[CentOS-virt] IP based VirtualHost: IP aliases vs. additional virtual interfaces

Tue Aug 10 20:21:38 UTC 2010
Benjamin Franz <jfranz at freerun.com>

On 08/10/2010 02:01 AM, Mathieu Baudier wrote:
> n order to have the IPs available on some guests, I'm wondering
> whether I should:
> 1 - add additional virtual interfaces
> or
> 2 - set up IP aliases (eth0:1, etc.) in the guests
> I imagine that (1) would be faster and more efficient (but that's a
> guts feeling), and it feels cleaner.
> But with (2), I just need to restart the network in order to add new
> IPs (there won't be that many: like around 10 in the next few months),
> insteead of restarting the whole guest.
You don't have to restart the guest to add or remove aliases:

ifup eth0:1

ifdown eth0:1

work fine for starting and stopping them.

Benjamin Franz