recent ones, that should not be compressed but be kept
as plain files.

Defaults to 1.

To test whether two configurations are strictly identical, use is_same(), as in:

print "identical\n" if $x->is_same($y);

where both $x and $y are "Log::Agent::Rotate" objects.

All the aforementioned switches also have a corresponding querying routine that can be issued on
instances of the class to get their value. It is not possible to modify those attributes.

For instance:

my $x = Log::Agent::Rotate->make(...);
my $mwrite = $x->max_write();

would get the configured max_write threshold.

AUTHORS

       Originally written by Raphael Manfredi (Raphael_Manfredi@pobox.com), currently maintained by Mark Rogaski
       (mrogaski@cpan.org).

       Thanks to Chris Meshkin for his suggestions on file permissions.

COPYRIGHT

       Copyright (c) 2000, Raphael Manfredi.

       Copyright (c) 2002-2015, Mark Rogaski; all rights reserved.

       This program is free software; you can redistribute it and/or modify it under the terms of  the  Artistic
       License 2.0, a copy of which can be found with perl.

       This  program  is  distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Artistic License 2.0
       for more details.

       http://www.perlfoundation.org/artistic_license_2_0

NAME

SYNOPSIS

DESCRIPTION

AUTHORS

COPYRIGHT

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