ntplinux使用,linuxntp使用

---服务器端

[oracle&＃64;node1:/home/oracle]#more /etc/ntp.conf

server 127.127.1.0

fudge 127.127.1.0 stratum 8

driftfile /var/lib/ntp/drift

broadcastdelay 0.0008

--客户端

[root&＃64;node2 ~]# more /etc/ntp.conf

server 192.168.10.21 prefer

driftfile /var/lib/ntp/drift

broadcastdelay 0.008

----客户端和服务器都启动ntp

[root&＃64;node1:/etc/]#service ntpd start

Starting ntpd:                                             [  OK  ]

[root&＃64;node2 ~]# service ntpd start

Starting ntpd:                                             [  OK  ]

---首次时钟同步之前

[oracle&＃64;node1:/home/oracle]#ssh node2 date;date

Thu Sep 11 21:58:03 CST 2014

Thu Sep 11 21:58:01 CST 2014

客户端停止ntp服务&＃xff0c;并等三五分钟都在进行首次时钟同步

[root&＃64;node2 ~]# service ntpd stop

Shutting down ntpd:                                        [  OK  ]

[root&＃64;node2 ~]# ntpdate 192.168.10.21

11 Sep 21:59:13 ntpdate[10950]: step time server 192.168.10.21 offset -2.455153 sec

[root&＃64;node2 ~]# service ntpd start

Starting ntpd:                                             [  OK  ]

---时钟同步之后

[oracle&＃64;node1:/home/oracle]#ssh node2 date;date

Thu Sep 11 21:59:34 CST 2014

Thu Sep 11 21:59:34 CST 2014

如果有问题可以用这个命令查看

[root&＃64;node2 ~]# ntpdate -d 192.168.10.21

11 Sep 21:56:30 ntpdate[10713]: ntpdate 4.2.2p1&＃64;1.1570-o Thu Nov 26 11:35:07 UTC 2009 (1)

Looking for host 192.168.10.21 and service ntp

host found : node1

transmit(192.168.10.21)

receive(192.168.10.21)

transmit(192.168.10.21)

receive(192.168.10.21)

transmit(192.168.10.21)

receive(192.168.10.21)

transmit(192.168.10.21)

receive(192.168.10.21)

transmit(192.168.10.21)

server 192.168.10.21, port 123

stratum 9, precision -20, leap 00, trust 000

refid [192.168.10.21], delay 0.02592, dispersion 0.00008

transmitted 4, in filter 4

reference time:    d7bc2857.2d44dc93  Thu, Sep 11 2014 21:55:35.176

originate timestamp: d7bc288d.4a7d86ad  Thu, Sep 11 2014 21:56:29.290

transmit timestamp:  d7bc288e.5b6cdf26  Thu, Sep 11 2014 21:56:30.357

filter delay:  0.02592  0.02599  0.02612  0.02596

0.00000  0.00000  0.00000  0.00000

filter offset: -1.06622 -1.06634 -1.06628 -1.06634

0.000000 0.000000 0.000000 0.000000

delay 0.02592, dispersion 0.00008

offset -1.066229

11 Sep 21:56:30 ntpdate[10713]: step time server 192.168.10.21 offset -1.066229 sec

为了使NTP服务可以在系统引导的时候自动启动&＃xff0c;执行&＃xff1a;

# chkconfig ntpd on

配置了服务端后(并启动SSH)在客户端用&＃xff1a;

# Crontab -e

*/5 * * * * /usr/sbin/ntpdate 192.168.8.240

>/dev/null 2>&1