NTP服务器不准确

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请教各位老师：

搭建NTP服务器，发现时间不准确且时差无规律

OS: CentOS 5.3

NTP:ntpq 4.2.2p1@1.1570-o Thu Jan 22 02:51:31 UTC 2009 (1)

[root@localhost ntp]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
clock.tl.fukuok .GPS.            1 u  156   64   34   73.683  88983.1 4448041
114.80.81.69    209.81.9.7       2 u   24   64    7   48.525  309852. 117238.
114.80.81.1     209.81.9.7       2 u   20   64   25   55.111  6380437 6140755
221.130.196.230 192.43.244.18    2 u   27   64   37   70.016  234339. 3074800
*LOCAL(0)        .LOCL.          10 l   23   64   37    0.000    0.000   0.001

[root@localhost ntp]# ntpstat
synchronised to local net at stratum 11
   time correct to within 448 ms
   polling server every 64 s


/etc/ntp.conf

1. 
   
2. [root@localhost etc]# cat /etc/ntp.conf
   
3. # Permit time synchronization with our time source, but do not
   
4. # permit the source to query or modify the service on this system.
   
5. restrict default kod nomodify notrap nopeer noquery
   
6. restrict -6 default kod nomodify notrap nopeer noquery
   
7. # Permit all access over the loopback interface.  This could
   
8. # be tightened as well, but to do so would effect some of
   
9. # the administrative functions.
   
10. restrict 127.0.0.1
    
11. #restrict -6 ::1
    
12. # Hosts on local network are less restricted.
    
13. #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
    
14. restrict 172.16.1.0 mask 255.255.255.0 nomodify
    
15. # Use public servers from the pool.ntp.org project.
    
16. # Please consider joining the pool (http://www.pool.ntp.org/join.html).
    
17. 
    
18. server 0.centos.pool.ntp.org
    
19. server 1.centos.pool.ntp.org
    
20. server 2.centos.pool.ntp.org
    
21. #broadcast 192.168.1.255 key 42         # broadcast server
    
22. #broadcastclient                        # broadcast client
    
23. #broadcast 224.0.1.1 key 42             # multicast server
    
24. #multicastclient 224.0.1.1              # multicast client
    
25. #manycastserver 239.255.254.254         # manycast server
    
26. #manycastclient 239.255.254.254 key 42  # manycast client
    
27. # Undisciplined Local Clock. This is a fake driver intended for backup
    
28. # and when no outside source of synchronized time is available.
    
29. server  127.127.1.0     # local clock
    
30. fudge   127.127.1.0 stratum 10
    
31. # Drift file.  Put this in a directory which the daemon can write to.
    
32. # No symbolic links allowed, either, since the daemon updates the file
    
33. # by creating a temporary in the same directory and then rename()'ing
    
34. # it to the file.
    
35. driftfile /var/lib/ntp/drift
    
36. # Key file containing the keys and key identifiers used when operating
    
37. # with symmetric key cryptography.
    
38. keys /etc/ntp/keys
    
39. # Specify the key identifiers which are trusted.
    
40. #trustedkey 4 8 42
    
41. # Specify the key identifier to use with the ntpdc utility.
    
42. #requestkey 8
    
43. # Specify the key identifier to use with the ntpq utility.
    
44. #controlkey 8
    
45. 
    
46. 
    
47. 
    

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[root@localhost etc]# cat /etc/sysconfig/clock

1. # The ZONE parameter is only evaluated by system-config-date.
   
2. # The timezone of the system is defined by the contents of /etc/localtime.
   
3. ZONE="Asia/Shanghai"
   
4. UTC=false
   
5. #UTC=true
   
6. ARC=false

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qmailer

ding ~~~~~~

kenduest

你在 vmware 這類環境跑系統嗎？

kns1024wh

最后的方式是这个时间服务器与互联网上的时间服务器进行时间的同步 并同时校正BIOS的时钟
ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*218.75.4.130    209.81.9.7       2 u  243 1024  377  283.288   -6.066   1.195
221.130.196.230 209.81.9.7       2 u  191 1024  377  163.524  -264.23   3.922
LOCAL(0)        .LOCL.          10 l   53   64  377    0.000    0.000   0.001

时间的误差 于时区选择 有一定的关系的