src/sagemaker_training/mpi.py [448:488]:
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        self._tear_down()
        return process_spawned


_SSH_DAEMON_NOT_FOUND_ERROR_MESSAGE = """
SSH daemon not found, please install SSH to allow MPI to communicate different nodes in cluster.

You can install ssh by running following commands:
-------------------------------------------------

1. Install SSH via apt-get:

apt-get update && apt-get install -y --no-install-recommends openssh-server && mkdir -p /var/run/sshd

2. SSH login fix. Otherwise user is kicked off after login:
sed 's@session\\s*required\\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd

3. Create SSH key to allow password less ssh between different docker instances:
mkdir -p /root/.ssh/ && ssh-keygen -q -t rsa -N '' -f /root/.ssh/id_rsa && \
  cp /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys && \
  printf "Host *\n  StrictHostKeyChecking no\n" >> /root/.ssh/config
"""


def _start_sshd_daemon():  # type: () -> None
    sshd_executable = "/usr/sbin/sshd"

    if not os.path.exists(sshd_executable):
        raise RuntimeError(_SSH_DAEMON_NOT_FOUND_ERROR_MESSAGE)

    subprocess.Popen([sshd_executable, "-D"])


def _can_connect(host, port=22):  # type: (str, int) -> bool
    """Check if the connection to provided ``host`` and ``port`` is possible.

    Args:
        host (str): Hostname for the host to check connection.
        port (int): Port name of the host to check connection on.
    """
    try:
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src/sagemaker_training/smdataparallel.py [360:401]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        self._tear_down()
        return process_spawned


_SSH_DAEMON_NOT_FOUND_ERROR_MESSAGE = """
SSH daemon not found, please install SSH to allow MPI to communicate different nodes in cluster.

You can install ssh by running following commands:
-------------------------------------------------

1. Install SSH via apt-get:

apt-get update && apt-get install -y --no-install-recommends openssh-server && mkdir -p /var/run/sshd

2. SSH login fix. Otherwise user is kicked off after login:
sed 's@session\\s*required\\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd

3. Create SSH key to allow password less ssh between different docker instances:
mkdir -p /root/.ssh/ && ssh-keygen -q -t rsa -N '' -f /root/.ssh/id_rsa && \
cp /root/.ssh/id_rsa.pub /root/.ssh/authorized_keys && \
printf "Host *\n  StrictHostKeyChecking no\n" >> /root/.ssh/config
"""


def _start_sshd_daemon():  # type: () -> None
    sshd_executable = "/usr/sbin/sshd"

    if not os.path.exists(sshd_executable):
        raise RuntimeError(_SSH_DAEMON_NOT_FOUND_ERROR_MESSAGE)

    subprocess.Popen([sshd_executable, "-D"])


def _can_connect(host, port=22):
    # type: (str, int) -> bool
    """Check if the connection to provided ``host`` and ``port`` is possible.

    Args:
        host (str): Hostname for the host to check connection.
        port (int): Port name of the host to check connection on.
    """
    try:
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