[Docker] Install Docker to linux system

Debian：
# / sudo curl -fsSL https://get.docker.com/ | sh
# / sudo usermod -aG docker vodka

Or
# / echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources.list
# / sudo apt-get update
# / deb https://apt.dockerproject.org/repo debian-jessie main
(or => deb http://apt.dockerproject.org/repo debian-jessie main)
# / sudo apt-get update
# / sudo apt-cache policy docker-engine
# / sudo apt-get install docker-engine
# / sudo service docker start


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