[rhelv6-list] IP load balancing

[Matthias Saou]

Patrick H. wrote :

> So I just started setting up a RHEL6 box for use in a load balanced 
> cluster and have run across a problem. The way you set up a virtual IP 
> on the back end realhost side is to add an interface alias to the 
> loopback device (such as lo:0). Well the ifup-eth script in RHEL6 
> refuses to add aliases to the loopback interface. Additionally if you 
> try to add the alias to the real ethX device instead it fails because 
> the arping check it does finds that the IP is already running on the 
> IPVS director.
> 
> So, how is one supposed to setup a realhost now?
> The difference from RHEL5 is that RHEL5 doesnt check to see if youre 
> adding an alias to the loopback device or not. Why does RHEL6 even care 
> about that anyway? Theres nothing wrong with it...

I've quickly tested a simple ifcfg-lo:0 like this and it works fine for
me on RHEL6 :

DEVICE=lo:0
IPADDR=10.0.0.1
NETMASK=255.255.255.255

Maybe you've been using a netmask which overlaps with some of the
addresses configured on your eth interfaces : Don't do that for those
"dummy" addresses.

Matthias

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