#安装ntp服务
yum install ntp
#开机启动服务
systemctl enable ntpd
#启动服务
systemctl start ntpd
#更改时区
timedatectl set-timezone Asia/Shanghai
2、修改默认配置文件
vim /etc/ntp.conf
# Hosts on local network are less restricted. #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap #设置ntp1.aliyun.com可以修改本地系统时间 restrict ntp.aliyun.com nomodify notrap noquery #设置阿里云NTP服务器 server ntp.aliyun.com server ntp1.aliyun.com server ntp2.aliyun.com server ntp3.aliyun.com server ntp4.aliyun.com server ntp5.aliyun.com server ntp6.aliyun.com server ntp7.aliyun.com # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst #server 3.centos.pool.ntp.org iburst#注释以上默认NTP服务器
3、重启服务
#重启NTP服务
systemctl restart ntpd
4.进行单词时间同步
#单次同步时间 ntpdate ntp.aliyun.com
#启用ntp同步 timedatectl set-ntp yes
5.查看同步状态
ntpq -p #查看NTP服务同步状态，见下面输出代表成功
remote refid st t when poll reach delay offset jitter ============================================================================== 120.25.115.20 10.137.53.7 2 u 9 64 1 47.461 0.578 0.000
