[CentOS] chronyd configuration as a local ntp server

[Phil Amy]

Robert,
If your NTP server will be on 7/24, I would uninstall chrony and install
ntpd which is still included in CentOS 7.  Configure as usual.

For the differences between chrony and ntpd reference:
http://thegeekdiary.com/centos-rhel-7-chrony-vs-ntp-differences-between-ntpd-and-chronyd/

Essentially, chrony is more for laptops with intermittant network
connections, and ntpd is better suited to always-on servers