Chapter 19. Configuring NTP Using ntpd Red Hat Enterprise Linux …
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-configuring_ntp_using_ntpd
WEBTo enable the service to run at system start, issue the following command as root : ~]# systemctl enable ntpdate. In Red Hat Enterprise Linux 7 the default /etc/ntp/step-tickers file contains 0.rhel.pool.ntp.org. To configure additional ntpdate servers, using a text editor running as root, edit /etc/ntp/step-tickers.
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