[ntp:questions] ntp architecture
ric.castellani at alice.it
Fri May 24 05:42:34 UTC 2013
What do you think for my architecture about this configuration in my ntp.conf
for all 3 servers:
NTP technicians people says:
Never put those lines in
any ntp config outside of some test environment in a lab.
manufacturers put those lines in example configs)
on 21/05/2013 14:31,
Riccardo Castellani wrote:
> n.4 srv Internet--> server A
> server A -->
> A --> server C
> A is my internal source
> B,C are
cluster machine so hardware
> is reliable but I don't want to present these
servers directly on pubblic network
>>1) two servers is maybe
the worst situation; use one, or three, or four if f possible, but not two.
I'll create 3rd
server as D, server A -> D
>> 2) both servers pointing to A: A is a single
point of failure. If A dies, B and C will both be left to their own devices.
I had a similar problem -- I needed to feed clients in a private network that
were not NAT'ed to the public network, and did as follows.
True ! You are
right but I'm not interesting if for a day, server A failures and clients will
be left to their devices.
>> I have four servers on the public network, Pu1..
Pu4; each of those server uses four different public sources,
>> and no public
source is shared between two different servers (so they are 16 in total).
have four servers on the private network, Pr1..Pr4. Each one of them uses Pu1..
Pu4 as sources,
>> but PrX marks PuX as preferred. This way, in >> normal
conditions they all follow a separate source (in a sense, PrX is a "repeater"
of PuX in the private network).
>> If a public servers fails, say Pu1, then Pr1
will follow the one among Pu2..Pu4 it thinks it's the best.
>> The service on
both public and private will be a bit degraded, but the resulting configuration
will still be good enough to give us time to fix problems safely.
Did you use for your 4 servers on the public network and for your 4
server on the private network the following lines:
restrict 127.127.1.0 mask 255.255.255.255
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