template_ami.json

{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": ""
  },
  "builders": [{
    "type": "amazon-ebs",
    "access_key": "{{user `aws_access_key`}}",
    "secret_key": "{{user `aws_secret_key`}}",
    "region": "eu-west-1",
    "source_ami_filter": {
      "filters": {
      "virtualization-type": "hvm",
      "name": "amzn-ami-hvm-*",
      "root-device-type": "ebs"
      },
      "owners": ["137112412989"],
      "most_recent": true
    },
    "instance_type": "t2.micro",
    "ssh_username": "ec2-user",
    "ami_name": "packer-ami {{timestamp}}"
  }],
  "provisioners": [{
      "type": "file",
      "source": "scripts",
      "destination": "/home/ec2-user/"
    },    
    {
      "type": "shell",
      "scripts": [
        "scripts/prepare.sh"
      ]
    },
    {
      "type": "file",
      "source": "ansible",
      "destination": "/home/ec2-user/"
    },
    {
      "type": "ansible",
      "playbook_file": "ansible/provision_host.yml"
    },
    {
      "type": "shell",
      "scripts": [
        "scripts/cleanup.sh"
      ]
    }]
}