Quoting Massimo Nuvoli <mass...@archivio.it>:
donovan jeffrey j ha scritto:
On Feb 16, 2010, at 8:09 AM, aa wrote:
Someone advised me to insert in the DNS zone a list of MX records
defined with the same level of priority so the DNS server will choose
one of them without invoking always the same mail server....
It could be an idea, in my opinion, but I'd prefer a "less random"
solution and a more scientific one....
very easy for smtp relays.
smtp1
smtp2
create a dns name smtp, and your system will round robin query for the
next available server.
DNS round robin is bad, it works but is defective for real load
balancing. The client choose the IP to use, this is "random", and
after can use the same ip for a while... this is not random.
The real solution is lvs or keepalived, the choice of the node is done
by the load balancer...
A broken client that can't be bothered to check MX records isn't
anybody's problem except the sender.
In fact, just like spambots, broken clients that send to the wrong MX
tend to end up on RBLs fairly quickly, making them even less of a
problem.
Terry
