def exec_command(shell_cmd, hostname=None):
    if hostname:
        p = Popen('/usr/bin/ssh -Tq '+hostname, shell=True, stdout=PIPE, stdin=PIPE)
        p.stdin.write(str.encode(shell_cmd))
        p.stdin.flush()
    else:
        p = Popen(shell_cmd, shell=True, stdout=PIPE, stdin=PIPE)
    
    stdout, stderr = p.communicate()
    return stdout, stderr, p.poll()