[LinuxFailSafe] 2 node cluster

[Christian Hammers]

On Thu, May 15, 2003 at 07:11:13PM +0100, Dan Goscomb wrote:
> i do not want to use any load directors... believe me i've looked at
> everything and i would prefer an app switch, but cost is a major issue
> here. i have 2 machines to work with, and that is it.

Did you take a look at http://www.backhand.org/wackamole/ ?

"Wackamole is quite unique in that it operates in a completely
peer-to-peer mode within the cluster. Other products that provide the
same high-availability guarantees use a "VIP" method. A networking
appliance assumes a single virtual IP address and "maps" requests to
that IP address to the machines in the cluster. This networking
appliance is a single point of failure by itself, so most industry
accepted solutions incorporate classic master-slave failover or bonding
between two identical appliances."

Apart from that I've once implemented a 2-host failover scenario where
both hosts where active at the same time. I used drbd+nfs to share data
between them and self written scripts+fake to get the other one's IP.
The major problem here is the case where both machines are failing due
to a broken internet link or a broken external LDAP server etc.
If you use fake, both machines have to be in the same subnet.
I'm don't know yet how to use two redundant load directors :-(

hope that helps

bye,

-christian-

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