a-terraform-sequence-to-deploy-a-droplet.sh

terraform init  

export TF_LOG=1
export SSH_FP=$(ssh-keygen -E md5 -lf ~/.ssh/id_rsa.pub | awk '{print $2}'| cut -c5-)
export DO_PAT={YOUR_PERSONAL_ACCESS_TOKEN}

terraform plan \
  -var "do_token=${DO_PAT}" \
  -var "pub_key=$HOME/.ssh/id_rsa.pub" \
  -var "pvt_key=$HOME/.ssh/id_rsa" \
  -var "ssh_fingerprint=${SSH_FP}"
  
terraform apply \
  -var "do_token=${DO_PAT}" \
  -var "pub_key=$HOME/.ssh/id_rsa.pub" \
  -var "pvt_key=$HOME/.ssh/id_rsa" \
  -var "ssh_fingerprint=${SSH_FP}"  

k8s-master-01.tf

resource "digitalocean_droplet" "k8s-master-01" {
    image = "ubuntu-16-04-x64"
    name = "k8s-master-01"
    region = "nyc3"
    size = "1gb"
    private_networking = true
    ssh_keys = [
      "${var.ssh_fingerprint}"
    ]
    connection {
      user = "root"
      type = "ssh"
      private_key = "${file(var.pvt_key)}"
      timeout = "2m"
  }
  provisioner "remote-exec" {
    inline = [
      "export PATH=$PATH:/usr/bin",
      # install nginx
      "sudo apt-get update",
      "sudo apt-get -y install htop glances"
    ]
  }
}

provider.tf

variable "do_token" {}
variable "pub_key" {}
variable "pvt_key" {}
variable "ssh_fingerprint" {}

provider "digitalocean" {
  token = "${var.do_token}"
}