Re: DNS RR & Dual Directors ???

On Wed, 2 Apr 2003, pb wrote:

> Hello all,
>
> Anyone know if this is possible with LVS directors:
>
> DNS |------------- Director1/2 =====>| Real
>  RR |------------- Director3/4 =====>| Servers
>
> Note:  Director1/2 have heartbeat.
>        Director3/4 have heartbeat.
>        The SAME Real Servers are routed to by
>        both sets of directors.
>        Yes I know this is overly-redundant.
>
> Using NAT routing, the problem I see is setting the
> Real Servers default gateway to the NAT Router IP
> Address(es) of the Directors.  That is, each set of
> Directors have their own NAT Router IP address, so
> these seems to be a show stopper, no??? In other words
> all the Real Servers can only have ONE DEFAULT
> GATEWAY.
> If there is a working way around this, let me know?

The gateway is in fact a problem.. I don't know of any way
to rectify that. Also, by proposing this solution you are
creating potential problems. You say that it is 'overly
redundant'. Think about that statement for a minute, and
then think about the complete Director3/4 going down... Whenever
you add DNS to the mix (especially RR), all 'reliable' redundancy is shot.

>
> Also, with the latest kernels, does Tunneling and
> Direct Routing work yet, without having to apply some
> patch???   Specificially Red Hat kernels?

I'm currently running 2.4.20, patched on RH8..  Advanced Server MAY
include the kernel patches (I think they advertise LVS as a product
for that line), too many bells and whistles (X being one of them:))
for my purposes ;)

Hope that helps-

P

>
> Thanks
> Peter
>
>
>
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