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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
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