ntpd使用chrony同步
关闭selinux（他会导致chrony失败）
sudo setenforce 0
sudo nano /etc/selinux/config
SELINUX=disabled
启动
sudo systemctl status chronyd
sudo systemctl start chronyd
10.168.16.64主节点
vi /etc/chrony.conf
注释掉全部server
添加local stratum 10
其他节点
sudo systemctl status chronyd
sudo systemctl start chronyd
vi /etc/chrony.conf
注释掉server
加上
server 10.168.16.64 iburst
全部重启，除了主节点
sudo systemctl restart chronyd
sudo systemctl enable chronyd
chronyc sources
