installation help needed ...newbie

rick bradshaw rabrads at erie.net
Sat Mar 9 19:48:07 EST 2002


I have a small setup with redhat7.2. I used lam and MPI and ssh.
here is a good link for using ssh without passwords

http://www.cs.umd.edu/~arun/misc/ssh.html


and as for the other stuff like lam I setup the environment variable

LAMRSH='ssh -x'
on all the machines. It seems to be working

Rick Bradshaw
rabrads at erie.net

Stephanie Bluebear wrote:

>This is the deal. We have a cluster with 16 nodes (32
>proc) running scyld. However, I need redhat 7.2 for an
>application that I will be using. So I decided to
>remove some nodes from the existing cluster to create
>a new cluster running rh7.2. I removed three nodes
>from the existing cluster to do this. All three have
>the same configuration.
>
>For the moment, I decided not to configure ethernet on
>the master node. This cluster  will just have a local
>network. I will set up access to the internet once I
>get the cluster ready and going (Should not be too
>hard I hope)
>
>I read some installation guides from the internet.
>None of them are very good. One of these days, some
>body will have to write a REAL beowulf-setup howto ,
>but I am digressing... I basically followed what was
>found in the pondermatic website.
>
>I installed redhat 7.2 on all three machines. Assigned
>them hostnames of alpha, beta and gamma.
>I set up ethernet such that their IP addresses were 
>alpha:192.168.0.100
>beta :192.168.0.101
>gamma:192.168.0.102
>(they are connected through a linksys switch, btw)
>
>using netconfig, I added hosts (beta and gamma to
>alpha),  (alpha and gamma to beta) and (alpha and beta
>to gamma) on all three machines. I guess this in
>essence adds those hosts to /etc/hosts. I also added 
>/etc/hosts.equiv files to include all three machine
>names.
>
>I also installed lamd on all three machines.
>
>Theoretically, if all is setup correctly, I have a
>beowulf cluster. But things are never that easy, are
>they??
>
>I can ping all the machines from every other machine. 
>However, I can not rsh from one machine to another.
>e.g., from alpha, typing "rsh beta ls" does nothing. I
>can see the machnines trying to communicate via the
>blinking LED s in the switch, but nothing happens on
>the screen.
>
>What could be the possible reasons? 
>
>On all three machines, I  have a /etc/hosts file
>/ets/hosts.equiv file and a hosts.allow file which all
>list alpha, beta and gamma.
>
>Any help would be appreciated. I  have spent three
>frustrating days trying to figure this out to no
>avail.
>
>I also have a few other questions.
>According to the current setup, there is no true
>master and slave. All the machines have equal
>priority. That seems kind of strange to me. Is there
>anything I need to do differently while configuring
>the machines so that there is a true master and other
>slaves?
>
>Thanks
>
>Looking forward to some help
>
>Stephanie
>
>The University of Michigan
>
>
>
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