[ntp:questions] ntp architecture
brontolinux at gmail.com
Tue May 21 14:18:24 UTC 2013
On 21/05/2013 14:31, Riccardo Castellani wrote:
> n.4 srv Internet--> server A
> server A --> server B
> 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
1) two servers is maybe the worst situation; use one, or three, or four
if possible, but not two.
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.
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).
I 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.
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