Packer example

snap.json

{
  "variables": {
    "api_token": "{{env `DO_TOKEN`}}"
  },
  "builders": [
    {
      "api_token": "{{user `api_token`}}",
      "type": "digitalocean",
      "region": "sgp1",
      "image": "ubuntu-16-04-x64",
      "size": "512mb",
      "snapshot_name": "ubuntuz-{{timestamp}}",
      "ssh_username": "root",
      "private_networking": true,
      "monitoring": true
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "scripts": [
        "./ubuntu/setup-swapfile.sh",
        "./ubuntu/secure-auto-update.sh",
        "./ubuntu/secure-ip-spoofing.sh",
        "./ubuntu/secure-shared-memory.sh",
        "./ubuntu/secure-sysctl.sh",
        "./ubuntu/secure-fail2ban.sh",
        "./ubuntu/secure-ufw.sh",
        "./cleanup/cleanup-ubuntu.sh"
      ]
    }
  ]
}