[ntp:questions] [help]how to configure ntp in a private network and without extra refer clock source?

David Woolley david at ex.djwhome.demon.invalid
Mon Jul 14 08:31:28 UTC 2014

On 14/07/14 06:51, john.wang.wjq at gmail.com wrote:
> I'm trying to do the same thing in an isolated network, except that
> me
have around 60 kvm nodes running on 20 physical Linux boxes. Out of them
I'm trying to use 3 or 4 boxes as my NTP servers to form a HA time service.

You are trying to do two undesirable things at once:  run a a time 
island; and directly update the clocks on VM guests.  I don't think this 
should be attempted without individual consultancy from someone with 
detailed knowledge of the VM system in use.

Generally, the recommended way of handling time islands these days is to 
use a core network which peer each other and which use orphan mode to 
allow isolated operation.  These should be chosen to have good and 
accurate clocks against UTC when free running.

The general approach for VMs is to synchronise the hosts and then use 
whatever mechanism the VM environment provides to synchronised the 
guests, possibly with the occasional resynch.  You should advice from 
the VM environment provider as to how best to do this on their systems.

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