NTP服务

网络时钟校准

sh

yum install -y ntpdate

ntpdate ntp3.aliyun.com
28 Mar 21:36:10 ntpdate[2722]: the NTP socket is in use, exiting

搭建NTP服务

WARNING

ntpdate同步时钟时，不能同时有NTP服务运行，会有冲突

sh

yum install -y ntp

cat /etc/ntp.conf


systemctl start ntpd
systemctl status ntpd # 默认端口123，UDP协议