# File lib/openshift-origin-dns-bind/lib/openshift/bind_plugin.rb, line 68
    def deregister_namespace(namespace)
      # create a TXT record for the namespace in the domain
      fqdn = "#{namespace}.#{@domain_suffix}"
      # enable updates with key
      dns.tsig = @keyname, @keyvalue

      update = Dnsruby::Update.new(@zone)
      update.delete(fqdn, 'TXT')
      dns.send_message(update)
    end