install docker on debian jessie

# ## may fail because no apt-tansport-https... go ahead.
# sudo apt-get update
# sudo apt-get dist-upgrade -y 

# requires apt-transport-https
sudo apt-get install apt-transport-https -y

# get docker apt repo
sudo apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo echo "deb https://apt.dockerproject.org/repo debian-jessie main" | sudo tee /etc/apt/sources.list.d/docker.list

# update and get docker repo list -  install the 
sudo apt-get update
sudo apt-get install docker-engine -y

# ## only if you want it runnig al the time..
## sudo service docker start

# user to docker group, to be able use 'docker' without sudo.
sudo adduser $USER docker