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Steps:
Check for correct timezone (EDT):
$ date
If you need to change timezone:
$ setup Timezone configuration America/New_York
Clear "System clock uses UTC."
Install RPMs. NTP depends on libcap:
$ rpm -ivh libcap-1.10-12.i386.rpm $ rpm -ivh ntp-4.1.1-1.i386.rpm
Configure NTP prior to start. See here for stratum 2 time servers: Using ntp with Red Hat Linux/Fedora
$ cd /etc/ntp $ vi ntpservers clock.redhat.com clock2.redhat.com $ vi step-tickers clock.redhat.com
Set NTPD to start after reboot:
$ chkconfig ntpd on
Verify that NTPD is set for runlevel 5.
$ chkconfig --list
Startup NTPD, verifying change in time:
# verify EDT, note "before" time. $ date $ service ntpd start # test, note "after" time. $ date