|
Hi all,
I have setup a test environment for determining if VLS would be a good
solution for balancing our multiple webservers. Currently we are using an
old-fashioned DNS Round Robin setup, so anything should be an upgrade
here! However, I am having a few key problems that I cannot determine the
fix to, which is where I hope you can help :)
The setup:
CentOS 5 server setup [weblb.domain.com] as primary VLS router (no backup
in the lab yet) with one external IP address (no internal) using Direct
routing with IPTables marking port 80/443 traffic with "80"
2 CentOS 5 webservers setup [web01 and web02] with one external IP each
and IPTables setup for PREROUTING information.
The problem:
When I create my intial connection to the VIP, it passes me correctly to
one of the machines. However, if I shutdown apache on that box, or
poweroff the machine entirely, I am never redirected to the online box,
nor do any alarms go off.
I am using the default monitoring script included, and I can see it
opening port 80 on both web01 and web02 (by looking at apache access
logs), but it doesn't seem to want to fail over. Furthermore, if I
manually go in and deactivate a Real Server, it still continues to try to
send traffic to it.
I have looked around on Redhat's site and the web for general debugging
and troubleshooting guides, but I am at a bit of a loss. Does anyone have
any suggestions on where to start looking?
Is this potentially an ipvsadm or nanny issue?
Thanks so much!
PS - I have intentionally been a bit vague regarding some of the setup so
as to not hit the list with a 3 page email. If you ask I will gladly
produce more information to help in the process.
Nick
|
