1，设置A机时间服务器：
a,修改 /etc/ntp.conf，如下：
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
server 127.127.1.0 # local clock
#fudge 127.127.1.0 stratum 10
b,
/etc/init.d/ntpd start #启动时间服务器
service ntpd status
service ntpd start
c,
[root@cardapp1 etc]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*LOCAL(0) .LOCL. 5 l 59 64 377 0.000 0.000 0.000
d,chkconfig ntpd on #设置自启动
2，设置需同步的客户端机：
a,
修改 /etc/ntp.conf，如下：
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
server 200.4.0.40 # local clock 时间同步服务器A机
fudge 200.4.0.40 stratum 10
b,
service ntpd status
service ntpd start
c,(只有开了/etc/init.d/ntpd start，才能看到下面信息)
[root@webcard2 etc]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
200.4.0.40 LOCAL(0) 6 u 5 64 1 1.377 -7077.8 0.000
d,chkconfig ntpd on #设置自启动
e, ntpdate -d 200.4.0.40