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Full Discussion: NTP sync problem
Operating Systems Linux Red Hat NTP sync problem Post 302370432 by uday123 on Wednesday 11th of November 2009 10:54:49 AM
Old 11-11-2009
NTP sync problem
Hi,

I have 4 machines and all are NTP configured with same ntp.conf file. But 3 machines are in sync with Time server and 4th machine is not contacting & sync with the NTP server. Please see the below details.

Code:
[root@LINUXSER01 ~]# service ntpd stop
Stopping ntpd:                                             [  OK  ]
[root@LINUXSER01 ~]# ntpdate -u NTPSERVER01
11 Nov 15:38:07 ntpdate[3010]: adjust time server 172.25.XX.XX offset -0.030428 sec
[root@LINUXSER01 ~]# service ntpd start
Starting ntpd:                                             [  OK  ]
[root@LINUXSER01 ~]# ntptime
ntp_gettime() returns code 5 (ERROR)
  time cea558ef.cbb0d000  Wed, Nov 11 2009 15:38:23.795, (.795667),
  maximum error 2064 us, estimated error 16 us
ntp_adjtime() returns code 5 (ERROR)
  modes 0x0 (),
  offset 0.000 us, frequency 0.000 ppm, interval 1 s,
  maximum error 2064 us, estimated error 16 us,
  status 0x40 (UNSYNC),
  time constant 0, precision 1.000 us, tolerance 512 ppm,
[root@LINUXSER01 ~]#


Output of ntpq -p command:
Code:
[root@LINUXSER01 ~]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 NTPSERVER01 192.168.xxx.xxx  3 u   57   64    1    1.155  -151.64   0.002
 NTPSERVER02 192.168.xxx.xxx  3 u   56   64    1    1.245  -151.70   0.002
[root@LINUXSER01 ~]#

/etc/ntp.conf file:
Code:
restrict default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
server NTPSERVER01
server NTPSERVER02
fudge   127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
keys /etc/ntp/keys
#log files
logconfig all
logfile /var/log/ntpd.log

ntpd log messages:

Code:
11 Nov 15:38:20 ntpd[3046]: system event 'event_restart' (0x01) status 'sync_alarm, sync_unspec, 1 event, event_unspec' (0xc010)
11 Nov 15:38:20 ntpd[3046]: peer 172.25.xx.xx event 'event_reach' (0x84) status 'unreach, conf, 1 event, event_reach' (0x8014)
11 Nov 15:38:21 ntpd[3046]: peer 192.168.xx.xx event 'event_reach' (0x84) status 'unreach, conf, 1 event, event_reach' (0x8014)

Please let me know if you need any other details to analyse the issue.
Please help me in resolving this issue.
 

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LEARN ABOUT OSF1

ntp.drift

ntp.drift(4)						     Kernel Interfaces Manual						      ntp.drift(4)

NAME

       ntp.drift - Network Time Protocol (NTP) drift file

DESCRIPTION

       When  the  NTP daemon (xntpd) is first started, it computes the error in the intrinsic frequency of the clock on the computer it is running
       on.  This process usually takes about a day or two after the daemon is started to compute a good estimate of this  (and	it  needs  a  good
       estimate to synchronize closely to its server).	Once the initial value is computed, it will change only by relatively small amounts during
       the course of continued operation.

       The driftfile declaration should always be included in the ntp.conf file.  This provides xntpd with complete path name to a file  in  which
       it can store the current value of the frequency error.  That way, if the daemon is stopped and restarted, it can reinitialize itself to the
       previous estimate without spending time recomputing the frequency estimate.

       The ntp.drift file contains one line with the following format: freq_offset flag Specifies the nominal frequency  offset.   DO  NOT  modify
       this  field.  Specifies the method used to improve system clock accuracy.  Specifies that xntpd runs a Phase-Locked Loop (PLL) algorithm to
       keep synchronized with other hosts.  This is the default.  Specifies the use of the  PLL  algorithm  in	the  kernel.   This  requires  the
       NTP_TIME kernel option.	After the option is configured in the kernel, edit the ntp.drift file and change the flag value to 1.

	      See System Administration for information on the NTP_TIME kernel option.

FILES

       Conventional name of the drift file

RELATED INFORMATION

       Commands: ntpdate(8), ntpq(8), xntpd(8), xntpdc(8)

       Files: ntp.conf(4)

       Network Administration, System Administration delim off

																      ntp.drift(4)
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