HUP signals to Unbound

[matt.will]

Been seeing this recently in the DHCP logs:

Sep 18 16:48:13 dhcpleases Sending HUP signal to dns daemon(37005)

After every DHCP transaction, it almost seems like DHCP is trying to kill DNS? I do have the option to register DHCP hostnames (dynamic and static) with Unbound, but not sure what warrants the HUP? Anyone have any ideas to enlighten me?

[RonpfS]

Some symptoms are explained there
https://forum.pfsense.org/index.php?topic=117570
https://forum.pfsense.org/index.php?topic=118092

[matt.will]

Definitely the first. I'm registering leases in Unbound. So I suppose this is expected then; once the ACK goes out, the hostname is registered and Unbound is reloaded?

[kpa]

Yes because Unbound can't otherwise update the host entries to make them available for resolving. It's a common UNIX methodology for services to reload configuration files on SIGHUP and ignore changes otherwise.