NTP as a client on VMs is sketchy at best. Make sure you follow the
documentation from both your hypervisor and OS vendors in order to get it to
behave as well as possible. I doubt I would trust a VM as an actual NTP
server, but it also likely depends on the sensitivity of the devices utilizing
those NTP servers. Certain protocols/software fail badly as soon as time is out
of sync even a few milliseconds (*cough* AD clients *cough*).
A lot of places offload NTP servers to their network devices. If you've got
sufficiently powerful physical networking hardware, you might try that.
- Chris
On Mon, 4 Apr 2016, Derek J. Balling wrote:
My experience is thus:
The misbehavior of NTP on a VM will happen "when you care most". When
the host is under resource constraints, clock cycles will be stolen from
some guests so that other more demanding guests can have them.
D
On 4/4/2016 12:18 PM, Jeremy Charles wrote:
I?m seeing all sort of documentation about how it?s not a great idea
to use a VM as an NTP server due to how sketchy time tracking is
within a VM.
My supervisor directed me to try it anyway. He feels that our
existing NTP servers are too old and need to be replaced, and he wants
to replace them with VMs rather than physical servers.
I?m not seeing any difference in behavior between the two existing
physical NTP servers and the VM that I set up to test as an NTP server.
Thoughts?
==
Jeremy Charles
Epic?s Computer and Technology Services Division
jchar...@epic.com
608-271-9000
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