How to troubleshoot when the disk space is full in Linux?

When the Linux disk space is full, you can follow the steps below to troubleshoot the issue:

1. Check the disk space usage: By using the df -h command, you can display the usage of each disk partition in the system, including total space, used space, remaining space, etc. Identify the partitions with higher space usage.
2. Check folder space usage: Use the command du -h –max-depth=1 to view the size of each folder in the specified directory. You can enter the larger folders one by one to continue using this command to find specific files or subfolders.
3. Check the log files: In a Linux system, log files can take up a lot of disk space. You can use the command du -h /var/log/ to view the size of the log folder and check for any excessively large log files.
4. Delete unnecessary files and logs: If you come across any files or logs that are no longer needed, you can use the rm command to delete them. Additionally, you can use the command > to clear a specific log file.
5. Check temporary files: The accumulation of temporary files may also lead to disk space issues. You can use the command ls -lh /tmp to check the size of the temporary folder and use the rm command to delete temporary files that are no longer needed.
6. Check the database files: If a database server is deployed on the server, the database files may also take up a large amount of space. Utilize the database management tools to clean up unnecessary data or compress the files.
7. Identify and remove invalid soft links: At times, soft links may point to files that have been deleted or moved, but the soft link itself still exists, taking up disk space. You can use the command “find -L / -type l -delete” to locate and delete these invalid soft links.
8. Check for system junk files: Some system junk files may also take up disk space. You can use the ‘apt-get clean’ command to clear the APT cache, and use the ‘yum clean all’ command to clean the Yum cache.
9. Check other processes: There may be some processes running that are generating a large number of temporary or log files. You can use the command lsof | grep deleted to search for files taking up a lot of disk space in these running processes.
10. To increase disk space: If the previous steps do not free up enough disk space, consider expanding the disk space by using LVM or adding a new disk.

These are some common troubleshooting steps that can be selected based on the specific situation.