tidb 安装deploy-ntp.yml失败，什么原因？

在同步时间服务的时候报错，信息如下.实际上我配置的时间服务器的IP就是如下的10.188.100.103，在

执行$ansible-playbook -i hosts.ini deploy_ntp.yml -u tidb -b 命令之前，时间服务器是启动了的，机器之间的时间服务也是同步了，

但就是报如下错，目前没有找到原因。导致tidb的集群安装进行不下去

TASK [Adjust Time | start to adjust time with 10.188.100.103] ******************

fatal: [10.188.100.103]: FAILED! => {"changed": true, "cmd": "ntpdate 10.188.100.103", "delta": "0:00:08.106175", "end": "2019-05-13 15:48:58.136810", "msg": "non-zero return code", "rc": 1, "start": "2019-05-13 15:48:50.030635", "stderr": "13 May 15:48:58 ntpdate[7573]: no server suitable for synchronization found", "stderr_lines": ["13 May 15:48:58 ntpdate[7573]: no server suitable for synchronization found"], "stdout": "", "stdout_lines": []}
fatal: [10.188.99.194]: FAILED! => {"changed": true, "cmd": "ntpdate 10.188.100.103", "delta": "0:00:08.107849", "end": "2019-05-13 15:48:58.151947", "msg": "non-zero return code", "rc": 1, "start": "2019-05-13 15:48:50.044098", "stderr": "13 May 15:48:58 ntpdate[6822]: no server suitable for synchronization found", "stderr_lines": ["13 May 15:48:58 ntpdate[6822]: no server suitable for synchronization found"], "stdout": "", "stdout_lines": []}
to retry, use: --limit @/home/tidb/tidb-ansible/retry_files/deploy_ntp.retry