dhcpleases error in system log

[emammadov]

Hello,
I see this errors in my system logs. Why did this happen?
Oct 12 11:55:24 dhcpleases Could not deliver signal HUP to process because its pidfile (/var/run/unbound.pid) does not exist, No such process.

[Veldkornet]

This post is deleted!

[emammadov]

Do anyone knows why this error happens?

[Gertjan]

dhcpleases is a process that "copies" local DHCP leases to a file that unbound (the DNS resolver) uses to resolve local devices.
dhcpleases forces unbound to reload by HUPping it.

What happens is : "dhcpleases" decides to tell "unbound" to reload, and uses unboud's PID file. The PID file doesn't exists ... which means unbound isn't running (is already restarting) ? dhcpleases complains about this.
This can happen : unbound is a rather stupid program (btw : this is my opinion) and has to be restarted to have the changed config read in again. But shouldn't happen that often.
The message isn't a show-stopper.

Check how often your unbound restarts in the log file.

Btw :

Uncheck DHCP Regsitration (and make all your DHCP leases "static" with their mAC value)
Check "Static DHCP".

This will calm down unbound restarting.

[emammadov]

Thank you for your reply. If I uncheck DHCP Registration, then will I be able to enter the servers and etc with their hostname, not with their ip address?

My screenshot:

[Gertjan]

@emammadov said in dhcpleases error in system log:

DHCP Registration

When "DHCP Registration" is checked, on every incoming (new) lease, the dhcpleases process will restart unbound.
This is a very know subject on this forum btw.

You have many devices ? unbound will get hail-stormed.

So, as said above, create "DHCP Static Mappings" (DHCP Server page) for all you devices (or : the ones that need to be resolved) and you'll be fine, or at least : better.

[emammadov]

Thank you very much for your comprehensive answer. It is highly appreciated.