dhcp server IP pool monitoring

[Sten Carlsen]

On 14/03/14 20.27, John Wobus wrote:
>
> I trust Linux a bit less though:
> interactively, I've closed a file with vi, then
> ran a program that appeared to miss the change.
> Would vi(m) manage to exit without any synch
> happening?  (I've never noticed anything
> equivalent with dhcpd lease file handling.)
I have seen editors setting a modify time a bit into the future,
resulting that some sync SW misses that update.
Not sure about VI though.
>
>
> John Wobus
> Cornell University IT
>
> On Mar 13, 2014, at 5:54 AM, Simon Hobson wrote:
>
>> "Capriccio, Peter" <peter.capriccio at hp.com> wrote:
>>
>>> All of the solutions that parse the lease file can never be 100%
>>> accurate because the real "stuff" is taking place in memory, is it not?
>>
>> No, for any RFC compliant package, the leases file (or equivalent) on
>> disk will accurately reflect any leases before they are offered to
>> the client. This is certainly the case with the ISC DHCP server - all
>> lease information is written to the leases file and synced to disk
>> before the lease is offered to the client*
>>
>> Worst case is that the lease file lags in-memory information by a few
>> seconds.
>>
>>
>> * Though I believe the current version has a config option to delay
>> this a little for performance ?
>>
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-- 
Best regards

Sten Carlsen

No improvements come from shouting:

       "MALE BOVINE MANURE!!!" 

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