[GE users] SSH and host keys

reuti reuti at staff.uni-marburg.de
Wed Feb 18 11:02:50 GMT 2009

Am 16.02.2009 um 20:36 schrieb crhea:

> I'm missing something here...
> Right now, I'm using RSH between the nodes. I have /root/.rhosts  
> and /etc/hosts.equiv set up to allow passwordless RSH.
> We've run into the issue of rsh reaching a number of ports limit  
> (discussed elsewhere in the SGE forums) and I'd like to look at  
> running SSH. I understand your ssh_known_hosts script, but I'm  
> unclear what system(s) this file needs to be populated-- The  
> master? The exec hosts?

You mean for parallel jobs, as you wrote "between" the nodes. Hence  
all exec hosts must trust the other exec hosts.


This seems working up to the point, when SSH calls PAM. Then PAM  
denies access. I'm still looking to get it working. (For now I set it  
up with passphrase-less user based authentication which will also  
work in clusters [on sites where they need SSH as I on my own prefer  
the rsh/built-in method in a private cluster], but this has to be  
done for each user.)

> The submission hosts?  Is this done for root only, or do I need to  
> pre-load something for
> all user accounts too?

The known_hosts file you have to implement for each user, or common  
in /etc/ssh/ssh_known_hosts.

-- Reuti

> I'm not understanding what hosts need to trust what...
> Thanks-
> --- Cris
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