There're lots of tutorials for ssh login without password available online. such as

http://linuxproblem.org/art_9.html
http://linuxwave.blogspot.com/2007/07/ssh-without-password.html


HZ Liu

2010/4/2 Huynh Thuc Cuoc <htcuoc@gmail.com>
Thank you very much.
After that I try with the mpirun:
[guser1@ioitg2 examples]$ /opt/openmpi/bin/mpirun -np 10 --hostfile myhosts ring_cxx
guser1@node1.ioit-grid.ac.vn's password:guser1@node2.ioit-grid.ac.vn's password:

This request passwd to login to nodes, but 2 massages in the line, I can only success with one node, the 2sd. refussed.
So, how I can do as you advise, to login to each node without being prompted for a password. ?
What I need to do. Help me.
I run openmpi 1.2.9 supporting SGE (when I buil with --with-sge). I had tested to buil with 1.3. or 1.4. with this option I saw the error no recognize --with-sge. Why ? bug or ? While docs README shows that this is supported. I need this because I run SUN gridengine on may cluster. You have some ideals ?
Thank you very much.
Sincerely.
HTCuoc

On Wed, Mar 31, 2010 at 5:43 PM, Jeff Squyres (jsquyres) <jsquyres@cisco.com> wrote:
Yes, you need to install open mpi on all nodes and you need to be able to login to each node without being prompted for a password.

Also, not that v1.2.7 is pretty ancient. If you're juist starting with open mpi, can you upgrade to the latest version?

-jms
Sent from my PDA. No type good.

From: users-bounces@open-mpi.org <users-bounces@open-mpi.org>
To: users@open-mpi.org <users@open-mpi.org>
Sent: Wed Mar 31 03:39:08 2010
Subject: [OMPI users] Help om Openmpi

Dear all,
I had install my cluster which the configuration as following:
- headnode :
  + linux CenOS 5.4, 4 CPUs, 3G RAM
  + sun gridengine sge6.0u12. The headnode is admin and submit node too.
  + Openmpi 1.2.9. In the installation openmpi :.configure --prefix=/opt/openmpi --with-sge ...Processes complilation and make was fine.
  + I have 2 others nodes which confg. are: 4 CPU, 1 G RAM and on which run sgeexecd.
Testing for SGE on headnode and nodes by qsub was fine.
When testing openmpi with as folowing:
[guser1@ioitg2 examples]$ /opt/openmpi/bin/mpirun -np 4 --hostfile myhosts hello_cxx
Hello, world!  I am 0 of 4
Hello, world!  I am 1 of 4
Hello, world!  I am 3 of 4
Hello, world!  I am 2 of 4
[guser1@ioitg2 examples]$

The openmpi runs well.
My file myhosts:
ioitg2.ioit-grid.ac.vn slots=4
node1.ioit-grid.ac.vn slots=4
node2.ioit-grid.ac.vn slots=4

Now for more processes:
[guser1@ioitg2 examples]$ /opt/openmpi/bin/mpirun -np 6 --hostfile myhosts hello_cxx
guser1@node1.ioit-grid.ac.vn's password:
--------------------------------------------------------------------------
Failed to find the following executable:

Host:       node1.ioit-grid.ac.vn
Executable: hello_cxx

Cannot continue.
--------------------------------------------------------------------------
mpirun noticed that job rank 0 with PID 19164 on node ioitg2.ioit-grid.ac.vn exited on signal 15 (Terminated).
3 additional processes aborted (not shown)
[guser1@ioitg2 examples]$

This is error massage. I was login on node1 successful.

PLS, Help me. What problems I have 9installation, configurations, ...). Have I install openmpi on all nodes ?

Thank you very much and I am waitting your helps.




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