Re: virtual_server_group does that do what I think is does?

On Jul 23, 2014, at 8:19 AM, Mike Williams wrote:

> Sorry if this is the wrong place for idiot user questions, there isn't a 
> keepalived-users list and other people seem to be asking user-type questions 
> here.
> 
> So I'm looking to swap from ldirectord to keepalived.
> 
> One particular point confusing me no end is virtual_server_group.
> It seems like a slam dunk feature, but my puny brain can't grasp how to 
> actually use it.

I use this feature extensively and can hopefully help you understand with an example:

virtual_server_group VIP01 {
        x.x.x.x 80
        x.x.x.y 80
}

virtual_server group VIP01 {
        delay_loop 10
        lb_algo wrr
        lb_kind NAT
        protocol TCP

        real_server 10.x.x.x 80 {
                weight 10
                TCP_CHECK {
                        connect_timeout 3
                }
        }
        real_server 10.x.x.y 80 {
                weight 10
                TCP_CHECK {
                        connect_timeout 3
                }
        }
}

In this example, there are 2 VIP's (x.x.x.x:80 & x.x.x.y:80) with common real servers (10.x.x.x:80 & 10.x.x.y:80). Now you could keep adding new IP & port combinations into the vritual_server_group VIP01 stanza and they would all get the same real servers.  I'm not 100% sure if this reduces the number of checks from N to 1 ... but I would think/hope it does. Hope this helps.

-T



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