Moreno's setpe alternative to solve the 2 NIC node setup. Please test.

This is about a possible replacement or alternate for setpe.  We need some user testing and feedback on Moreno's document below.  Thanks, Bruce
>>From: 	Moreno Baricevic <[email protected]>
To:	Bruce Knox <[email protected]>
Date: 	11/29/05 4:11AM
Subject: 	Re: [openMosix-general] Starting with openMosix

Hi guys,

I wanted to be as much detailed as possible but, perhaps, it's going to
be too verbose. Do you suggest any cut or modification?

Ciao

Moreno

==============================================

I have two NICs and I get this message: setpe: the supplied table is
well-formatted, but my IP address (xxx.xxx.xxx.xxx) is not there!:
---------

Setpe scans the openmosix.map file and tries to find a match with the
"hostname" IP. The compared IP depends on the current hostname (short
host name, as returned by gethostname()) and on the first resolved match
in /etc/hosts or on the dns server (gethostbyname() depends on "order"
line of /etc/host.conf). In the case of 2 or more network interfaces,
the one which owns the IP associated to the short hostname wins,
therefore setpe is not able to find a match for a second interface.

Assuming you have one NIC on the cluster network (192.168.10.250) and
one NIC on a public network (111.111.111.111), to make setpe stop
complaining you have some alternatives. You can tweak your hostname and
/etc/hosts entries, but this solution could lead to other problems if
misconfigured:

1) Assuming hostname == bar:
	/etc/hosts:111.111.111.111	foo.public	foo
	/etc/hosts:192.168.10.250	bar.cluster	bar
   effects:
	hostname -s == bar
	hostname -f == bar.cluster
	IP (setpe)  == 192.168.10.250
2) Assuming hostname == foo:
	/etc/hosts:192.168.10.250	foo.cluster	foo
	/etc/hosts:111.111.111.111	foo.public	# short name != foo
   effects:
	hostname -s = foo
	hostname -f = foo.cluster
	IP (setpe)  == 192.168.10.250
3) Assuming hostname == foo:
	/etc/hosts:192.168.10.250	bar.cluster	bar	foo
	/etc/hosts:111.111.111.111	foo.public	# short name != foo
   effects:
	hostname -s == foo
	hostname -f == bar.cluster
	IP (setpe)  == 192.168.10.250

If you prefer a different and, IMHO, safer solution, you can use the
modified version of setpe available here:
	http://www.democritos.it/~baro/sw/setpe/
This version of setpe scans the openmosix.map file and looks for a match
with the IP of each available network interface (if_nameindex() makes it
independent from the hostname and hosts order). In case of failure
(network not configured), it just falls back to old behaviour and tries
to find a match with hostname (with all that it implies, as described
above).




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