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Ok feel free to join the computers in mocking me;
TCP
Checksum
Offloading
I thought I had it covered; had turned this off most places but,
evidently, not widely enough.
Steve Wray wrote:
> Hi there,
>
> I have a 2-node cluster with a couple of load balancers in
> active/passive configuration using heartbeat for failover.
>
> This is all under Xen virtualisation on two physical hosts; one load
> balancer virtual machine on each physical host. The load balancers are
> connected via heartbeat in an active/passive configuration.
>
> The load balancer sends http requests to one of two webserver virtual
> machines which are behind it, each on one of the physical hosts.
>
> I am running into a problem where:
>
> I have a virtual machine running on the same physical host as the active
> load balancer and on the same network as the front-side of the load
> balancers and their floating IP address.
>
> From this VM any http connections are only served by one of the
> load-balanced webservers.
>
> 50% of the time the HTTP connection times out. I believe that the load
> balancer is trying to balance these connections between the webservers
> but that one of these webservers either does not see it or cannot
> properly respond.
>
> In the webserver logs I can see that the webserver running on the same
> hardware node as the active load balancer is the one which serves the
> requests; the other webserver does not have these in its logs.
>
> HTTP connections from the identical VM running on the other hardware
> node, ie not where the currently active load balancer is running, are fine.
>
> The setup works fine in other respects and has been in service for some
> months now.
>
> I have no idea whats going on, the computers are mocking me :(
>
> My ldirectord.conf:
>
> checktimeout=10
> checkinterval=2
> autoreload=no
> logfile="local0"
> quiescent=yes
>
> virtual=xxx.yy.zz.ww:80
> fallback=127.0.0.1:80 masq
> real=192.168.0.4:80 masq 10
> real=192.168.0.3:80 masq 10
> service=http
> request="ldirector.html"
> receive="Test Page"
> scheduler=rr
> protocol=tcp
> checktype=negotiate
>
> (obfuscated external IP address, it isn't really xxx.yy.zz.ww)
>
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