docker_install

#docker engine
sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
sudo subl /etc/apt/sources.list.d/docker.list // para ubuntu 14.04, remover tudo e adicionar: deb https://apt.dockerproject.org/repo ubuntu-trusty main
sudo apt-get update
sudo apt-get purge lxc-docker
sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
sudo apt-get update
sudo apt-get install docker-engine
sudo service docker start

#docker compose
cd ~ && curl -OL https://github.com/docker/compose/releases/download/1.8.1/docker-compose-`uname -s`-`uname -m` && sudo chmod a+x docker-compose-`uname -s`-`uname -m` && sudo mv `pwd`/docker-compose-`uname -s`-`uname -m` /usr/local/bin/docker-compose
docker-compose --version

sudo groupadd docker
sudo usermod -aG docker $USER
#Log out and log back in.
docker run hello-world
#If this fails with a message similar to this:
#Cannot connect to the Docker daemon. Is 'docker daemon' running on this host?
#Check that the DOCKER_HOST environment variable is not set for your shell. If it is, unset it.