No need for PID files if you don't daemonize the main process - systemd works best if the process doesn't daemonize. Systemd should be able to manage all children just fine and all you should need is a simple fork:

my @children;
foreach my $server (@servers) {
    my $child = fork;
    die "Fork error" unless defined($child);
    if ($child) {
        push @children, $child;
    } else {
        do_stuff($server);
    }
}
waitpid($_) for @children;
[download]

The waitpid line will cause the main process to wait for all children before exiting (this is what systemd will use to know if any tasks are still running). You should be able to kill all remaining (stuck) processes using systemctl stop my-service (or if you want just a periodic run, periodically call systemctl restart my-service).

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.