1.各个主机安装ntpdate

2.编写shell

#!/bin/sh

array=("root@master" "root@slave002" "root@slave003" "root@slave004" "root@slave005" "root@slave006"
"root@slave007" "root@slave008" "root@slave009" "root@slave010" "root@slave011"
"root@slave012" "root@slave013" "root@slave014" "root@slave015" "root@slave016" "root@slave017"
"root@client1"  "root@client2"  "root@client3"  "root@client4")
for i in "${array[@]}"
do
if [ ! -n $i ]
then
   echo "HOSTNAME IS NULL"
else
   ssh "$i" "ntpdate -u 6.6.1.52" #ssh登录
   echo "$i"
fi
done

3.上传到master服务器上去，定时执行时间同步

vim /etc/crontab加入
*/1 * * * * root /root/d.sh>>/root/log.txt 2>&1