Example: Packer template with multiple amazon-chroot builders with Ansible as provisioner

main.json

{
  "variables": {
    "aws_region": "{{env `xxxxxx`}}",
    "aws_env": "{{env `xxxxxx`}}",
    "default_ansible_roles": "xxxxxx",
    "base_name": "xxxxxx",
    "outcome_name": "xxxxxx",
    "application_name": "xxxxxx",
    "nexus_username": null,
    "nexus_password": null,
    "source_url": null,
    "application_version": null
  },
  "builders": [
    {
      "ami_name": "{{user `aws_env`}}-{{user `outcome_name`}}-01-{{user `application_version`}}-{{ timestamp }}",
      "sriov_support": true,
      "ena_support": true,
      "type": "amazon-chroot",
      "mount_options": [ "nouuid" ],
      "command_wrapper": "sudo {{.Command}}",
      "name": "xxxxxx-01",
      "region": "{{user `aws_region`}}",
      "tags": {
        "OsType": "xxxxxx",
        "OsDistribution": "xxxxxx",
        "OsVersion": "xxxxxx",
        "Timestamp": "{{ timestamp }}",
        "Name": "{{user `aws_env`}}-{{user `outcome_name`}}-01-{{user `application_version`}}",
        "Provisioner": "Packer",
        "Environment": "{{user `aws_env`}}",
        "Product": "{{user `outcome_name`}}",
        "Owner": "xxxxxx",
        "Department": "xxxxxx",
        "SourceUrl": "{{user `source_url`}}",
        "ApplicationVersion": "{{user `application_version`}}"
      },
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "name": "{{user `aws_env`}}-{{user `base_name`}}-*",
          "root-device-type": "ebs",
          "tag:Name": "{{user `aws_env`}}-{{user `base_name`}}"
        },
        "owners": [ "self" ],
        "most_recent": true
      }
    },
    {
      "ami_name": "{{user `aws_env`}}-{{user `outcome_name`}}-02-{{user `application_version`}}-{{timestamp}}",
      "sriov_support": true,
      "ena_support": true,
      "type": "amazon-chroot",
      "mount_options": [ "nouuid" ],
      "command_wrapper": "sudo {{.Command}}",
      "name": "xxxxxx-02",
      "region": "{{user `aws_region`}}",
      "tags": {
        "OsType": "xxxxxx",
        "OsDistribution": "xxxxxx",
        "OsVersion": "xxxxxx",
        "Timestamp": "{{ timestamp }}",
        "Name": "{{user `aws_env`}}-{{user `outcome_name`}}-02-{{user `application_version`}}",
        "Provisioner": "Packer",
        "Environment": "{{user `aws_env`}}",
        "Product": "{{user `outcome_name`}}",
        "Owner": "xxxxxx",
        "Department": "xxxxxx",
        "SourceUrl": "{{user `source_url`}}",
        "ApplicationVersion": "{{user `application_version`}}"
      },
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "name": "{{user `aws_env`}}-{{user `base_name`}}-*",
          "root-device-type": "ebs",
          "tag:Name": "{{user `aws_env`}}-{{user `base_name`}}"
        },
        "owners": [ "self" ],
        "most_recent": true
      }
    },
    {
      "ami_name": "{{user `aws_env`}}-{{user `outcome_name`}}-03-{{user `application_version`}}-{{timestamp}}",
      "sriov_support": true,
      "ena_support": true,
      "type": "amazon-chroot",
      "mount_options": [ "nouuid" ],
      "command_wrapper": "sudo {{.Command}}",
      "name": "xxxxxx-03",
      "region": "{{user `aws_region`}}",
      "tags": {
        "OsType": "xxxxxx",
        "OsDistribution": "xxxxxx",
        "OsVersion": "xxxxxx",
        "Timestamp": "{{ timestamp }}",
        "Name": "{{user `aws_env`}}-{{user `outcome_name`}}-03-{{user `application_version`}}",
        "Provisioner": "Packer",
        "Environment": "{{user `aws_env`}}",
        "Product": "{{user `outcome_name`}}",
        "Owner": "xxxxxx",
        "Department": "xxxxxx",
        "SourceUrl": "{{user `source_url`}}",
        "ApplicationVersion": "{{user `application_version`}}"
      },
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "name": "{{user `aws_env`}}-{{user `base_name`}}-*",
          "root-device-type": "ebs",
          "tag:Name": "{{user `aws_env`}}-{{user `base_name`}}"
        },
        "owners": [ "self" ],
        "most_recent": true
      }
    }
  ],
  "provisioners": [
    {
      "type": "ansible-local",
      "playbook_file": "main.yml",
      "group_vars": "../../../group_vars",
      "role_paths": [
        "roles/an_deploy"
      ],
      "extra_arguments": [
        "--connection=chroot",
        "--inventory-file=/mnt/packer-amazon-chroot,",
        "--extra-vars \"aws_env={{user `aws_env`}} application_name={{user `application_name`}}  nexus_username={{user `nexus_username`}} nexus_password={{user `nexus_password`}} source_url={{user `source_url`}}\""
      ]
    }
  ]
}