Terraform Notes

providers contains the domain specific knowledg eneeded to provision

resources (e.g., aws, azure, vmware, etc.)

provisioners allow you to perform DSR after the resource is provisioned

• local-exec runs a command on the local machine

Variables

• Simple variable types: string number bool Example variable definition:

variable "my-var" {
    type = string
}

• Complex variable types: list set map object * tuple

• Use "${var.WS_ACCESS_KEY} to refer to a variable

Organization

• provider.tf contains provider specific info vars.tf contains the variable defintions terraform.tfvars contains variable assignments

Functions

• Allow you to retrieve and manipulate data Samples: lookup() extracts variable values based on a key

Getting output from a terraform apply

• Output can be used to display variable

output "ip" {
  value = "${aws_instance.aws-ec2.public_ip}"
}

Remote state

• Terraform stores its state in the terraform.tfstate file Storing state locally can lead to conflicts The state file can be stored remoetly using a different backed. Back-ends available: Consul S3 w/ dynamodb locking Terraform Enterprise * Steps to configure remote state:

terraform {
    backend "consul" {
        address = "demo.consul.io"
        path = "terraform/hermanwebapp"
    }
}

terraform {
    backend "s3" {
        bucket = "mattys-bucket"
        key = "terraform/hemanwebapp"
        region = "us-east-1"
    }
}

• You cannot use variables in your backend stanzas * S3 and consul backends support locking