Docker Compose exposed port test

docker-compose-test.sh

# Create test VM with Vagrant.
mkdir testvm && cd testvm
vagrant init geerlingguy/ubuntu1804
# (Edit created Vagrantfile and uncomment `config.vm.network "private_network"` line)

# Start the VM and log in.
vagrant up
vagrant ssh

# Flush iptables rules (allow access to any port).
sudo iptables -F

# Install Docker and Docker Compose.
sudo apt-get -y install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository  "deb [arch=amd64] https://download.docker.com/linux/ubuntu  $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get -y install docker-ce
sudo curl -L "https://github.com/docker/compose/releases/download/1.25.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

# Run a container with an exposed port with a Docker Compose file.
nano docker-compose.yml

# Contents of docker-compose.yml:
version: "3.7"
services:
  http:
    image: tutum/hello-world
    ports:
      - "127.0.0.1:80:80"

# Start the Docker Compose environment.
sudo docker-compose up -d

# Test inside the VM (should return a 200 OK)
curl --head http://localhost/

# Test outside the VM (should _not_ respond)
curl --head http://192.168.33.10/