David,
VRRP itself is a router redundancy protocol (the name itself meaning Virtual Router Redundancy Protocol), and it's definition can be found at http://www.ietf.org/internet-drafts/draft-ietf-vrrp-spec-v2-06.txt.
There are several different implementations of this protocol for UNIX based systems. I can't speak for the Linux implementations, but the most commonly used one for FreeBSD systems is 'vrrpd'. A quick Google search for vrrpd should net you the homepage for the project.
vrrpd is very quick and easy to set up. I think you'll find it suitable for your applications. It can provide failover for 2 to 64 computers (not quite sure about that upper limit, but I know that it can provide failover for only two machines).
Good Luck!
Brantley Hobbs
Applications Developer
University Of Georgia - Information and Technology Outreach Services
Athens, GA, USA
> -----Original Message-----
> From: David Gil Sanchez [mailto:indaba@gmx.net]
> Sent: Wednesday, May 01, 2002 5:47 AM
> To: pen@siag.nu; ulric@siag.nu
> Subject: single point of failure: what is vrrp
>
>
> Hi,
> I am evaluating pen to use it in a project where
> we have 2 apache servers on red hat 7.1 and
> i want to have a system that do:
> -load balance, fault tolerance,
> session persistence (http session).
>
> i have some cuestions about pen:
>
> - support it session persistence (i
> suppose yes...)
> - IMPORTANT: fault tolerance: in the doc you say:
> "The final single point of failure, pen itself, can be eliminated by
> running pen on several servers, using vrrp to decide which is
> active. "
>
> what is vrrp?, can i achieve this with
> only 2 servers.
>
> thanks in advance.
> david
>
> --
> David Gil Sánchez
> ------------------------------------------------
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