Hi All, I have a test Cloudera Cluster composed by three servers(one with the cloudera manager and 2 data nodes). Sometime, but no more than twice a day, it happens that arrives an alert about Clock offset bad for a node. Once I log in into the server of the alert I have checked the service ntp with the command service ntp status and it seems to be  ok giving me this output telling me is running:  Oct 30 12:46:25 mbesrvcdrmw1.mbeitaly.mbe.lan ntpd[5586]: 0.0.0.0 0615 05 clock_sync Oct 30 12:46:26 mbesrvcdrmw1.mbeitaly.mbe.lan ntpd[5586]: 0.0.0.0 c618 08 no_sys_peer   I have tried to execute this command ntpq -np on all three servers and, for every one, there's in the output " * " in the beginning of a server line demonstrating the sync it's active.   I have also tried to restart the ntp service with service ntpd  restart and it seems to work but sometime the error reappears but spontaneously, after 15-20 minutes, fix itself automatically.   You can find in the attach the full output of these two commands.    Do you have any ideas about how to fix this matter permanently ?   Many thanks in advance   Stefano      ... View more