Comments on Writing a Perl Daemon

A perl daemon
Matteo un esempio
The easiest way is to use Proc::Daemon.

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#!/usr/bin/perl

use strict;
use warnings;
use Proc::Daemon;

Proc::Daemon::Init;

my $continue = 1;
$SIG{TERM} = sub { $continue = 0 };

while ($continue) {
#do stuff
}
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Alternately you could do all of the things Proc::Daemon does:
Fork a child and exits the parent process.
Become a session leader (which detaches the program from the controlling terminal).
Fork another child process and exit first child. This prevents the potential of acquiring a controlling terminal.
Change the current working directory to "/".
Clear the file creation mask.
Close all open file descriptors.
Integrating with the runlevel system is easy. You need a script like the following (replace XXXXXXXXXXXX with the Perl script's name, YYYYYYYYYYYYYYYYYYY with a description of what it does, and /path/to with path to the Perl script) in /etc/init.d. Since you are using CentOS, once you have the script in /etc/init.d, you can just use chkconfig to turn it off or on in the various run levels..