The operational problem it solves
docker-data-move.sh is valuable when Docker has quietly grown until the root filesystem is almost full, but you still need a safe and repeatable migration path.
Instead of editing daemon.json and moving directories by hand under pressure, the script turns that migration into a more structured workflow with checks and backups.
Where it fits best
It works best on long-running hosts where Docker was originally installed onto the default root disk, but growth later forced the team to relocate the data-root.
- Single-node services where Docker data has outgrown the original disk
- Handoffs where you want a documented, repeatable migration procedure
- Teams that need a safer path than ad hoc rsync plus config edits
When to slow down first
If the host carries production traffic, unfamiliar storage layouts, or strict change-control requirements, use the script as a documented aid, not as an excuse to skip review.
The best workflow is still to inspect the target path, verify backup expectations, and communicate the restart window before running the move.