Disaster recovery recommendations for RH Linux 8.0...

[Tobias Speckbacher]

DNS round robin will still give you a roughly 50% chance of hitting the
system that is down.  Although if your ttl for the zone is short enough
you could modify it and direct all traffic to the second server.  This,
however, at best is pseudo redundancy.

The smtp protocol offers you to set backup mx records via dns.
This will cause the sending server to try all of these before giving up
on delivery. (should the server in question be your MX host). Quick
search yielded http://www.dyndns.org/support/kb/mxrecords.html on this
topic.

I would definitely set up the system with 2 drives in a raid 1
configuration.  If you can afford it go for hardware raid, otherwise use
the md feature in RH.

http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html

-Tobias

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Ed Wilts
Sent: Tuesday, April 27, 2004 6:29 AM
To: General Red Hat Linux discussion list
Subject: Re: Disaster recovery recommendations for RH Linux 8.0...

On Tue, Apr 27, 2004 at 10:07:31AM -0400, Ken Morley wrote:
> I have a RH Linux 8.0 server used to filter email for spam and virues.
It
> receives email, filters it through SpamAssassin and ClamAV and then
relays
> the email to our Exchange server.  The email is only on the server for
a few
> seconds.

This is what we do here.  The way we've solved it is to run 2 RHL
servers and have DNS records that round-robin between them.  If either
system fails, the other will take 100% of the load, but on average, each
system takes half the load.

> Can anyone recommend a simple, inexpensive solution that would allow
me to
> image the hard drive periodically and quickly restore to a replacement
hard
> drive?  I'm thinking that the backup media would probably be CD-ROM
(the
> entire installation is only about 800MB uncompressed).

http://www.mondorescue.org

-- 
Ed Wilts, Mounds View, MN, USA
mailto:ewilts at ewilts.org
Member #1, Red Hat Community Ambassador Program


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