the nix Kid

In case you're providing DNS hosting in any form chances are one day you'll notice your syslog is flooded with messages like

Jan 12 17:34:27 pry-ns-vm1 named[6774]: client 74.125.xx.yy#41026: query (cache) 'deleted_domain.tld/A/IN' denied

Jan 12 17:34:27 pry-ns-vm1 named[6774]: client 74.125.xx.yy#56524: query (cache) 'deleted_domain.tld/A/IN' denied

Jan 12 17:34:28 pry-ns-vm1 named[6774]: client 61.50.zz.nn#51215: query (cache) 'deleted_domain.tld/A/IN' denied

Jan 12 17:34:29 pry-ns-vm1 named[6774]: client 61.50.zz.nn#49405: query (cache) 'deleted_domain.tld/A/IN' denied

This may be fixed with by adding following to your BIND config (as a top level section):

logging {
    category security { null; };
    channel default_syslog {
        syslog daemon;
        severity warning;
    };
};