We have a rack of compute nodes that are provisioned stateless. Each node
has two ethernet ports, connected to a pair of ToR switches, that are set
to try and boot PXE. We would like to set these up so that they are in a
bond (mode 1, actiive-backup) when they start up. They are currently set up
to use just eth0 and switch discovery and are currently working with a RHEL
6 install and xCAT 2.10.
The objective is to have nodes able to start up or reboot even if one of
the ethernet interfaces was lost, or one of the ToR switches was offline.
We're monitoring the health separately to detect that.
I've gone over various bits of documentation, the mailing lists, and user
submitted docs, etc. I'm uncertain if this is possible or what the best
approach is to pursue.
Is it possible to simply configure the nodes so that they would be
configured in a bond0 with slaves eth0 and eth1 right from the start? I
can't see that in the documentation, but there are comments in confignics
that mention master and slave.
Then there is the configbond postscript? So the node would boot up on one
interface, but then configure in postscript as a bond? But I think I saw in
the docs that this may not be good since it would interrupt the network and
an "at" command should be used? Not sure which way that's going.
Then in the mailing lists someone asked what sounded similar to my
question, and was told you can write your own postscript.
Out of these possibilities, which is the recommended approach? Pointers to
documentation I might have missed or hints would be greatly appreciated.
Thanks very much.
--David
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