Install Docker, Docker Compose and NTP

init.sh

#!/bin/bash

# stop execution if error
set -e

export DEBIAN_FRONTEND=noninteractive

# pre-requirements
apt-get update
apt-get upgrade -y
apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common

# add Docker's official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

# verify that the key fingerprint is 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88
apt-key fingerprint 0EBFCD88

# add Docker repo
sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

# update the apt package index
apt-get update

# install Docker Community Edition
apt-get install -y docker-ce

# allow user 'ubuntu' to manage Docker
usermod -aG docker ubuntu

# install Docker Compose
curl -L https://github.com/docker/compose/releases/download/1.13.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
docker-compose --version

# ntp daemon will periodically keep any clock drift in check
apt-get -y install ntp