install-docker.sh

#!/bin/bash

# Install and configure docker.
# Based on https://docs.docker.com/engine/installation/linux/ubuntulinux/.
# ------------------------------------------------------------------------

# ------------------
#   Script setup
# ------------------

# Exit on failure.
set -e

# Check for root.
if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi

# ------------------------
#   Update apt sources
# ------------------------

# Update package information, ensure that APT works with the https method, and that CA certificates are installed.
apt-get update
apt-get install -y apt-transport-https ca-certificates

# Add the new GPG key.
apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D

# Update docker apt sources.
RELEASE_CODENAME=$(lsb_release --codename | cut -f2)
echo "deb https://apt.dockerproject.org/repo ubuntu-$RELEASE_CODENAME main" > /etc/apt/sources.list.d/docker.list

# Update the APT package index.
apt-get update

# Purge the old repo if it exists.
apt-get purge lxc-docker

# Verify that APT is pulling from the right repository.
apt-cache policy docker-engine


# -----------
#   Install
# -----------

# Install prerequisites.
# apt-get install linux-image-extra-$(uname -r)

# Install docker.
apt-get install -y docker-engine

# Start the docker daemon.
sudo service docker start

# Verify docker is installed correctly.
docker run hello-world