On Thu, Mar 26, 2015 at 7:44 AM, Lee Revell <rlrevell@xxxxxxxxx> wrote:
> I have a virtual test environment of an admin node and 3 mon + osd nodes,
> built by just following the quick start guide. It seems to work OK but ceph
> is constantly complaining about clock skew much greater than reality.
> Clocksource on the virtuals is kvm-clock and they also run ntpd.
>
> ceph-admin-node
> 26 Mar 10:35:29 ntpdate[2647]: adjust time server 91.189.94.4 offset
> 0.000802 sec
>
> ceph-node-1
> 26 Mar 10:35:35 ntpdate[4250]: adjust time server 91.189.94.4 offset
> 0.002537 sec
>
> ceph-node-2
> 26 Mar 10:35:42 ntpdate[1708]: adjust time server 91.189.94.4 offset
> -0.000214 sec
>
> ceph-node-3
> 26 Mar 10:35:49 ntpdate[1964]: adjust time server 91.189.94.4 offset
> 0.001490 sec
>
> ceph@ceph-admin-node:~/my-cluster$ ceph -w
> cluster db460aa2-5129-4aaa-8b2e-43eac727124e
> health HEALTH_WARN clock skew detected on mon.ceph-node-2
> monmap e3: 3 mons at
> {ceph-node-1=192.168.122.121:6789/0,ceph-node-2=192.168.122.131:6789/0,ceph-node-3=192.168.122.141:6789/0},
> election epoch 140, quorum 0,1,2 ceph-node-1,ceph-node-2,ceph-node-3
> mdsmap e54: 1/1/1 up {0=ceph-node-1=up:active}
> osdmap e182: 3 osds: 3 up, 3 in
> pgmap v3594: 840 pgs, 8 pools, 7163 MB data, 958 objects
> 29850 MB used, 27118 MB / 60088 MB avail
> 840 active+clean
What clock skews is it reporting? I don't remember the defaults, but
if ntp is consistently adjusting your clocks by a couple of
milliseconds then I don't think Ceph is going to be very happy about
it.
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