RE: Apache clustering w/ load balancing and failover

[Thomas Lamy <Thomas.Lamy@netwake.de>]

Shri Shrikumar wrote:
> On Wed, 2003-09-17 at 18:46, Markus Oswald wrote:
> > On Wed, 2003-09-17 at 15:00, Shri Shrikumar wrote:
> > 
> > > Looking at the documentation for LVS, it mentions that it 
> needs two
> > > nodes, a primary node and a backup node which then feeds 
> into n real
> > > servers. 
> > 
> > Actually I never saw this mentioned in the documentation - I haven't
> > looked at it for quite some time now, tough.
> > 
> > LVS definitely works with ONE machine which acts as the 
> loadbalancer.
> > You can use a second machine for failover if you need the 
> redundancy,
> > but as far as I know, LVS can't handle this by itself so 
> you would have
> > to use keepalived or heartbeat for that.
> Hi,
> 
> Thanks for the response. Let me just clarify. If I have two 
> boxes, I can
> configure both of them to be webservers and one of them to be the lvs
> node. I dont need a third machine to be a dedicated node. Is this
> correct ?
> 
Ascii art:

            internet
                +-----------------------+
        +---------------+       + - - - - - - - +
        |  LVS Director |       |   Director 2  |
        +---------------+       +- - - - - - - -+
                |                       |
                 -------| SWITCH | -----+
                          |  |  |
          +---------------+  |  +---------------+
          |                  |                  |
  +---------------+  +---------------+  + - - - - - - - +
  |   Webserver   |  |   Webserver   |  |   Webserver   |
  +---------------+  +---------------+  +- - - - - - - -+

You need at least 1 LVS Director (balancer) and two servers to start.
The second LVS director and additional server are optional.

Thomas