Re: How do you deal with "clock skew detected"?

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We setup 2 monitors as NTP server, and the other nodes are sync from monitors.

-----Mensaje original-----
De: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> En nombre de Richard Hesketh
Enviado el: miércoles, 15 de mayo de 2019 14:04
Para: ceph-users@xxxxxxxxxxxxxx
Asunto: Re:  How do you deal with "clock skew detected"?

Another option would be adding a boot time script which uses ntpdate (or
something) to force an immediate sync with your timeservers before ntpd starts - this is actually suggested in ntpdate's man page!

Rich

On 15/05/2019 13:00, Marco Stuurman wrote:
> Hi Yenya,
> 
> You could try to synchronize the system clock to the hardware clock 
> before rebooting. Also try chrony, it catches up very fast.
> 
> 
> Kind regards,
> 
> Marco Stuurman
> 
> 
> Op wo 15 mei 2019 om 13:48 schreef Jan Kasprzak <kas@xxxxxxxxxx 
> <mailto:kas@xxxxxxxxxx>>
> 
>             Hello, Ceph users,
> 
>     how do you deal with the "clock skew detected" HEALTH_WARN message?
> 
>     I think the internal RTC in most x86 servers does have 1 second resolution
>     only, but Ceph skew limit is much smaller than that. So every time I reboot
>     one of my mons (for kernel upgrade or something), I have to wait for several
>     minutes for the system clock to synchronize over NTP, even though ntpd
>     has been running before reboot and was started during the system
>     boot again.
> 
>     Thanks,
> 
>     -Yenya


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