[GE users] Question about qrsh setup

Ron Chen ron_chen_123 at yahoo.com
Wed Nov 28 19:20:18 GMT 2007


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Some of your questions were answered in the presentation:

"Inside the SGE-SSH Integration" (aka: SGE-openSSH tight
integration)

http://gridengine.sunsource.net/workshop10-12.09.07/proceedings.html

Also see my comments below.

--- Simon Gao <gao at schrodinger.com> wrote: 
> 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?

See the presentation. And, sshd needs to be started by the root
user because some of the login process needs to be performed as
root.


> 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?

Some clusters do not want ssh access.

SGE's ssh is all under SGE's control. A user can't logon to a
node via SGE's ssh under it's via SGE.


> 3. Do jobs submitted via qrsh use different ssh port in each
> connection?

Yes, SGE allocates a new port.


> 4. Since rsh_command and rlogin_command has been set up to
> point to ssh command, isn't it already enough?

No, but it's a setup issue -- SGE install scripts do not know
the location of the SSH daemon.

And you can always compile your own SSH daemon so that you can
enable tight SGE-SSH support :-)


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

The SSH daemon does not run forever. And it does not listen to
login requests when the job is running.

 -Ron


> 
> Thanks,
> 
> Simon
> 
>
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