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NS> Joseph Mack NA3T (jmack@xxxxxxxx) JMN wrote today:
JMN> On Mon, 2 Jul 2007, Nick Stephens wrote:
JMN>
JMN> > Hi all,
JMN> >
JMN> > I have setup a test environment for determining if VLS would be a good
JMN>
JMN> LVS
My apologies, my brain was in the wrong spot ;)
JMN>
JMN> > CentOS 5 server setup [weblb.domain.com] as primary VLS router (no backup
JMN> > in the lab yet) with one external IP address (no internal) using Direct
JMN> > routing with IPTables marking port 80/443 traffic with "80"
JMN>
JMN> hmm don't know what this last line means. Are you scheduling
JMN> LVS with fwmarks?
Yes, using fwmarks. from the LVS router:
-A PREROUTING -d x.x.x.x -p tcp -m tcp --dport 80 -j MARK --set-mark 0x50
-A PREROUTING -d x.x.x.x -p tcp -m tcp --dport 443 -j MARK --set-mark 0x50
and from the Real Servers:
-A PREROUTING -d x.x.x.x -p tcp -m tcp --dport 80 -j REDIRECT
JMN>
JMN> > 2 CentOS 5 webservers setup [web01 and web02] with one external IP each
JMN> > and IPTables setup for PREROUTING information.
JMN>
JMN> it's best to try setting up an LVS without iptables, then
JMN> add the rules after it's working.
Yah, when reading through the RHEL setup guide I went with IPTables and
direct routing because it was what I wanted as an end result. I'd been
tossing around the idea of using a NAT solution just to test, but it felt
like somewhat of a circular motion since that isn't what I want in the
end.
JMN>
JMN> > When I create my intial connection to the VIP, it passes me correctly to
JMN> > one of the machines. However, if I shutdown apache on that box, or
JMN> > poweroff the machine entirely, I am never redirected to the online box,
JMN> > nor do any alarms go off.
JMN> >
JMN> > I am using the default monitoring script included,
JMN>
JMN> there's a million distros out there and you must excuse me
JMN> if I have no idea what the default script for yours is.
I apologize, CentOS = RHEL, and the default monitoring script is simply
and http get:
send = "GET / HTTP/1.0\r\n\r\n"
expect = "1.3.37"
use_regex = 0
JMN>
JMN> > and I can see it opening port 80 on both web01 and web02
JMN> > (by looking at apache access logs), but it doesn't seem to
JMN> > want to fail over. Furthermore, if I manually go in and
JMN> > deactivate a Real Server, it still continues to try to
JMN> > send traffic to it.
JMN> >
JMN> > I have looked around on Redhat's site and the web for
JMN> > general debugging and troubleshooting guides, but I am at
JMN> > a bit of a loss. Does anyone have any suggestions on
JMN> > where to start looking?
JMN>
JMN> How about in the LVS HOWTOs
I actually just found this website thbis morning, so I am heading there
now :) I was just curious if it was a common issue that people experience
with the router not being properly notified that a machine is down.
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