# File lib/openshift-origin-dns-bind/lib/openshift/bind_plugin.rb, line 90
    def deregister_application(app_name, namespace)
      begin
        # delete the CNAME record for the application in the domain
        fqdn = "#{app_name}-#{namespace}.#{@domain_suffix}"
  
        # We know we only have one CNAME per app, so look it up
        # We need it for the delete
        # should be an error if there's not exactly one answer
        current = dns.query(fqdn, 'CNAME')
        cnamevalue = current.answer[0].rdata.to_s        
  
        # enable updates with key
        dns.tsig = @keyname, @keyvalue
        update = Dnsruby::Update.new(@zone)
        update_response = update.delete(fqdn, 'CNAME', cnamevalue)
        send_response = dns.send_message(update)
      rescue Dnsruby::NXDomain
        Rails.logger.debug "DEBUG: BIND: Could not find CNAME for #{fqdn} to delete"
      end
    end