What are the techniques for recycling Debian system

This article introduces several effective ways to free up disk space in Debian systems. Be sure to back up important data before performing any actions.

1. Volume Management:

• Check disk usage: Use vgs and pvs commands to check the usage of volume groups and physical volumes.
• Delete useless logical volumes: Use the lvremove command to delete logical volumes that are no longer needed. For example: sudo lvremove /dev/mapper/debianOA--vg-lv_data (please replace with the actual logical volume path).

2. Package management:

• Uninstall useless software: Use apt-get autoremove command to automatically uninstall no longer needed packages and their dependencies.
• Clean the APT cache: apt-get clean command cleans the downloaded package cache.
• Completely uninstall the software: Use apt-get purge command to completely delete the package and its configuration files.

3. Clean up temporary files and logs:

• Clean temporary files: Use apt-get autoclean command to clean temporary files and caches.
• Clean the log: Use journalctl --vacuum-time=7d command to clean the log files 7 days ago (the time parameters can be adjusted).

4. Manually clean files and directories:

• Delete files and directories: Use rm (file), rmdir (empty directory), rm -r (non-empty directory) commands to delete unnecessary files and directories. Use the rm -rf command with caution, it will force delete all files and subdirectories, make sure that the operation is correct.

5. Disk space analysis:

• Check disk usage: Use the df -h command to view disk space usage of each partition.
• Analyze disk occupancy: Use the ncdu tool to analyze disk space occupancy to find the file or directory that takes up the most space.

6. Virtual machine disk expansion (if applicable):

• Adjust virtual machine settings: Increase the virtual disk size in the virtual machine management software.
• Resize partitions: Use fdisk or parted commands to adjust partitions (advanced operations, be careful).
• Extend logical volume: Use the lvextend command to extend the logical volume and use the corresponding command to extend the file system (such as resize2fs ).

7. Disk quota management (optional):

• Set disk quota: Use the quota command to set the disk quota for users and groups to limit their disk usage.

Please note that the commands and operations of different Debian versions may vary slightly. It is recommended to refer to your official Debian version documentation for more detailed information. Before doing any operation, emphasize again: be sure to back up important data!

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