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resource "digitalocean_domain" "default" {
  name       = "example.com"
  ip_address = "${digitalocean_droplet.default.ipv4_address}"
}

resource "digitalocean_droplet" "default" {
  name   = "lemp-server"
  image  = "lemp-16-04"
  region = "nyc1"
  size   = "512mb"

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provider "digitalocean" {
  token = "7d50acd89ca3b...8cde9a059828b"
}

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$ terraform plan

Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.


------------------------------------------------------------------------

An execution plan has been generated and is shown below.

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variable "variable_name" {
  type        = "string|list|map"
  default     = ""
  description = "A human-friendly description for the variable"
}

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variable "do_token" {
  description = "DigitalOcean API Token"
}

variable "domain" {
  description = "Domain name the service should be located on"
}

variable "droplet_name" {
  description = "Droplet name in DigitalOcean Control Panel"

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

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$ TF_VAR_do_token=7d50acd89ca3...8cde9a059828b TF_VAR_domain=example.com TF_VAR_droplet_name=lemp_server terraform apply

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$ export TF_VAR_do_token=7d50acd89ca3...8cde9a059828b TF_VAR_domain=example.com TF_VAR_droplet_name=lemp_server
$ terraform apply

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$ terraform apply
var.do_token
  DigitalOcean API Token

  Enter a value:▐

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do_token = "7d50acd89ca3...8cde9a059828b"
domain = "example.com"
droplet_name = "lemp_server"