start a container from a container, with volumes.

docker volume tests

docker@boot2docker:~$ pwd
/home/docker
docker@boot2docker:~$ docker run -it -v $(pwd)/foo:/foo -v /var/run/docker.sock:/var/run/docker.sock sse/jenkins bash
jenkins@ccfdbe3ccaac:/$ ls /foo/
bar  foofoo
jenkins@ccfdbe3ccaac:/$ docker run -it -v /home/docker/foo/bar:/bar debian:jessie bash  # <-- /!\
root@be6343378d9a:/# ls /bar
baz
root@be6343378d9a:/# date > /bar/bar
root@be6343378d9a:/# exit
jenkins@ccfdbe3ccaac:/$ cat /foo/bar/bar
Fri Sep  4 12:33:17 UTC 2015