centos - Configure Linux server hardware buttons for soft reset or power cycle?

I have a small modest CentOS server at home. I run it
headless because anytime I access it, it's always via
SSH.

Anyways, tonight it became unresponsive to
the network. I could not connect to it to investigate. In this case, I have to hook up a
keyboard and monitor to see the problem. I ended up just rebooting
it.

But after this experience, I was wondering
if it's possible to configure the hardware buttons on the CPU case to perform a graceful
reboot or graceful power cycle in Linux. Even though the server becomes unresponsive
once in a blue moon, it would be nice to simply press a button and have it shutdown all
services and gracefully
reboot.

Anyone know how this could be
accomplished?

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