terraform-getting-started.md

Terraform Getting Started

Install Terraform

brew update
brew tap hashicorp/tap
brew install hashicorp/tap/terraform
terraform -help

terraform -install-autocomplete

File structure

• provider.tf
• variables.tf
• resource-group.tf
• your-resource.tf

# provider.tf

terraform {
  backend "azurerm" {
    resource_group_name  = "tstate"
    storage_account_name = "deepeyeststate"
    container_name       = "tstate"
    key                  = "sekyee.tfstate"
  }

  required_version = ">=0.12"

  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~>2.0"
    }
  }
}

provider "azurerm" {
  features {}
}

# variables.tf

variable "location" {
  type    = string
  default = "UK South"
}

variable "appname" {
  type    = string
  default = "sekyee"
}
variable "environment" {
  type    = string
  default = "dev"
}

# resource-group.tf

resource "azurerm_resource_group" "sekyee" {
  name      = "${var.appname}-rg"
  location  = var.location
}

Running the terraform scripts

terraform init
terraform fmt
terraform plan

Conventions

It's handy to use app name + environment

resource "azurerm_cosmosdb_sql_database" "cdb" {
  name                = "${var.appname}-${var.environment}"
  resource_group_name = data.azurerm_cosmosdb_account.cda.resource_group_name
  account_name        = data.azurerm_cosmosdb_account.cda.name
  throughput          = 400
}

String Templates

Interpolation

"Hello, ${var.name}"

Directives

"Hello, %{ if var.name != "" }${var.name}%{ else }unnamed%{ endif }!"

<<EOT
%{ for ip in aws_instance.example.*.private_ip }
server ${ip}
%{ endfor }
EOT

Whitespace Stripping

<<EOT
%{ for ip in aws_instance.example.*.private_ip ~}
server ${ip}
%{ endfor ~}
EOT