aufs
A union filesystem storage driver used by early Docker on Ubuntu, removed in Docker Engine 24.
In more detail
overlay2 replaced it on every distribution. Hosts still using it had to change drivers before upgrading.
Related terms
- storage driver — The part of the Docker daemon that decides how image layers and container writable layers are stored on disk.
- OverlayFS — The Linux union filesystem Docker uses to stack image layers into a container root directory.
- devicemapper — A block-level Docker storage driver built on Linux thin provisioning, deprecated and removed in Docker Engine 25.
Taught in
- Two Containers, How Much Disk? Storage Drivers, Layers And devicemapper — Docker Certified Associate (DCA) Exam Prep
- Storage Sprint: Eight Questions On Layers, Drivers And Volumes — Docker Certified Associate (DCA) Exam Prep