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I have an LVS-DR cluster which has been running for seven months without
a hitch. Recently, the cluster started to timeout on the majority of
connections. Some connections were passed through to a real server and
processed. I have tried for a week to figure out what happened. What I
found was that one real server out of five is connecting and servicing
the client request. The other four real servers have the HTTP connection
stuck in the SYN_RECV state until it times out (60 seconds).
In summary, I have seven CentOS 6.4 servers (kernel
2.6.32-358.18.1.el6.x86_64). Two servers are configured as load
balancers (a primary and a backup) and five real servers. I have setup
LVS-DR using IPTables. The servers have a public IP bound to a NIC
device and an internal VLAN bound to a second NIC. The VIP is configured
on the real servers local loopback (lo:0) device. The
/etc/sysconfig/ha/lvs.cf was setup properly and everything was running
successfully for seven months.
We installed new versions of our software for the web service we are
running. Nothing network related. All five real servers were updated the
same way. I am comparing the one working real server from the four that
are not working. So far I have found nothing.
Any ideas on trouble shooting points?
--
Best Regards,
Bruce
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