/etc/openmpi/openmpi-default-hostfile is in openmpi-bin 1.4.3-2.1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
# University Research and Technology
# Corporation. All rights reserved.
# Copyright (c) 2004-2005 The University of Tennessee and The University
# of Tennessee Research Foundation. All rights
# reserved.
# Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
# University of Stuttgart. All rights reserved.
# Copyright (c) 2004-2005 The Regents of the University of California.
# All rights reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
# This is the default hostfile for Open MPI. Notice that it does not
# contain any hosts (not even localhost). This file should only
# contain hosts if a system administrator wants users to always have
# the same set of default hosts, and is not using a batch scheduler
# (such as SLURM, PBS, etc.).
#
# If you are primarily interested in running Open MPI on one node, you
# should *not* simply list "localhost" in here (contrary to prior MPI
# implementations, such as LAM/MPI). A localhost-only node list is
# created by the RAS component named "localhost" if no other RAS
# components were able to find any hosts to run on (this behavior can
# be disabled by excluding the localhost RAS component by specifying
# the value "^localhost" [without the quotes] to the "ras" MCA
# parameter).
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