Docker storage drivers

A Docker storage driver is the main component to enable and manage container images. Two main technologies are used for that—copy-on-write and stackable image layers. The storage driver is designed to handle the details of these layers so that they interact with each other. There are several drivers available. They do pretty much the same job, but each and every one of them does it differently. The most common storage drivers are AUFS, Overlay/Overlay2, Devicemapper, Btrfs, and ZFS. All storage drivers can be categorized into three different types:

   
          
Storage driver category           
Storage drivers
       
          
Union filesystems           
AUFS, Overlay, Overlay2
       
          
Snapshotting filesystems           
Btrfs, ZFS
       
          
Copy-on-write block devices           
Devicemapper