[ntp:hackers] How many servers for a pool config line?
tglassey
tglassey at glassey.com
Sat Nov 28 15:33:47 UTC 2009
Danny Mayer wrote:
> Hal Murray wrote:
>
>> Thanks.
>>
>> davehart at gmail.com said:
>>
>>> tos maxclock 4
>>>
>> mayer at ntp.org said:
>>
>>> For example: pool pool.ntp.org maxservers 5.
>>>
>> The tos maxclock code already exists. The maxservers approach seems more
>> natural. I don't plan to implement it.
>>
>>
>> Having thought about it a bit more...
>>
>> The current code gets up to maxclock addresses per pool config line. You
>> might think you could change maxclock between pool lines, but the whole
>> config file is parsed before it is processed. So that last maxclock wins for
>> all of the pool lines. (Or something like that.)
>>
>> What we probably want is something like:
>> tos totalpoolservers xxx
>> pool a.pool.example.com
>> pool a.pool.example.net
>> ...
>>
>> Where it would try to get a total of xxx pool servers using whichever names
>> respond first.
>>
>>
>> If you think diversity is good, something like:
>> tos totalpoolservers 6
>> pool a.pool.example.com maxservers 2
>> pool a.pool.example.net maxservers 2
>> pool b.pool.example.com maxservers 2
>> pool b.pool.example.net maxservers 2
>> ...
>> might help avoid putting too many eggs in one basket.
>>
>> All that seems like overkill. If it's that important, you are probably
>> willing to specify the servers by hand.
>>
>> But maybe there will be more than one pool someday.
>>
>>
>
> There already is. Anyone can set up a DNS server and provide a list of
> ntp servers in a pool via a single name (or different ones for different
> locations) in their corporate, campus or other domain. You'd then have
> all of the ntp daemons use it via the pool directive. There's no
> obstacle to doing this today.
>
Danny's right - we already use this for arranging the servers we operate
into pools so this is already done AFAIK.
Todd
> Danny
>
>
>
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