Verify the system time for NTP Client.

check_rtime.py

#!/usr/bin/python
# coding=utf-8

import os, paramiko
import time

hosts = [
    '172.16.16.198',
    '172.16.16.200'
    ]

pri_key_fn = '/home/terry/.ssh/id_rsa'
user_name = 'root'
ssh_port = 22


def get_rtime(hosts):
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    privatekey = os.path.expanduser(pri_key_fn)
    mkey = paramiko.RSAKey.from_private_key_file(privatekey)
    ssh.connect(hostname=hosts, port=ssh_port, username=user_name, \
                    password=None, pkey=mkey, timeout=2, allow_agent=True, \
                    look_for_keys=True, compress=False)
    stdin, stdout, stderr = ssh.exec_command('date +%s')
    rem_time = float('\n'.join(map(str, stdout.readlines())))
    ssh.close()
    return rem_time


def time_diff():
    #loc_time = time.mktime(time.localtime())
    loc_time = time.time()
    for ip in hosts:
        difference = get_rtime(ip) - loc_time
        if difference > 0:
            print("The remote server %s is later than local host %f s." \
                      % (ip, difference))
        elif difference < 0:
            print("The remote server %s is earlier than local host %f s." \
                      % (ip, abs(difference)))


if __name__ == '__main__':
    time_diff()