I'm currently running a pretty basic high-availability configuration for
our mail server (postfix) - it simply runs in a Xen virtual machine,
with mirrored disks across two machines (DRBD), and failover of the VM
if something goes wrong (pacemaker).
I'm thinking about migrating the failover host to a 2nd datacenter -
which makes disk mirroring and VM migration a bit trickier, and I really
don't like how brittle all that infrastructure is, so I'm starting to
think about application layer redundancy - two mailservers, at remote
locations, multiple DNS records, and doing something to replicate ques,
configurations, and local delivery. The goal is the same: keep
processing mail if a machine goes down, and don't lose any data to
machine or disk crashes.
Which leads to a question: Are any of you running such a
configuration? If so, can you describe what you're doing? And.. are
there any good references, presentations, etc. that anybody knows about
re. building high-availability, scalable, distributed mail processing
Thank you very much,
In theory, there is no difference between theory and practice.
In practice, there is. .... Yogi Berra