[Freeipa-users] ntpd frequency error xxx PPM exceeds tolerance 500 PPM

[Prasun Gera]

The hardware is not very old (ivybridge). The entries appear every few
minutes in the log. The /etc/ntp.conf has not been modified manually. It
lists 3 servers - 0.rhel.pool.ntp.org, 1 and 2. At the end, there are also
a couple of additional local servers with the comment added by
/sbin/dhclient-script. The replica on the same network with an identical
ntp.conf file doesn't have these messages in the current log. However, if I
go back to a week, I see similar messages there too.  The ping to public
ntp servers varies from to a few ms to ~50 ms. The ping to local servers is
under 1 ms. I followed steps from the first link (ntpd -qg), and the
messages have stopped for now, but I suspect that they will reappear later.
That's what happened last time I tried that solution. This is the output
from ntpq -pn on the master:

     remote           refid      st t when poll reach   delay   offset
 jitter
==============================================================================
+38.229.71.1     204.123.2.5      2 u   39   64  377   44.300  -1311.8
7.668
+64.6.144.6      128.252.19.1     2 u   25   64  377   38.184  -1327.6
 12.615
-129.250.35.251  200.98.196.212   2 u   30   64  377   14.649  -1318.8
7.079
 127.127.1.0     .LOCL.          10 l    -   64    0    0.000    0.000
0.000
*localnetip1  localnetref1  2 u   55   64  377    0.349  -1316.0   8.264
-localnetip2  localnetref2    3 u   64   64  377    0.459  -1309.6  10.516


On Thu, Sep 10, 2015 at 5:27 AM, Andrew Holway <andrew.holway at gmail.com>
wrote:

> If could be the server is trying to access the time server over a heavily
> congested network which could cause these types of problems.
>
>
> How old is the hardware?
> How often to these entries appear in the log?
> What is the ping / traceroute to the time server you are using?
> Are there any other machines on the same local network that are using this
> timeserver? Do they have problems?
>
>
>
>
> On 10 September 2015 at 14:18, Prasun Gera <prasun.gera at gmail.com> wrote:
>
>> So I did a bit of googling and tinker panic 0 only makes sense for
>> virtual machines. Is there any way to confirm if it is indeed a hardware
>> issue ?
>>
>> On Thu, Sep 10, 2015 at 5:16 AM, Andrew Holway <andrew.holway at gmail.com>
>> wrote:
>>
>>> Thats odd. You would normally not need it on bare metal. It could be
>>> broken hardware.
>>>
>>> On 10 September 2015 at 14:05, Prasun Gera <prasun.gera at gmail.com>
>>> wrote:
>>>
>>>> Thanks. I'm not virtualizing though. Should I still add it ?
>>>>
>>>> On Thu, Sep 10, 2015 at 5:02 AM, Andrew Holway <andrew.holway at gmail.com
>>>> > wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I assume you are virtualising.
>>>>>
>>>>> Try adding "tinker panic 0" to /etc/ntp.conf.
>>>>>
>>>>> It should make it tolerant to heavily drifting virtual clocks.
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Andrew
>>>>>
>>>>> On 10 September 2015 at 13:46, Prasun Gera <prasun.gera at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> OS: RHEL 7.1 w IDM
>>>>>>
>>>>>> I'm seeing these messages in my master's log messages. I don't know
>>>>>> if it's related, but I think I started seeing them after I set up a
>>>>>> replica. Everything seems to be working fine, but I'm worried that things
>>>>>> will break if delta grows beyond a point. I tried steps in
>>>>>> https://access.redhat.com/solutions/35640, but it didn't really
>>>>>> help. The messages still appear regularly in the log.
>>>>>>
>>>>>> --
>>>>>> Manage your subscription for the Freeipa-users mailing list:
>>>>>> https://www.redhat.com/mailman/listinfo/freeipa-users
>>>>>> Go to http://freeipa.org for more info on the project
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>
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