docker + docker-compose on Amazon Linux

docker.json

{
  "variables": {
    "aws_access_key": "{{env `AWS_ACCESS_KEY`}}",
    "aws_secret_key": "{{env `AWS_SECRET_KEY`}}"
  },
  "builders": [
    {
      "type": "amazon-ebs",
      "ssh_pty": true,
      "access_key": "{{user `aws_access_key`}}",
      "secret_key": "{{user `aws_secret_key`}}",
      "region": "ap-northeast-1",
      "source_ami": "ami-1c1b9f1c",
      "instance_type": "t2.micro",
      "ssh_username": "ec2-user",
      "ami_name": "docker"
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "inline": [
        "sudo yum install -y docker",
        "sudo usermod -a -G docker ec2-user",
        "sudo curl -L https://github.com/docker/compose/releases/download/1.4.0/docker-compose-`uname -s`-`uname -m` | sudo tee /usr/local/bin/docker-compose > /dev/null",
        "sudo chmod +x /usr/local/bin/docker-compose"
      ]
    }
  ]
}

This doesn't get you the latest version of Docker Compose, plus you should use the "/usr/bin" directory as the "/usr/local/bin" directory is not included in AWS Path.