On 25/07/2019 20:39, John Pierce wrote:
On Thu, Jul 25, 2019 at 10:32 AM hw hw@gc-24.de 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.