How to resolve insufficient space in the CentOS root directory?

When the CentOS root directory is running out of space, you can choose from the following solutions:

1. Clean up temporary files: Use the tmpwatch command to remove temporary files. For example, you can run tmpwatch 7d /tmp to delete files in the /tmp directory that are older than seven days.
2. Remove unnecessary software packages: Use the yum or dnf command to uninstall unneeded software packages. For example, you can run yum autoremove to delete packages that are no longer needed.
3. Clean up log files: Use the logrotate command to clean up log files. For example, you can run logrotate -f /etc/logrotate.conf to forcefully clean up all log files.
4. Move files to another disk: You can transfer some large files occupying space to another disk. For example, you can move some log files or backup files to another disk.
5. To expand the root partition: If the above methods do not solve the problem, consider increasing the size of the root partition. Begin by backing up important data. Then, use partitioning tools like fdisk or parted to extend the root partition. Finally, use the resize2fs command to adjust the file system size.

Before expanding the root partition, make sure to use the correct partitioning tool and method, and backup important data. For users who are not familiar with partitioning and file system operations, it is recommended to seek help from professionals.