系统环境：
OS：CentOS Stream 9
CentOS Stream 9Unlike previous versions CentOS, there are no previous network setting related commands, such as:
service network start/restart/status
systemctl start/restart/status network
IPThe configuration file for setting the network card is also /etc/sysconfig/network-scriptno longer found in the directory, so let’s see how to CentOS Stream 9configure static IP. Of course, the easiest way is to open the settings and modify them with a graphical interface. The operation steps are clear at a glance, and will not be described in this article.
1. Open the network card configuration file
CentOS Stream 9Move the network card configuration file in /etc/NetworkManager/system-connections/the directory , open the corresponding network card configuration file:
[imaginemiracle@localhost ~]$ sudo vim /etc/NetworkManager/system-connections/ens192.nmconnection
2. Modify configuration ipv4 item
When the file is opened, the default configuration should be as shown in the figure below:
configure the [ipv4]item as manual mode, and set it to specified IP:
[注]：在配置文件中，不要擅自添加空格，可能会造成无法识别。
3. Reload the network card configuration file
Reload the network card configuration file:
[imaginemiracle@localhost ~]$ sudo nmcli c reload
[imaginemiracle@localhost ~]$ sudo nmcli c up ens192
Use ifconfigthe command to view the configuration information of the network card, and the modification is successful.
This configuration is complete
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