[lvs-users] FW: Self Configuring High Availability LVS with Keepalived

[Joseph Mack NA3T]

On Tue, 23 Oct 2007, David Hinkle wrote:

> I'm trying to put together a self configuring high 
> availability LVS.  Each of my units is a proxy server.  
> Each of them is identical, except a little configuration, 
> and I intend them to come up, elect a director, and serve 
> content.

this was a highly hoped for goal in the early days of LVS. 
The director isn't all that different to a realserver. When 
a director fails out, one of the realservers should be able 
to take over, presumably automatically. The service 
listening on the VIP would have to be shut down on going 
from realserver to director.

However one we got the two director failover working, people 
lost interest. One working scheme was enough, at least for 
the moment.

> I notice when I have a unit in BACKUP state, when I do 
> "ipvsadm" I see all the lvs stuff is configured in the 
> kernel.
>
> Does this mean that the unit will try to do load balancing 
> when a connection comes in instead of just ignoring it and 
> allowing the proxy server's user space software to process 
> it?

usually a director in backup state doesn't have the VIP, so 
there are no packets for it to ignore. If you sent it packet 
for the VIP backup director would loadbalance them.

> If so, Can I configure keepalived in such a way that the 
> ipvsadm stuff isn't set up until a unit goes to MASTER? 

it doesn't take any time to setup ipvsadm, so yes.

> And if so, will the connection state information 
> successfully synchronize?

once the demon starts and lets the partner demon in the 
other director know where it is

Joe

-- 
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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