[lug] Clusters?

[George Sexton]

I have done this on a 64 node Intel cluster, and a 24 node Alpha cluster.
Most of the stuff that I have seen (PVM /MPI) uses the RSH command to
execute the program on the slave machines. The basics to get this working
are:

host names have to be resolvable from the master to each slave.
Host names must be resolvable from each slave to the master.

You have to set up hosts.equiv on the slave machines.

The account you want to run the software under must exist on each machine. I
recommend using NIS/YP on the master, and slaves. This simplifies life quite
a bit. I don't know about SuSe, but the default RedHat configuration
prohibits root from using rsh/rlogin. This means that if you try to use the
root account to run PVM/MPI programs, it will fail.

Once you do this, the MPI/PVM should work without a hitch. Of course this
isn't super secure, so you might want to consider hacking the systems to use
ssh for executing the commands remotely. I have never done this, but it
should be a matter of hacking the shell script that starts the commands on
the remote machines.

George Sexton
MH Software, Inc.
Voice: 303 438 9585
http://www.mhsoftware.com


-----Original Message-----
From: lug-admin at lug.boulder.co.us [mailto:lug-admin at lug.boulder.co.us]On
Behalf Of Aaron Root
Sent: Wednesday, May 31, 2000 7:49 PM
To: lug at lug.boulder.co.us
Subject: [lug] Clusters?


Does anyone have experience setting up linux clusters?  I have several
133 and 166 machines I'd like to cluster just for the fun of it.  I have
SuSE 6.3 and have installed the beo packages but haven't had much luck
getting anything to work.  If anyone could give me some advice on
getting started I'd appreciate it.

Thanks,

Aaron Root
Thornton, CO

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