1. 修改时区

rm -rf /etc/localtime
ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
vim /etc/sysconfig/clock
ZONE="Asia/Shanghai"
UTC=false
ARC=false

2. 安装并设置开机启动

    yum install -y ntp
    systemctl start ntpd
    systemctl enable ntpd

3. 配置开机启动校验

vim /etc/rc.d/rc.local
/usr/sbin/ntpdate ntp1.aliyun.com > /dev/null 2>&1; /sbin/hwclock -w

4. 配置定时任务

crontab -e
0 */1 * * * ntpdate ntp1.aliyun.com > /dev/null 2>&1; /sbin/hwclock -w