Disable Network Manager on CentOS 8

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This article will provide the steps to disable NetworkManager in CentOS 8. NetworkManager is not compatible with some 3rd party software, such as cPanel, and must be disabled prior to installing the conflicting programs.

The following guide requires root-level permissions.

Disable NetworkManager for CentOS 8

To disable the NetworkManager in CentOS 8, perform the following steps:

From the command line, login as root user.

Run the commands:

sudo systemctl stop NetworkManager
sudo systemctl disable NetworkManager

Change to the /etc/sysconfig/network-scripts directory:
```
sudo cd /etc/sysconfig/network-scripts
```
Open the ifcfg-eth0 and ifcfg-lo files with your preferred text editor and, if they exist, set the following keys' values:
```
NM_CONTROLLED=no
ONBOOT=yes
```

Run the following commands to enable and restart the network service:

sudo systemctl enable network.service
sudo systemctl start network.service

NetworkManager service is now disabled and the network service is enabled.

Uninstall NetworkManager

To uninstall the NetworkManager, perform the following steps:

From the command line, login as root user.
Run the command:
```
sudo dnf remove NetworkManager -y
```

Network Manager has now been removed from your CentOS 8 server.

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