build.json

{
  "variables": {
    "aws_region": "us-east-1",
    "ami_name_base": "terratest-packer-docker-example"
  },
  "builders": [{
    "name": "ubuntu-ami",
    "ami_name": "{{user `ami_name_base`}}-{{isotime | clean_ami_name}}",
    "ami_description": "An example of how to create a custom AMI with a simple web app on top of Ubuntu",
    "instance_type": "t2.micro",
    "region": "{{user `aws_region`}}",
    "type": "amazon-ebs",
    "source_ami_filter": {
      "filters": {
        "virtualization-type": "hvm",
        "architecture": "x86_64",
        "name": "*ubuntu-xenial-16.04-amd64-server-*",
        "block-device-mapping.volume-type": "gp2",
        "root-device-type": "ebs"
      },
      "owners": ["099720109477"],
      "most_recent": true
    },
    "ssh_username": "ubuntu",
    "encrypt_boot": false
  },{
    "name": "ubuntu-docker",
    "type": "docker",
    "image": "gruntwork/ubuntu-test:16.04",
    "commit": true
  }],
  "provisioners": [{
    "type": "shell",
    "inline": [
      "echo 'Sleeping for a few seconds to give Ubuntu time to boot up'",
      "sleep 30"
    ],
    "only": ["ubuntu-ami"]
  },{
    "type": "file",
    "source": "{{template_dir}}",
    "destination": "/tmp/packer-docker-example"
  },{
    "type": "shell",
    "inline": ["/tmp/packer-docker-example/configure-sinatra-app.sh"]
  }],
  "post-processors": [{
    "type": "docker-tag",
    "repository": "gruntwork/packer-docker-example",
    "tag": "latest",
    "only": ["ubuntu-docker"]
  }]
}