no running containers, but there is on on the disk:

$ docker ps -as
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES               SIZE
f6239f10a6ad        hello-world         "/hello"            8 seconds ago       Exited (0) 7 seconds ago                       lucid_snyder        0 B (virtual 1.84 kB)

There is also an image

gabor@air mydocker $ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              48b5124b2768        6 weeks ago         1.84 kB