packer template

{
  "variables": {
      "cpus": "2",
      "disk_size": "20000",
      "memory": "2048",
      "keep_registered": "false",
      "switch_name": "external",
      "iso_checksum": "md5:aba7e22636c435c5008f5d059ae69a62",
      "iso_checksum_type": "md5",
      "iso_name": "ubuntu-20.04.2-live-server-amd64.iso",
      "vm_name": "ubuntu20_packer",
      "ssh_username": "admin",
      "ssh_password": "MyPassWd!"
  },
  "builders": [
    {
      "type": "hyperv-iso",
      "disk_size": "{{ user `disk_size` }}",
      "cpus": "{{ user `cpus` }}",
      "memory": "{{ user `memory` }}",
      "floppy_files": [],
      "http_directory": "./http/",
      "vm_name": "{{ user `vm_name` }}",
      "switch_name": "{{ user `switch_name` }}",
      "generation": 1,
      "enable_dynamic_memory": true,
      "enable_secure_boot": false,
      "temp_path": "./hyperv_vms",
      "headless": false,
      "shutdown_command": "echo '{{ user `ssh_password` }}' | sudo -S -E shutdown -P now",
      "communicator": "ssh",
      "ssh_username": "{{ user `ssh_username` }}",
      "ssh_password": "{{ user `ssh_password` }}",
      "iso_urls": [
	      "{{ user `iso_name` }}"
       ],

      "ssh_timeout": "180m",
      "iso_checksum": "{{ user `iso_checksum` }}",
      "ssh_handshake_attempts": "90",
      "boot_wait": "4s",
      "skip_export": true,
      "keep_registered": false,
      "boot_command": [
        "<enter><enter><f6><esc><wait> ",
        "autoinstall ds=nocloud-net;s=http://{{ .HTTPIP }}:{{ .HTTPPort }}/cloud-init/",
        "<enter><wait>"
      ]
    }
  ]
}