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Puede encontrar la ayuda completa en esta página https://docs.docker.com/installation/
DEBIAN https://docs.docker.com/installation/debian/
Hay diferencias entre la version 8 (jessie) y las anteriores.
Para la version 8:
Make sure you enabled the jessie-backports repository, as stated above.
To install the latest Debian package (may not be the latest Docker release):
apt-get update apt-get install docker.io
To verify that everything has worked as expected:
docker run –rm hello-world
This command downloads and runs the hello-world image in a container. When the container runs, it prints an informational message. Then, it exits.