dockerd | Docker Documentation
https://docs.docker.com/engine/reference/commandline/dockerdDaemon storage-driver. On Linux, the Docker daemon has support for several different image layer storage drivers: aufs, devicemapper, btrfs, zfs, overlay, overlay2, and fuse-overlayfs. The aufs driver is the oldest, but is based on a Linux kernel patch-set that is unlikely to be merged into the main kernel. These are also known to cause some serious kernel crashes.