|
On Wed, 10 Jan 2001, Lorn Kay wrote:
> The load balancer (or Director) should be able to get to port 80
> on a Real Server as well, shouldn't they Joe?
no, this is a bit of a trap, see the HOWTO section
12.2 BIG CAVEAT
*Trap for the unwary*
Mon runs on the director, but...
> Isn't this how health checks
> (at least in Piranha) are performed?
I don't know how Piranha works, but when mon watches the real-servers from
the director, it can't monitor port 80 on the VIP on the real-server. It
has to instead watch a service that tracks VIP:80. You setup the httpd on
the realserver to also listen to RIP:80. You hope that when the service on
VIP:80 dies that the service on RIP:80 dies at the same time. You don't
have to handle this explicitly for some services like telnet running
under inetd, as telnet is listening to all IPs.
Joe
--
Joseph Mack mack@xxxxxxxxxxx
|
