No Xenserver NTP peers listed

The default NTP servers have been configured for our three XenServer hosts:

Network Time

I next used the ntpq utility to display a list of NTP peers known to the server:

ntpq -p

Using the command line ntpq -p on each of the XenServer hosts returned the following peers:

[root@xen01 ~]# ntpq -p
      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*robert.elnounch 213.251.128.249  2 u  618 1024  377   10.361   -2.166   0.112
-probe.vaygr.net 194.29.130.252   2 u  993 1024  377   23.783   -5.053   0.163
+fra.pionica.com 212.244.36.228   2 u  993 1024  377   10.160   -1.079   0.470
+ntp1.monshouwer 193.79.237.14    2 u   91 1024  377   13.685   -0.979   0.964
LOCAL(0)        .LOCL.           10 l   22   64  377    0.000    0.000   0.001

[root@xen02 ~]# ntpq -p      
remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*LOCAL(0)        .LOCL.          10 l   15   64  377    0.000    0.000   0.001 

[root@xen03 ~]# ntpq -p      
remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*LOCAL(0)        .LOCL.          10 l   59   64  377    0.000    0.000   0.001

Xen02 and Xen03 (Poolmaster) did not return any external peers. I restarted the NTP service using the following command line:

/etc/init.d/ntpd restart

Now when I ran ntpq -p on each of the XenServer hosts, the following peers are now listed.

Restart NTP service

2 thoughts on “No Xenserver NTP peers listed

Add yours

  1. No, none of the changes we made to NTP or to the HA value has resolved the XenServer Pool master rebooting problem.

    For the moment we have disbaled HA. This has stopped the server from fencing and we have not experienced any more problems since. The fix? On the 14the May 2012 we plan to perform a XenServer upgrade from Citrix XenServer 5.6 fp1 to XenServer 5.6 SP2 to see if this will fix the problem.

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