Run a remote command in several machines, using just one password

fabfile.py

from fabric.api import run


def execute(command):
    run(command, shell=True)

run.py

#!/usr/bin/env python

import os
import argparse
import subprocess


class RunException():
    pass


def hosts(cluster):
    path = cluster
    if not os.path.exists(path):
        raise RunException('Cluster not found')
    with open(path) as fd:
        return ','.join(fd.read().splitlines())


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Process some integers.')
    parser.add_argument('cluster', nargs=1,
                        help='Cluster where commands should be run')

    parser.add_argument('command', nargs='+',
                        help='Command')
    parser.add_argument('-u', '--user',
                        default=os.getlogin(),
                        help='select another user')

    args = parser.parse_args()

    try:
        command = 'fab -u "{user}" -H "{hosts}" execute:"{script}"'.format(
            script=' '.join(args.command).replace('"', '\"'),
            hosts=hosts(args.cluster[0]),
            user=args.user
        )
        subprocess.call(command, shell=True)
    except RunException as e:
        print(e)

1. Create a file with a name of host per host in cluster. Use the cluster name as filename.
2. Run "run.py CLUSTER -- COMMAND"
   Example:

$ cat cluster.txt
localhost
$ ./run.py cluster.txt -- echo hello
[localhost] Executing task 'execute'
[localhost] run: echo hello
[localhost] Passphrase for private key: 
[localhost] out: hello
[localhost] out: 


Done.
Disconnecting from localhost... done.

And you can use Fabric directly:

$ fab execute:"echo hello world" -H "$(cat cluster.txt)"                                                         
[localhost] Executing task 'execute'
[localhost] run: echo hello world
[localhost] Passphrase for private key: 
[localhost] out: hello world
[localhost] out: 


Done.
Disconnecting from localhost... done.