Along with Docker's efforts, there are others working on container-based storage. This landscape[1] lists Ceph, Gluster, but also Portworx, Minio, Diamanti, Dell EMC's Rex-Ray, and SolidFire. I think also folks like StorageOS and Supergiant and frankly the whole storage & platform industry players are running in this direction. [1] https://github.com/cncf/landscape