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注：本文基于CentOS 8.4编写
CentOS 7中支持network.service和NetworkManager.service 2种方式配置网络，而在CentOS 8中已经废弃network.service，需要通过NetworkManager.service配置网络。因此通过systemctl restart network已经无法使用了。
[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 8.4.2105
[root@localhost ~]# systemctl restart network
Failed to restart network.service: Unit network.service not found.
方法一 使用nmcli命令，需要两条指令，先加载配置，然后应用
[root@localhost ~]# nmcli c reload
[root@localhost ~]# nmcli c up ens33
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/9)
方法二 使用ifdown和ifup
[root@localhost ~]# ifdown ens33;ifup ens33
Connection 'ens33' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/9)
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/10)
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