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Subject: [OMPI users] open-mpi ssh hostname problem
From: Bernhard Knapp (bernhard.knapp_at_[hidden])
Date: 2009-02-06 06:18:42


Dear users

I am using the parallel software Gromacs on Fedora8 nodes. I installed
the software and run it without problems but thereafter I moved the node
to our server-room and did the following:
- set ip adress, subnetmask and gateway
- changed the ssh port in /etc/ssh/sshd_config since we use port
forwarding on our router and /usr/sbin/semanage port -a -t
inetd_child_port_t -p tcp 5101
- changed the firewall settings to additionally allow the new port
- changed the hostname via hostname command

Then I started exactly the same simulation (same command, same data) as
before (before the network configuration) and it comes up with the
following error:

ssh: quoVadis01: Name or service not known
--------------------------------------------------------------------------
A daemon (pid 5039) died unexpectedly with status 255 while attempting
to launch so we are aborting.

There may be more information reported by the environment (see above).

This may be because the daemon was unable to find all the needed shared
libraries on the remote node. You may set your LD_LIBRARY_PATH to have the
location of the shared libraries on the remote nodes and this will
automatically be forwarded to the remote nodes.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun noticed that the job aborted, but has no info as to the process
that caused that situation.
--------------------------------------------------------------------------
mpirun: clean termination accomplished

Currently the simulation is only running in parallel on the local 4
cores and not using the network at all.

Why is it a problem for open-mpi to change the hostname from "localhost"
to "quoVadis01"? If i change the hostname back it works again. How can I
make open-mpi running using a hostname different to localhost. Simply to
reinstall mpi after changing the hostname does not help.

cheers
Bernhard