On Mon, 2005-10-10 at 00:27 +0800, [log in to unmask] wrote:
> Thank John and Barry (Barry Branch of FIU) for the kind replies.
> 
> It is tempting to configure MPICH to use ssh in place of rsh.
Well, the other reason to do this is on very large clusters 
there is a limit on the number of ports rsh can have open.
There is a way to alter this in the kernel.
But to be honest, just use rsh.


> Perhaps I will write some script to add user to the cluster system
> so that the public keys of the user is automatically generated
> and added to the authorized_keys files of all other nodes automatically.
> Otherwise it may be a pain to help each new user to setup the
> connection, isn't it? Is there any better idea?
That is a good idea.

I wrote a simple script that users would run, to generate passwordless
keys.
In fact, the site I Was working with used a script to generate temporary
keys which are used once only.
Google for 'rocks' 'ssh' 'mpich' 'temporary' and I think you will find a
script.