Re: Clustering

[William Lanning <william wonderwaylabs com>]

>>> On Wed, 31 Jul 2002, Steve Buehler (steve vespro com) spoke:
> Is anybody running Clustering with multiple sites on one server?
Yup, I've put a maximum of 25 sites on 1 cluster system, but it's not
really one server, if you know what I mean. ;)

Oh, using LVS, (direct routing) BTW.

> If so, what are the problems with this?
The only snag was loading multiple 'dummy' interfaces on the real servers
via standard ifcfg-dummyN files.  The system will load modules for dummy0
just fine using an "ifcfg-dummy0" config file, but I had to load
subsequent 'dummys' like this:

/sbin/insmod -o dummy1 dummy
/sbin/ifconfig dummy1 N.N.N.N broadcast N.N.N.N netmask N.N.N.N up
/sbin/insmod -o dummy2 dummy
/sbin/ifconfig dummy2 N.N.N.N broadcast N.N.N.N netmask N.N.N.N up

Wash, rinse, repeat as desired.

Each domain was dedicated an IP, but I imagine VHOST'ing would work just
fine, I just never have the opportunity to test it.  Of course you need to
suppress MAC announcements when using direct routing (process differs
depending on 2.2.x or 2.4.x), or you could opt for NAT which is a Good
Thing IMO.

> We...were told that you run into problems if you are actually running
> more than one site in the cluster even though it CAN be done.
Milage varies for sure but my system lived for almost 2 years without
trouble, and changed for reasons unreleted to the cluster configuration.

Good luck.

Cheers,
William

-- 
William Lanning ** RHCE
=*=*=*=
111,111,111 x 111,111,111 = 12,345,678,987,654,321