Two days ago my e-mail server died. A powered USB hub apparently sent
12V where only 5V should go, frying my redundant disks. And the
Raspberry Pi 4.
I have replaced everything and it seems to be running again. I need a
better recovery plan.
I used to have a backup server running in a different location, I need
to do that again, but I am wonder how?
The previous version was crude: A completely independent and separate
server, each server with its own MX record, one with a higher priority.
This was annoying as a user, but it had the advantage of not having many
single-points-of-failure. (DNS, me…)
In a few days, if this server is still running nicely, I plan to order a
completely new set of hardware and set configure it. The question is how?
I see three general options:
1. As I did before, two servers, my wife and I have to check both,
though mostly everything happens on the high priority server. Advantage:
simple design.
2. As before, but with the extra safety of each server having a
secondary set of users, and have each server automatically rsync
Maildirs to the other's secondary users. (Or actually mail to the other
backup user.) Advantage: The backup, once it is working, isn't likely to
have one server kill the other, still pretty simple design.
3. Something where one server forwards e-mail to the other (but not same
e-mail back again) to keep the two kinda in sync or perfectly in sync.
Disadvantage: Tightly coupled, looks hard to set up, and prone to single
systemic failure.
Suggestions? War stories?
Thanks,
-kb
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