Summary

This Knowledgebase article provides information about how to configure Neverfail Heartbeat/ITCE to update BIND9 DNS servers when deployed in a WAN.

More Information

The utility NSUpdate used for updating the BIND9 DNS server must be installed on the Neverfail Heartbeat/ITCE server pair. This Knowledgebase article does not cover the installation or detail of the utility required by the vendor's DNS server. Additionally, this Knowledgebase article provides a sample script and the steps required to configure Neverfail Heartbeat to run the script.

1. Create a script that includes the following commands:
   
   NSUPDATE "update delete $HOSTNAME A\n";
   NSUPDATE "update add $HOSTNAME $TTL A $dnsip\n";
   
   Sample script to update BIND9 DNS servers:
   
   Note: It will be necessary to create a Transaction Signature (TSIG) to use the variable $keyfile as well as set the other variables.
   
   chdir ($KEYDIR);
   open (NSUPDATE, "| /usr/sbin/nsupdate -k $KEYFILE");
   print NSUPDATE "server $NAMESERVER\n";
   print NSUPDATE "update delete $HOSTNAME A\n";
   if ($dnsip ne 'NO') {
   print NSUPDATE "update add $HOSTNAME $TTL A $dnsip\n";
   }
   # print NSUPDATE "show\n";
   print NSUPDATE "send\n";
   close (NSUPDATE);
2. Create a Network Configuration Task via the Advanced Management Client using the steps below:
   1. Launch the Advanced Management Client.
   2. Click on the Application button.
   3. Select the Tasks tab.
   4. Click on the User Accounts button.
   5. Click the Add button.
   6. Enter the credentials for an account with rights to update the DNS (a member of the Administrators or Server Operators group on the target server).
   7. Click Ok , and then Close .
   8. Click the Add button to add a new task.
   9. Provide a descriptive name for the 'Task' (i.e. DNSUpdate).
   10. Select 'Network Configuration' for Task type.
   11. Select either Primary or Secondary for the server the task should run on as appropriate.
   12. In the Command field, enter the path to the previously configured script file.
   13. In the 'Run As' field select the appropriate user account from the drop down and then click Ok .

Applies To

Neverfail Heartbeat V5.3.0 and Later

Related Information

http://www.freebsdwiki.net/index.php/BIND,_dynamic_DNS,_failover_A_records

KBID-1599