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Hi,
I have an UM3 setup using High Capacity High Availability and Load Balancing
with BGP failover between two routers complicating the setup. In total I've
got 4 different networks, 2x /28 networks not on BGP for the physical
servers, and a /25 network and a /26 network covered under the BGP failover.
When the primary router is active LVS is in place using a pair of directors
using heartbeat between each other (and when it's not the servers under the
secondary router activate Ethernet device IP aliasing (eg. eth0:0, eth0:1,
etc) and drop their LVS setup).
So up until now we've had the LVS directors sit on the /25 network, but they
need to be moved to the /28 network under the same router to communicate
with the servers under the other router. The LVS directors have been
covering both of the two now BGP'd networks (the /25 and /26) configured
under Direct Routing fine until this point.
Last night I attempted to move the LVS director from the /25 network to the
/28 under that router and while the director could see the servers as being
up and running, no actual traffic was getting through to them. Initially
the directors could not see any services up and running so I reverted the
configuration back to the known working one. Then after looking though the
config on the directors again I attempted it once more and restarted
services on the real servers which is when the directors could see the
services being up, but no traffic was being returned. So after about half
an hour (waiting for some arp traffic) I switched the
IP/gateway/broadcast/netmask/network config back again and am using the
original configuration.
Looking through the configuration notes for UltraMonkey, the only noticeable
thing which I missed for sure last night at 2am is that I hadn't change the
DNS IP configuration for the servers neither under our DNS or the /etc/hosts
file.
I'm looking through Joseph's HOWTO and Mini-HOWTO for hints at the moment
but if anyone has a hammer to whack me on the head with that'd be great.
___________________________________________________
Dan Brown
danb@xxxxxx
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