How to set IP in CentOS9

Just for record, I found that there are still huge differences between CentOS9 and my most commonly used CentOS7.X, such as the location of the network card file, the command to restart the network card, the content of the network configuration file, etc., so I recorded it so that I can look it up next time I encounter it, so that I don’t have to use the search engine every time, especially when most of the search results are useless information.

The CentOS9 network card configuration file path is in the /etc/NetworkManager/system-connections/ directory, similar to files such as enp2s0.nmconnection (where enp2s0 is the name of the network card)

As shown above, you can see all the files in the folder. There are as many files as there are network cards on the machine. You can select the corresponding file to modify. For example, the network card we are using here is enp2s0

 [connection]
id=enp2s0
uuid=17562457-5af0-1137-4cea-637e1f345447
type=ethernet
autoconnect-priority=-999
interface-name=enp2s0

[ethernet]

[ipv4]
address1=192.168.1.2/29,192.168.1.1
dns=8.8.8.8;
method=manual

[ipv6]
addr-gen-mode=eui64
method=auto

After modification, save, exit, and restart the network card.

 nmcli c reload # Reload the configuration file nmcli c up enp2s0 # Restart the enp2s0 network card

Note that service and systemctl in centos9 system can no longer be used to operate network cards