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Terraform Terraform Logo

About

Per Hashicorp Terraform is:

HashiCorp Terraform is an infrastructure as code tool that lets you define both cloud and on-prem resources in human-readable configuration files that you can version, reuse, and share. You can then use a consistent workflow to provision and manage all of your infrastructure throughout its lifecycle. Terraform can manage low-level components like compute, storage, and networking resources, as well as high-level components like DNS entries and SaaS features.

Some Pointers

  • There is state file that can be local stored, remote stored self-hosted, or remote hosted by Hashicorp
  • Providers are open sourced
  • Some providers won't be updated with Day 0 support
  • Terraform itself is cloud agnostic, providers aren't
  • When storing state remote, secrets are contained in plain text
  • Managing/tracking provider and Terraform versions
  • Multiple cloud and non cloud providers available
  • Best practice tends to have use lower case and _ in place of spaces

Basic Flow

Basic Terraform Workflow

Sourced from: Terraform.io

Providers

Providers are key factor when leveraging Terraform. >

Providers are a logical abstraction of an upstream API. They are responsible for understanding API interactions and exposing resources.

Providers are maintained via open source and usually are endorsed by the organization they are for.

PreReqs

Initializing Terraform

Before running any Terraform you need to initialized the working direction via terraform init.

For this repository just need to make sure the terminal is under the correct folder and simply run terraform init.

Validating Changes

Since Terraform depends on a state file to contain a definition of the resources associated with the Terraform file it does a really good job at detecting any changes.

This is done via terraform plan

For this repo it will look like: terraform plan -var-file="variables/dev.eus.variables.tfvars"

Deploying

Deployment is done using the terraform apply command..

In this repo it would be: terraform apply -var-file="variables/dev.eus.variables.tfvars"

Formatting

Terraform provides the ability to auto format your code. This can be accomplished via a terraform fmt command

For this repo all Terraform can be ran with a terraform fmt -recursive within the Terraform folder

Links