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解决ntp的错误no server suitable for synchronization found

时间:2015-05-23 06:37:41      阅读:388      评论:0      收藏:0      [点我收藏+]


错误现象:

[root@magedu ~]# ntpdate 192.169.123.149

22 May 20:53:07 ntpdate[5580]: no server suitable for synchronization found


[root@magedu ~]# ntpdate -d 192.169.123.149

22 May 20:48:03 ntpdate[5487]: ntpdate 4.2.6p5@1.2349-o Wed Jun 18 21:20:36 UTC 2014 (1)

Looking for host 192.169.123.149 and service ntp

host found : 192-169-123-149-customer.oowvps.com

transmit(192.169.123.149)

transmit(192.169.123.149)

transmit(192.169.123.149)

transmit(192.169.123.149)

transmit(192.169.123.149)

192.169.123.149: Server dropped: no data

server 192.169.123.149, port 123

stratum 0, precision 0, leap 00, trust 000

refid [192.169.123.149], delay 0.00000, dispersion 64.00000

transmitted 4, in filter 4

reference time:    00000000.00000000  Mon, Jan  1 1900  7:36:42.000

originate timestamp: 00000000.00000000  Mon, Jan  1 1900  7:36:42.000

transmit timestamp:  d909a409.68167265  Fri, May 22 2015 20:48:09.406

filter delay:  0.00000  0.00000  0.00000  0.00000 

         0.00000  0.00000  0.00000  0.00000 

filter offset: 0.000000 0.000000 0.000000 0.000000

         0.000000 0.000000 0.000000 0.000000

delay 0.00000, dispersion 64.00000

offset 0.000000


22 May 20:48:11 ntpdate[5487]: no server suitable for synchronization found


错误原因:

(1)、检查ntp的版本,如果你使用的是ntp4.2(包括4.2)之后的版本,在restrict的定义中使用了notrust的话,会导致以上错误。


使用以下命令检查ntp的版本:

# ntpq -c version


下面是来自ntp官方网站的说明:

The behavior of notrust changed between versions 4.1 and 4.2.

In 4.1 (and earlier) notrust meant "Don‘t trust this host/subnet for time".

In 4.2 (and later) notrust means "Ignore all NTP packets that are not cryptographically authenticated." This forces remote time servers to authenticate themselves to your (client) ntpd


解决:把notrust去掉。


(2)、检查ntp server的防火墙。可能是server的防火墙屏蔽了upd 123端口。


可以用命令:

# service iptables stop

或者

# iptables -I INPUT -m udp -p udp --dport 123 -j ACCEPT


(3)、ntpdate命令后面的IP地址写错了。。。


本文出自 “Unix-like” 博客,请务必保留此出处http://alipay.blog.51cto.com/7119970/1654049

解决ntp的错误no server suitable for synchronization found

原文:http://alipay.blog.51cto.com/7119970/1654049

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