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From: Jim Balo (jimbalo22yahoo.com)
Date: Fri Oct 26 2007 - 12:57:22 CDT
We are hosting our own postfix server and all is working well at this point. But we do not have redundancy, which I would like to address on a very basic level (trying to keep it simple and low-cost). Here is what I plan:
1) Have a backup linux server and use rsync to synchronize all pertinent data from the live mail server to the backup linux server nightly. The backup linux server is cloned from the live server and can be made the live mail server (in the event of the live server breaking) by simply changing the IP to that of the main server and starting relevant daemons, etc.
2) Have two public IPs for the mail server. We have two internet connections at the location of the mail server. Currenly I have one public IP mapped to the live mail server in the DMZ, but if that internet line goes down, we lose the mail server access. I plan to setup a second public IP (on the second internet line) and mapping it to the same (live) mail server, so that the live mail server can be accessed even if the primary internet connection goes down.
Point # 1 above is already working (I think - I have not had to try it yet).
I am not sure how to setup # 2 - I am not too familiar with Postfix (or DNS). Can this be done? Does it make sense or is there a better way to do this?
Recommendations would be appreciated!
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