Hello ,
We had the same problem upon resizing the machines via the azure portal.
Here are the steps to fix the issue :
- netstat -tulpn | grep 53 - Ensure unbound resolver is running.
- cat /var/lib/unbound/root.key - this file was empty which was the root cause of the issue.
- "unbound-anchor -v" - execute this command to populate the root.key file
- systemctl start unbound.service
- systemctl status unbound.service
- nslookup google.com