How to troubleshoot insufficient space in the root directory in Linux?

There are several ways to troubleshoot insufficient disk space in the root directory of Linux.

1. Check the disk usage using the df command.
2. Show information about disk usage in a human-readable format.
3. This command will display usage information for all mount points, including the root directory. You can review the usage of the root directory and other mount points to identify which directories are taking up a significant amount of space.
4. Find large files or directories using the du command.
5. Display the top 10 largest directories in the root directory, sorted by size.
6. This command will list the top 10 largest files or directories in the root directory, allowing you to identify the ones taking up the most space by examining the output.
7. Search for and clean up log files.
8. Search for files larger than 100MB in the /var/log directory and display their details using the ls -lh command.
9. This command will list files in the /var/log directory that are larger than 100MB, allowing you to delete or archive any unnecessary log files in order to free up space.
10. Clean up temporary files.
11. Delete all files in the /tmp directory using superuser privileges.
12. This command will remove all temporary files and free up space.
13. Check for any temporary files or processes that have not been deleted.
14. Display all processes with at least one file descriptor open.
15. This command will list all deleted but still open files, allowing you to locate and delete these files to free up space.

During troubleshooting, other possible causes of insufficient space should also be considered, such as backup files and abnormal log file rolling.