[ntp:questions] running NTP as server only

Rob nomail at example.com
Thu Aug 19 14:48:59 UTC 2010


unruh <unruh at wormhole.physics.ubc.ca> wrote:
> On 2010-08-19, Rob <nomail at example.com> wrote:
>> unruh <unruh at wormhole.physics.ubc.ca> wrote:
>>> On 2010-08-19, Rob <nomail at example.com> wrote:
>>>> unruh <unruh at wormhole.physics.ubc.ca> wrote:
>>>>> On 2010-08-17, folkert <folkert at vanheusden.com> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> Is it possible to run the NTP daemon only as a server and not as a
>>>>>> local-clock maintainer?
>>>>>> Reason: I have a virtual machine which gets its time via the vmware
>>>>>> tooling from the hardware server it is running on. Now this virtual
>>>>>> machine needs to distribute the time to clients.
>>>>>
>>>>> Aarrgdaagh. Why would you have a virtual machine, with its remarkably
>>>>> unreliabl e clock serve its time to others?
>>>>
>>>> Some companies are virtualizing all their hardware.
>>>> E.g. this is happening where I work as well.  All the servers have
>>>> been replaced by a number of Vmware ESX machines.
>>>> So there is no physical hardware machine left to run as the ntp server.
>>>
>>> uh, to quote Landauer, all information is physical. All virtual machines
>>> MUST also run on physical machines.
>>
>> But that does not mean you can run NTP on them.
>>
>> E.g. on VMware ESX, you cannot do this.
>> (there is an NTP running on the console session, but that is just a
>> virtual machine running a Linux variant, it is not running on the
>> physical machine either)
>
> An OS on a physical machine running virtual servers really should be
> able to discipline the physical clock on the  system. It is like saying
> that the physical machine has no way of accessing disks.Control of
> physical hardware ( and I consider clocks physicsl hardware) should be
> the responsibility of the base OS. But my strictures probably do not
> help you.

You seem to talk a lot about VMware, without knowing a thing about it.
Do you think that those comments help the people that ask the questions?




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