On 25/07/2019 13:51, hw wrote:
Hi,
how can DNS reliability, as experienced by clients on the LAN who are
sending queries, be increased?
Would I have to set up some sort of cluster consisting of several
servers all providing DNS services which is reachable under a single
IP address known to the clients?
Just setting up several name servers and making them known to the clients
for the clients to automatically switch isn't a good solution because
the clients take their timeouts and users lacking even the most basic
knowledge inevitably panic when the first name server does not answer
queries.
Sounds like you're performing maintenance on your servers
(a) too often
(b) during office / peak hours
You could load balance multiple servers (using lots of available
load-balancing technologies) to allow you to perform maintenance at
certain times, but it has its own issues.
I've recently been looking at PowerDNS, which separates the recursor and
the authoritative server into two distinct packages. I'm just running
the authoritative server as a master, and keeping my old bind/named
servers as recursors / slaves. It's a home office network, but I only
have issues when I'm tinkering, and if I were to be doing this kind of
work in a larger commercial environment, then I would not be doing DNS
server maintenance while others were relying on them.
For much of the back end infrastructure I use IP addresses rather than
DNS names in their configuration, just to take DNS issues out of the
equation completely.
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