25.03.2011 18:47, darren.mans...@opengi.co.uk:
We configure a virtual IP on the non-arping lo interface of both
servers and then configure the IPaddr2 resource with lvs_support=true.
This RA will remove the duplicate IP from the lo interface when it
becomes active. Grouping the VIP with ldirectord/LVS we can have the
load-balancer and VIP on one node, balancing traffic to the other node
with failover where both resources failover together.
To do this we need to configure the VIP on lo as a 32 bit netmask but
the VIP on the eth0 interface needs to have a 24 bit netmask. This has
worked fine up until now and we base all of our clusters on this
method. Now what happens is that the find_interface() routine in
IPaddr2 doesn't remove the IP from lo when starting the VIP resource
as it can't find it due to the netmask not matching.
Do you really need the address to be deleted from lo? Having two
identical addresses on the Linux machine should not harm, if routing was
not affected. In your case, with /32 netmask on lo, I do not foresee any
problems.
We use it in this way, i.e. with the address set on lo permanently.
--
Pavel Levshin
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