I am setting up a dedicated mysql box, and I am not assigning any domain name to it, as it will be a backend server.
Can I set its ip address as its fully qualified hostname?
I am installing virtualmin and it requires a fully qualified hostname.
IP addresses are not any kind of hostname, fully-qualified or otherwise. But the software might accept the address regardless. Or you could take all of 15 seconds and add an entry to
An FQDN is the full domain name localized into the DNS hierarchy, for instance
An IP address is not a FQDN.
If your software requires you a FQDN please evaluate to add a record to your DNS server cache or to