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----- Original Message -----
From: "Dr. Volker Jaenisch" <volker.jaenisch@xxxxxxxxx>
To: "LinuxVirtualServer.org users mailing list."
<lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, May 16, 2007 3:35:36 PM (GMT-0800) America/Los_Angeles
Subject: Re: Servers unable to flush data to clients
Hi Brian!
Brian Staszewski schrieb:
> Hey everyone. I implemented an LVS-NAT/ldirectord setup for a web site and
> I'm having some strange problems. What appears to be happening is that
> somehow the real servers are not always able to send data back to the client
> that made the request. When I view apache's status page (/server-status/)
> I'll see many connections in the "W" (Sending Reply) state, and they'll stay
> there until they either time out or I restart apache.
>
>
Here a few suggestions:
* Is the loadbalancer able to fetch pages from the reals? Check this
with lynx.
* Have you checked that the default route on all reals points to the
loadbalancer? If you use iproute with source routing double check your
routing table with "ip rule"
* Try turning the apache configuration option keepalive to OFF.
Beste Regards,
Volker Jaenisch
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Dr. Volker Jaenisch http://www.inqbus.de
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------------------
Okay, it took me a little bit to respond to this because I was setting this up
in a test environment and making sure I could duplicate the results, and I have.
To answer your questions:
* Is the loadbalancer able to fetch pages from the reals? Check this
with lynx.
Yes. No problems here. I've also got ldirectord fetching pages as it's server
check.
* Have you checked that the default route on all reals points to the
loadbalancer? If you use iproute with source routing double check your
routing table with "ip rule"
All reals point to the internal virtual IP of the LVS cluster for default
gateway. I double checked their routing tables and verified that this is the
case.
* Try turning the apache configuration option keepalive to OFF.
This made no difference. The connection problems happened just as often whether
keepalives were on or off.
I did note one thing in response to Joe's reply, and that was that if I stop
iptables completely the problem goes away.
Thanks,
Brian
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