Using third-party tools that interact with the Cloud API

Let's look at an example of running HashiCorp Packer to build a virtual machine instance image that is preconfigured with your application:

{
   variables : {
     do_api_token : {{env `DIGITALOCEAN_ACCESS_TOKEN`}} ,
     region : fra1 ,
     packages : "customer"
     version : 1.0.3
  },
   builders : [
    {
       type : digitalocean ,
       api_token : {{user `do_api_token`}} ,
       image : ubuntu-20-04-x64 ,
       region : {{user `region`}} ,
       size : 512mb ,
       ssh_username : root
    }
  ],
  provisioners: [
    {
       type : file ,
       source : ./{{user `package`}}-{{user `version`}}.deb ,
       destination : /home/ubuntu/
    },
    {
       type : shell ,
       inline :[
         dpkg -i /home/ubuntu/{{user `package`}}-{{user `version`}}.deb
      ]
    }
  ]
}

In the preceding code, we provide the required credentials and region and employ a builder to prepare an instance from the Ubuntu image for us. The instance...