NSX manager is generating "DNS lookup failed for Manager node" alarm.

Products

• VMware NSX

Issue/Introduction

NSX manager is generating following alarms for DNS lookup and reverse DNS lookup.

1. DNS lookup failed for Manager node <uuid> with FQDN <fqdn> and the publish_fqdns flag was set.
2. Reverse DNS lookup failed for Manager node <uuid> with IP address <ip-address> and the publish_fqdns flag was set.

Command nslookup generates correct output but dig fails. Output of 'dig <fqdn>' and 'dig -x <ip>' may not contain 'answer section'.

Environment

VMware NSX-T Data Center, VMware NSX

Cause

DNS server is not replying to request.

Resolution

If dig does not provide correct output then it points to issue with DNS server.

Check if DNS server is receiving and replying to DNS query.

Additional Information

When publish_fqdns flag is set, the /usr/bin/dig command runs periodically for FQDN resolution. The priority of the commands is dig, nslookup and 'usr/bin/getent hosts'.