On 08/12/2004, at 10:21am, Tom Shilson wrote:
Would you care to mention the names of a few of those packages?
Keepalived is one. http://www.keepalived.org. I wrote this up in a Redpaper a little while back (REDP-3657, "Virtual Router Redundancy Protocol on VM Guest LANs").
Although my paper talked about using Keepalived for router redundancy (simply using the VRRP component), it is also useable for the intended purpose. VRRP provides an "application IP address" which will transfer from one machine to the other as required. What you do with that IP address is up to you: I simply used it for redundant IP gateway function (the traditional purpose of VRRP) but you could easily host applications behind them.
Alan S, you might get value out of the status checking features of Keepalived that let you point the daemon at a static web page (for example) and make failover decisions on the actual status of the application.
As Mark mentioned, there are quite a few of these packages. Keepalived (which is a sub-project of Linux Virtual Server, btw) is one that from experience works on Guest LANs (so should work fine on VSWITCHes too).
Cheers, Vic Cross
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