At my work, we're using Amazon EC2 to host all services. The clock is set on our 'instances' by whatever machine the instance is running on -- as is usually the case with Xen. Were all the instances definitely on the same Xen host, I could be comfortable saying their clocks were synched pretty closely; but at present, that is not the case and it's not clear to me how close the clocks will be on instances across an EC2 data center (or across data centers). Is there a way to run NTP on two servers so that they can calculate their mutual time difference?
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