Here is another method, where you use passwords. You could put the %hostdata hash in a config file if you wanted.

#!/usr/bin/perl
use strict;
use warnings;
use Net::SSH::Perl;

my %hostdata    = (
        'localhost' => {
                           user  => "zz",
                       password  => "ztest",
                       cmdtorun  => "ls -la",
                      misc_data  => [],
        },

   'zentara.zentara.net' => {
                               user  => "zz",
                           password  => "ztest",
                           cmdtorun  => "/usr/bin/uptime",
                          misc_data  => [],
        },
);

foreach my $host (keys %hostdata) {
    my $ssh = Net::SSH::Perl->new($host, port => 22);   #, debug => 1 
+); 
    $ssh->login($hostdata{$host}{user},$hostdata{$host}{password} );

    my ($out) = $ssh->cmd($hostdata{$host}{cmdtorun});
    print "$out\n";
}
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