[Linux-HA] Secondary Interfaces, and Host Names

[Andrew Beekhof]

On Tue, Jul 21, 2009 at 2:55 PM, Karl W. Lewis<karl.w.lewis at gmail.com> wrote:
> So, I'm setting up a web server on an HA-Linux Cluster using heartbeat v2.99
> and Pacemaker.
>
> I'm setting it up on a set of three Egenera blades.   These blades have no
> actual network interfaces, that is handled by the frame.  So, there are the
> interfaces over which the web server will talk to the world, and a virtual
> IP Address managed by the cluster, and I have set up a "private" network
> that he cluster can use to chat that is not connected to any other network.
> I've assigned IP addresses for that virtual interface on each blade, but now
> I have a question that I fear will reveal my ignorance...
>
> How do I relate the private network IP Addresses to each host?  Currently,
> the public addresses for each host are associated with the hosts in the
> /etc/hosts file.  And, those names are the ones that you get if you do a
> `uname -n` on any of the blades.  Should I use the private network addresses
> instead?

If you want to be able to have those IPs move to another node if the
normal owner dies, then yes.
Otherwise, it probably doesn't matter too much.

> My ha.cf file contains the line: bcast eth1 eth0. eth1 is for the
> private network, but it occurs to me that heartbeat can't know how to get to
> the other nodes over eth1 because I've not told it what those addresses
> are.

hint: bcast

> Should I re-write my hosts file such that the private addresses are
> the ones associated with the proper host names?
>
> Since these are egenera blades, I can't use serial/null modem cables to
> connect the cluster as the blades don't have any of those, either.
>
> My google skilz, such as they are, have failed me... I have been unable to
> find any details of a setup like this.  I'd be most appreciative if anyone
> could provide any tips, pointers, or practical examples.
>
> Thanks,
>
> Karl
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