The software configures Network Manager to ignore some network devices

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NetworkManager is a daemon that can dynamically control and configure the network, corresponding to the NetworkManager.service service, the default profile path / etc/NetworkManager/NetworkManager.conf. Starting with RHEL/CentOS 7, network functions are provided by default by NetworkManager in the form of services. The server version of Ubuntu does not enable NetworkManager by default.

By default, NetworkManager manages all devices except lo (loopback) devices. However, in the container environment, many network devices are created by network drivers, and the control of container network devices by NetworkManager may lead to abnormal cluster network communication. Because container-related devices need to be set to unmanaged so that NetworkManager ignores these devices.

View device status # View device management status

Nmcli device status

Temporary unmanaged

If it is only a temporary test, you can use the nmcli command to set a network device to the unmanaged state. However, as soon as the NetworkManager service is restarted or the host is restarted, the network interface will return to the managed state.

Nmcli device set xxx managed no

Permanent unmanaged

To permanently exclude NetworkManager from managing some network devices, you need to set it through a configuration file.

Enable plug-in

Enable the plug-in keyfile under the [main] level of the / etc/NetworkManager/NetworkManager.conf configuration file.

[main]

Plugins=keyfile

Create a / etc/NetworkManager/conf.d/99-unmanaged-devices.conf configuration file that contains the following:

[keyfile]

Unmanaged-devices=interface-name:eth*,except:interface-name:eth0;interface-name:docker0;interface-name:flannel*;interface-name:flannel*;interface-name:cni0;;mac:66:77:88:99:00:aa

Separate by semicolon

You can use wildcards to match interfaces

Interface-name:eth*,except:interface-name:eth0; said: except for eth0, all other interfaces that begin with eth are unmanaged.

Interfaces can be excluded by mac address

Reload configuration

Systemctl reload NetworkManager

Disable Network Manager

Configuration errors, or untimely configuration updates, can lead to unnecessary problems. If you do not have to use NetworkManager services, it is generally recommended to disable NetworkManager services.

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