From the docker manual:
- The
vfs
storage driver is intended for testing purposes, and for situations where no copy-on-write filesystem can be used. Performance of this storage driver is poor, and is not generally recommended for production use.
You may want to read Docker storage drivers | Docker Docs and change to either aufs
or overlay2
.
Following our official install guide in a Ubuntu 18.04 server will give you a supported storage driver.