ami.json

{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": "",
    "source_ami": "ami-xxxxxxxx"
  },
  "builders": [{
    "type": "amazon-ebs",
    "region": "us-west-2",
    "source_ami": "{{user `source_ami`}}",
    "instance_type": "t2.micro",
    "ssh_username": "ec2-user",
    "ami_name": "jw-packer-{{timestamp}}"
  }],
  "provisioners": [{
    "type": "shell",
    "inline": [
      "sudo yum install --enablerepo=epel -y ansible"
    ]
  },
  {
    "type": "ansible-local",
    "playbook_file": "ami.yml"
  }]
}