Terraform Providers

Overview

• Allow Terraform to interact with cloud providers, SaaS providers and other APIs
• Must declare which providers will be used in the config
  • So Terraform can install

Configuration

• Belong in root module
  • Child modules receive config from root module
• Can use expressions in config arguments, but values must be known at apply-time (e.g. input variables)

Meta-Arguments

• Available to all providers
• alias—for using the same provider with different config for different resources
• version—deprecated (use provider requirements instead)

Example: alias

provider "aws" {
  region = "us-east-1"
}
 
provider "aws" {
  alias = "west"
  region = "us-west-2"
}
 
resource "aws_instance" "foo" {
  provider = aws.west
 
  # ...
}
 
resource "aws_instance" "bar" {
  # Uses default provider, i.e. us-east-1
 
  # ...
}