minimal_example.py

import sys

from pssh.exceptions import AuthenticationException
from pssh.clients import ParallelSSHClient
import pssh.utils

host = '192.168.255.1'
cmd = 'uname -a'

pssh.utils.enable_debug_logger()

client = ParallelSSHClient([host],
    user='myuser',
    pkey='~/.ssh/mykey',
    num_retries=1)

try:
    output = client.run_command(cmd)
except AuthenticationException:
    sys.exit(1)

for host_out in output:
    for line in host_out.stdout:
        print(line)

output.txt

2022-11-02 14:05:04,472 DEBUG    pssh.clients.base.parallel Make client request for host 192.168.255.1, (host_i, host) in clients: False
2022-11-02 14:05:04,525 DEBUG    pssh.clients.base.single Connecting to 192.168.255.1:22
2022-11-02 14:05:04,641 DEBUG    pssh.clients.base.single Proceeding with private key authentication
2022-11-02 14:05:04,641 DEBUG    pssh.clients.base.single Private key is provided in bytes, using as private key data
2022-11-02 14:05:04,652 ERROR    pssh.clients.base.parallel Failed to run on host 192.168.255.1 - ('Authentication error while connecting to %s:%s - %s - retries %s/%s', '192.168.255.1', 22, AuthenticationError(), 1, 1)