[CentOS] how to increase DNS reliability?

On 7/25/19 9:39 PM, John Pierce wrote:
> On Thu, Jul 25, 2019 at 10:32 AM hw <hw at 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.

right, with hot swappable batteries ...

> my last rack builds, I had 2 Eaton PowerWare 7KVA 4U UPS's in the bottom of
> each rack.  one fed the left side PDUs, the other fed the right side PDUs,
> and each server had redundant PSU's, one plugged into each PDU.
> 
> those Eaton UPS's had hotswappable batteries, too.

... like this