On 25/07/2019 20:39, John Pierce wrote:
On Thu, Jul 25, 2019 at 10:32 AM hw <hw@xxxxxxxx> wrote:
I can't help it when the primary name server goes down because the UPS
fails
the self test and tells the server it has 2 minutes or so left in wich case
the server figures it needs to shut down. I wanted better UPSs ...
critical infrastructure servers should have redudant PSUs, on seperate UPSs.
Separate DNS servers must be on a different subnet according to RFC2182
(https://tools.ietf.org/html/rfc2182):
Secondary servers must be placed at both topologically and
geographically dispersed locations on the Internet, to minimise the
likelihood of a single failure disabling all of them.
I know that UPSs are physical, and subnets are logical, but the
reasoning behind the requirement is due to having to be on a different
infrastructure.
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