packer.json

{
  "variables": {
    "aws_access_key": "{{env `AWS_ACCESS_KEY_ID`}}",
    "aws_secret_key": "{{env `AWS_SECRET_ACCESS_KEY`}}",
    "aws_session_token": "{{env `AWS_SESSION_TOKEN`}}",
    "source_ami": ""
  },
  "builders": [
    {
      "type": "amazon-ebs",
      "access_key": "{{user `aws_access_key`}}",
      "secret_key": "{{user `aws_secret_key`}}",
      "token": "{{user `aws_session_token`}}",
      "region": "us-west-2",
      "source_ami": "{{user `source_ami`}}",
      "instance_type": "t2.small",
      "user_data_file": "{{template_dir}}/../../setup_winrm.txt",
      "ami_name": "server-name {{timestamp}}",
      "communicator": "winrm",
      "winrm_username": "Administrator",
      "vpc_id": "vpc-**********",
      "subnet_id": "subnet-**********"
    }
  ],

  "provisioners": []
}