guys, in whm, do we need restart DNS Server (BIND/NSD) after Graceful Server Reboot?
because sometime i cant access my site or subdomain after Graceful Server Reboot (but not always), sometime its ok just do Graceful Server Reboot, no need restart DNS Server (BIND/NSD) again
how is it guys, what we need to do after Graceful Server Reboot actually, there is no instruction to restart DNS Server (BIND/NSD) again after that in whm manual

I presume its down too the booting process. named or httpd may not start due to some complication and it is skipped.

so what else i need to do after do a Graceful Server Reboot?

technically if it is setup correctly in your startup files, then you would not have to do anything after a graceful reboot.
Chris

What you will find with a cPanel server is after a reboot, Service manager or "Server Status" shows several services as failed.
You will probably find they are all online and running well. Give it 10 - 15 minutes and it will update itself.
After a graceful reboot, you shouldn't need to do anything.

hmm i had graceful restart my server again, but afterthat i cant access some of my website, i must restart DNS Server (BIND/NSD), then all website is showing again,
why i must always restart DNS Server (BIND/NSD) after graceful restart ....
anybody know?

You should make sure that all the services are enabled in the Service Manager in whm. That is a very common reason why services don't auto start upon bootup.