NTP sync problem

Uday123 · 11-11-2009, 10:03 AM

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 ~]#

NTP configuration file : cat /etc/ntp.conf

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.

michaelk · 11-12-2009, 08:03 PM

Post the output of the command:
ntpq -c peer -c as -c rl

Until ntp "locks" onto a server the output of ntpq and ntptime will not show much info. Look at the output of ntpq -p does the reach value increment? It is an octal number and maxes out at 377.

Uday123 · 11-13-2009, 04:44 AM

Out of the command:

[root@LINUXSER01 ~]# ntpq -c peer -c as -c rl
remote refid st t when poll reach delay offset jitter
==============================================================================
NTPSERVER01 192.168.xx.xx 3 u 49 64 17 1.208 -999.90 863.435
NTPSERVER02 192.168.xx.xx 3 u 20 64 17 0.977 -1716.6 679.998
NTPSERVER03 192.168.xx.xx 3 u 13 64 37 1.050 -60.861 1609.52
NTPSERVER04 192.168.xx.xx 3 u 43 64 17 1.041 -2181.2 1198.64

ind assID status conf reach auth condition last_event cnt
===========================================================
1 17236 9024 yes yes none reject reachable 2
2 17237 9024 yes yes none reject reachable 2
3 17238 9024 yes yes none reject reachable 2
4 17239 9024 yes yes none reject reachable 2
assID=0 status=c035 sync_alarm, sync_unspec, 3 events, event_clock_reset,
version="ntpd 4.2.2p1@1.1570-o Wed Sep 3 14:28:29 UTC 2008 (1)",
processor="x86_64", system="Linux/2.6.18-128.el5", leap=11, stratum=16,
precision=-19, rootdelay=0.000, rootdispersion=4.140, peer=0,
refid=STEP, reftime=00000000.00000000 Thu, Feb 7 2036 6:28:16.000,
poll=4, clock=cea7b685.c8f5f3e1 Fri, Nov 13 2009 10:42:13.785, state=4,
offset=0.000, frequency=0.000, jitter=17.737, noise=0.002,
stability=0.000, tai=0
[root@LINUXSER01 ~]#

Please check and help me to fix this issue.

michaelk · 11-13-2009, 07:57 AM

Here is some good reading material.
http://www.eecis.udel.edu/~mills/ntp/html/debug.html