How to free up space in the CentOS root directory when it is running low on storage?

If there is not enough space in the CentOS root directory, you can follow these steps to free up space:

1. Delete unnecessary temporary and log files: navigate to the root directory (/) and use the following command to delete any unnecessary temporary and log files:
2. Remove all files and directories in the /tmp and /var/log directories.
3. Clean YUM cache: Use the following command to clean YUM cache:
4. Clear all cached package data using yum.
5. Clean up old kernels: Use the following command to remove old kernels:
6. Remove old kernels using the package cleanup tool, keeping only one kernel.
7. Clean up package cache: Use the following command to clean up package cache:
8. Use the command “sudo yum clean packages” to clear the package cache.
9. Remove unnecessary software packages: Use the following command to delete installed packages that are no longer needed:
10. Remove all unnecessary packages
11. Remove unnecessary user files: Check and delete user files that are no longer needed, such as downloaded files, temporary files, etc.

Before performing any deletion operation, make sure that you no longer need these files and back them up to prevent accidentally deleting important files.