Inital provision of an ubuntu 18.04 host with git and docker

host-init.sh

#!/bin/bash

# This system should run ONLY:
#
# git - to handle version control for system files
# docker - to handle ALL services
#
apt-get update || exit 1

if [ -z "`which git`" ]; then
  echo "install git"
  apt-get install -y --no-install-recommends git
fi

if [ -z "`which docker`" ]; then
  echo "install docker"
  apt-get install -y --no-install-recommends \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
  add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
  apt-get update
  apt-get install  -y --no-install-recommends docker-ce docker-ce-cli
fi

if [ -z "`which docker-compose`" ]; then
  echo "install docker-compose"
  curl -L "https://github.com/docker/compose/releases/download/1.24.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
  chmod +x /usr/local/bin/docker-compose
fi