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 Lee
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