CentOS 中有network和NetworkManager两个网络管理器，两者不可兼容
以下是对
NetworkManager这个网络管理器的应用说明
1. 查看状态
systemctl status NetworkManager
2. 关闭服务
systemctl stop NetworkManager
3. 开启服务
systemctl start NetworkManager
4. 重启服务
systemctl restart NetworkManager
5. 查看是否开机启动
systemctl is-enabled NetworkManager
6. 打开开机启动
systemctl enable NetworkManager
7. 关闭开机启动
systemctl disable NetworkManager
8. 打开某一网卡服务
nmcli connection up eno1-static 打开静态IP网卡服务
nmcli connection up eno2-dhcp 打开动态IP网卡服务
9. 关闭某一网卡服务
nmcli connection up eno1-static 关闭静态IP网卡服务
nmcli connection up eno2-dhcp 关闭动态IP网卡服务
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