Why does ntpd not start automatically in RHEL 7?

Issue

• NTP sync issue on RHEL 7
• I have a problem with ntpd, it does not start automatically, when the system boots.

• On RHEL 7, ntp was installed, started, and set to Enable on boot. Right now, ntpd is working but, upon reboot, it did not start automatically:

  # systemctl status ntpd
  ntpd.service - Network Time Service
     Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)
     Active: inactive (dead)
  

• We are seeing that ntpd.service is misbehaving. When we restart it, it comes UP and abruptly goes down with no apparent pattern to it.