I wrote a nagios plugin for monitoring the status of master/slave DNS.
Just to check if their serial number is the same. The script shows
below,thanks for all your directions.
#!/usr/bin/perl
use strict;
use Net::DNS;
use Getopt::Std;
my %opts;
getopts('hm:s:z:', \%opts);
if ($opts{'h'}) {
usage();
}
my $master = $opts{'m'} || usage();
my $slave = $opts{'s'} || usage();
my $zone = $opts{'z'} || usage();
my $s1 = qrsoa($master,$zone);
my $s2 = qrsoa($slave,$zone);
if ($s1 != -1 && $s1 == $s2) {
print "OK\n";
exit 0;
} else {
print "CRITICAL: zone game.yy.com sync error\n";
exit 2;
}
sub qrsoa {
my $host = shift;
my $zone = shift;
my $res = Net::DNS::Resolver->new(nameservers => [$host]);
my $query = $res->query($zone, "SOA");
return $query ? ($query->answer)[0]->serial : -1;
}
sub usage {
print <<EOF;
Usage: $0 -m 8.8.8.8 -s 8.8.4.4 -z example.com
-m master DNS ip or name
-s slave DNS ip or name
-z zone name
-h show this help page
EOF
exit 0;
}
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