Pour installer docker sur Debian 8 Jessie, il faut soit activer "jessie-backports" ( http://backports.debian.org/Instructions/#index3h2 ).
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curl -sSL https://get.docker.com/ | sh

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Ajouter l'utilisateur à ceux qui peuvent utiliser docker :
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usermod -aG docker simon

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Tester docker :
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$ sudo docker run --rm hello-world
[sudo] password for simon:
Unable to find image 'hello-world:latest' locally
latest: Pulling from hello-world
a8219747be10: Pull complete
91c95931e552: Already exists
hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd18681cf5daeb82aab55838d
Status: Downloaded newer image for hello-world:latest
Hello from Docker.
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:

1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
   (Assuming it was not already locally available.)
3. The Docker daemon created a new container from that image which runs the
   executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
   to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

For more examples and ideas, visit:
http://docs.docker.com/userguide/
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