exemple of packer file

gistfile1.txt

variables": {
    "vsphere_server":            "myhost.com",
    "vsphere_network":            "mynet",
    "vsphere_datacenter":         "mydc",
    "vsphere_cluster":            "mycluster",
    "vsphere_resource_pool":      "mypool",
    "vsphere_datastore":          "myds",
    "vsphere_folder":             "myfdlr",
    "vsphere_host":               "myvshost",
    "vm_disk_size": "40000",
    "vm_ram_size": "4096",
    "vm_cpu_size": "2",
    "vsphere_guest_os_type":  "rhel7_64Guest",
    "vm_name":                "centos-test",
    "iso_checksum_type": "sha256",
    "iso_checksum": "38d5d51d9d100fd73df031ffd6bd8b1297ce24660dc8c13a3b8b4534a4bd291c",
    "iso_url": "http://ftp.ember.se/centos/7.6.1810/isos/x86_64/CentOS-7-x86_64-Minimal-1810.iso",
    "vm_ssh_password": "root",
    "vm_ssh_username": "root"
    },
    "builders": [
      {
        "type": "vsphere-iso",
  
        "vcenter_server":           "{{user `vsphere_server`}}",
        "insecure_connection":      "true",
        "username":                 "{{user `vsphere_username`}}",
        "password":                 "{{user `vsphere_password`}}",
  
        "datacenter":               "{{user `vsphere_datacenter`}}",
        "cluster":                  "{{user `vsphere_cluster`}}",
        "host":                     "{{user `vsphere_host`}}",
        "datastore":                "{{user `vsphere_datastore`}}",      
        "folder":                   "{{user `vsphere_folder`}}",
  
        "vm_version": 13,
        "vm_name": "{{user `vm_name`}}",
        "guest_os_type": "{{user `vsphere_guest_os_type`}}",
        "notes": "centos 7.6 generate by packer {{ isotime }}",
  
        "communicator": "ssh",
        "ssh_username":  "{{user `vm_ssh_username`}}",
        "ssh_password":  "{{user `vm_ssh_password`}}",

        "convert_to_template": true,
  
        "CPUs":  "{{user `vm_cpu_size`}}",
        "RAM":  "{{user `vm_ram_size`}}",
        "disk_size": "{{user `vm_disk_size`}}",
        "disk_thin_provisioned": true,
        "disk_controller_type": "pvscsi",
        "network_card": "vmxnet3",
        "network":      "{{user `vsphere_network`}}",
  
        "iso_urls": [
            "{{user `iso_url`}}"
        ],
        "iso_checksum_type" :"{{user `iso_checksum_type`}}",
        "iso_checksum" : "{{user `iso_checksum`}}",
  
        "floppy_files": [
          "{{ template_dir }}/ks.cfg"
        ],
  
        "boot_wait": "10s",
  
        "boot_command": [
          "<tab>",
          " text inst.ks=hd:fd0:/ks.cfg net.ifnames=0 biosdevname=0",
          "<wait>",
          "<enter>",
          "<wait>",
          "<enter>"
        ]
      }
    ],
    "provisioners": [
      {
        "type": "shell",
        "environment_vars": [
          "centos_pub_key={{user `centos_pub_key`}}"
        ],
        "scripts": [
          "scripts/add_user.sh"
        ]
      },
      {
        "type": "shell",
        "inline": [
          "echo {{user `centos_private_key`}} > /home/centos/.ssh/id_rsa ",
          "chmod 0600 /home/centos/.ssh/id_rsa",
          "chown -v -R centos:centos /home/centos/.ssh",
          "echo {{user `centos_password`}} | passwd centos --stdin",
          "echo {{user `root_new_password`}} | passwd root --stdin"
        ]
      }
    ]
  }