Re: Clock skew

[Sean Crosby <scrosby@xxxxxxxxxxxxxx>]

Hi Dominique,

The clock skew warning shows up when your NTP daemon is not synced.

You can see the sync in the output of ntpq -p

This is a synced NTP

# ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter

==============================================================================

 ntp.unimelb.edu 210.9.192.50     2 u   24   64   17    0.496   -6.421   0.181

*ntp2.unimelb.ed 202.6.131.118    2 u   26   64   17    0.613  -11.998   0.250

 ntp41.frosteri. .INIT.          16 u    -   64    0    0.000    0.000   0.000

 dns01.ntl02.pri .INIT.          16 u    -   64    0    0.000    0.000   0.000

 cosima.470n.act .INIT.          16 u    -   64    0    0.000    0.000   0.000

 x.ns.gin.ntt.ne .INIT.          16 u    -   64    0    0.000    0.000   0.000

The *'s show that there is a sync with a NTP server. When you start or restart ntp, it takes a while for a sync to occur

Here's immediately after restarting the ntp daemon

# ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter

==============================================================================

 ntp.unimelb.edu 210.9.192.50     2 u    -   64    1    0.496   -6.421   0.000

 ntp2.unimelb.ed 202.6.131.118    2 u    -   64    1    0.474  -11.678   0.000

 ntp41.frosteri. .INIT.          16 u    -   64    0    0.000    0.000   0.000

 dns01.ntl02.pri .INIT.          16 u    -   64    0    0.000    0.000   0.000

 cosima.470n.act .INIT.          16 u    -   64    0    0.000    0.000   0.000

 x.ns.gin.ntt.ne .INIT.          16 u    -   64    0    0.000    0.000   0.000

Make sure that nothing is regularly restarting ntpd. For us, we had puppet and dhcp regularly fight over the contents of ntp.conf, and it caused a restart of ntpd.

Sean

On Wed, 15 Aug 2018 at 19:37, Dominque Roux <dominique.roux@xxxxxxxxxxx> wrote:

Hi all,

We recently facing clock skews from time to time.
This means that sometimes everything is fine but hours later the warning
appears again.

NTPD is running and configured with the same pool.

Did someone else already had the same issue and could probably help us
to fix this?

Thanks a lot!

Dominique
--

Your Swiss, Open Source and IPv6 Virtual Machine. Now on
www.datacenterlight.ch

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