How to resolve the issue of the network service not starting in CentOS 7?

There could be several reasons why the network service in CentOS 7 fails to start.

1. There is an error in the network configuration file: it may be due to incorrect or missing configurations in /etc/sysconfig/network-scripts/ifcfg-eth0. First, check if the configurations in this file are correct, including IP address, subnet mask, gateway, etc. If there are any errors, correct them and restart the network service.
2. Network card driver issue: It could be caused by a missing or incorrect network card driver. You can use the lspci command to check the network card model and make sure the correct driver is installed. If there are issues with the network card driver, you can try reinstalling or updating the driver.
3. Network services not installed: This may be due to network services not being installed or not being installed correctly. You can use the following command to check the installation status of the network services and reinstall them:
4. List all installed packages containing the word “network” using the yum package manager.
5. If the network service is not installed, you can use the following command to install it:
6. Install the network using yum with superuser permissions.
7. Internet service configuration error: It may be caused by errors in the network service configuration file /etc/sysconfig/network. You can check if the configurations in that file are correct and correct them.
8. There may be an issue with the network hardware causing the problem. You can try unplugging and re-plugging the network cable, or using a different network interface to determine if it is a hardware problem.

If those methods above don’t work, you can try upgrading the operating system or contact the network administrator for further troubleshooting.