[GE users] Question about qrsh setup

Simon Gao gao at schrodinger.com
Wed Nov 28 18:49:26 GMT 2007


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Hi,

I have a few questions about how qrsh/qlogin works.

On page  http://gridengine.sunsource.net/howto/qrsh_qlogin_ssh.html,
there are following settings for rsh_daemon and rlogin_daemon:

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

Set the parameters rsh_daemon and rlogin_daemon in your cluster
configuration to ssh:

    *

      rsh_daemon: /usr/sbin/sshd -i

    *

      rlogin_daemon: /usr/sbin/sshd -i

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


1. On which node (submission or compute node), the
rlogin_daemon/rsh_daemon runs? does a new ssh daemon process got started
by each qrsh/qlogin? If so, by which user, root or the user who submit
the job?
2. Since ssh daemon already runs on every node, why each job submitted
by qrsh needs to start its own ssh daemon process? Why can those jobs
use the already running ssh daemon process?
3. Do jobs submitted via qrsh use different ssh port in each connection?
4. Since rsh_command and rlogin_command has been set up to point to ssh
command, isn't it already enough?

5. Is it secure to have to SGE to start a new ssh daemon process?

Thanks,

Simon

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