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
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