build.json

{
  "min_packer_version": "1.0.4",
  "variables": {
    "aws_region": "us-east-1",
    "ami_base_name": "",
    "gcp_project_id": "",
    "gcp_zone": "us-central1-a",
    "oci_availability_domain": "",
    "oci_base_image_ocid": "",
    "oci_compartment_ocid": "",
    "oci_pass_phrase": "",
    "oci_subnet_ocid": ""
  },
  "builders": [{
    "type": "amazon-ebs",
    "ami_name": "{{user `ami_base_name`}}-terratest-packer-example",
    "ami_description": "An example of how to create a custom AMI on top of Ubuntu",
    "instance_type": "t2.micro",
    "region": "{{user `aws_region`}}",
    "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
  }, {
    "type": "googlecompute",
    "image_name": "terratest-packer-example-{{isotime | clean_image_name}}",
    "image_family": "terratest",
    "project_id": "{{user `gcp_project_id`}}",
    "source_image_family": "ubuntu-1804-lts",
    "zone": "{{user `gcp_zone`}}",
    "ssh_username": "ubuntu"
  }, {
    "type": "oracle-oci",
    "image_name": "terratest-packer-example-{{isotime}}",
    "availability_domain": "{{user `oci_availability_domain`}}",
    "base_image_ocid": "{{user `oci_base_image_ocid`}}",
    "compartment_ocid": "{{user `oci_compartment_ocid`}}",
    "pass_phrase": "{{user `oci_pass_phrase`}}",
    "shape": "VM.Standard2.1",
    "ssh_username": "ubuntu",
    "subnet_ocid": "{{user `oci_subnet_ocid`}}"
  }],
  "provisioners": [{
    "type": "shell",
    "inline": [
      "sudo DEBIAN_FRONTEND=noninteractive apt-get update",
      "sudo DEBIAN_FRONTEND=noninteractive apt-get upgrade -y"
    ]
  }]
}