问题：移动云服务器，初始化系统后，ifconfig发现网卡eth0没有IP地址了，经过复盘，发现是关闭了NetworkManager，查看network（chkconfig --list），发现也是off。
解决方法一：关闭NetworkManager服务（网上常用方法）
[root@test ~]# systemctl disable NetworkManager
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
[root@test ~]# systemctl stop NetworkManager.service
#重启network即可
[root@test ~]# systemctl restart network
[root@test ~]# systemctl enable network
解决方法二：关闭network服务
[root@test ~]# systemctl stop network
[root@test ~]# systemctl disable network
#启动NetworkManager
[root@test ~]# systemctl enable NetworkManager.service
[root@test ~]# systemctl start NetworkManager.service
#network与NetworkManager差别
network是linux直接配置网卡的程序
NetworkManager是提供一个丰富的API来检查和控制网络设置和操作的应用程序
network和NetworkManager一起工作时就会出现冲突
