Post-installation procedure:
- create a user with constant uid/gid and shared home directory on all nodes
- ensure this user has rsh/ssh access to all nodes
For instance, a solution could be:
	# groupadd -g 12384 -r -f mpi 
	# useradd -u 12384 -g mpi -d /home/mpi -r -s /bin/bash mpi -p "" -m
	# mkpasswd -l 32 | passwd --stdin mpi 2>&1 > /dev/null
	# ssh-keygen -f /home/mpi/.ssh/id_dsa -t dsa -N "" 2>&1 > /dev/null
	# chown mpi:mpi /home/mpi/.ssh/id_dsa
	# chmod 600 /home/mpi/.ssh/id_dsa