# vi /etc/ntp.conf
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org
#server 1.centos.pool.ntp.org
#server 2.centos.pool.ntp.org
server -4 ntp.nict.jp
server -4 ntp1.jst.mfeed.ad.jp
server -4 ntp2.jst.mfeed.ad.jp
# rm -f /etc/localtime
# cp -p /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
# clock --systohc
# date
Fri Feb 1 11:07:41 JST 2012
# ntpdate ntp.nict.jp
1 Feb 11:08:08 ntpdate[11521]: the NTP socket is in use, exiting
# /etc/init.d/ntpd start
# chkconfig ntpd on
# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*ntp-a3.nict.go. .NICT. 1 u 17 256 377 13.034 -0.355 0.531
+ntp1.jst.mfeed. 210.173.176.4 2 u 149 256 377 12.094 0.584 0.565
+ntp2.jst.mfeed. 210.173.176.4 2 u 218 256 377 13.017 0.108 0.076
LOCAL(0) .LOCL. 10 l 16 64 377 0.000 0.000 0.001