This article provides a detailed step-by-step guide to setting up a Terraform backend with Amazon S3. The guide is aimed at those who are new to Terraform and want to learn how to use it to manage their infrastructure in the cloud. The article explains what Terraform is, the benefits of using Amazon S3 as a backend for Terraform, and provides a clear walkthrough of the steps required to set up the Terraform backend with S3.
What is Terraform?
Terraform is an open-source infrastructure as code (IaC) tool developed by HashiCorp that enables users to define and provision their infrastructure through code. Terraform uses a declarative language to describe infrastructure resources and their dependencies, allowing for the creation, modification, and destruction of resources in a safe and predictable manner. With Terraform, users can manage infrastructure resources across various cloud providers and on-premises data centers using a unified workflow. Terraform’s ability to manage infrastructure as code can greatly simplify the process of infrastructure provisioning and management, allowing for more efficient and consistent deployments.
What is Terraform State?
Terraform state is a snapshot of the resources and their configurations that Terraform manages in a particular infrastructure. It represents the current state of the infrastructure that Terraform is aware of, and it is stored locally on the Terraform user’s machine or remotely in a backend. Terraform uses the state to plan and apply changes to the infrastructure. The state is critical to Terraform’s functionality, as it helps Terraform determine the actions required to achieve the desired infrastructure configuration and ensure that the infrastructure is in the desired state.
When you run
terraform apply or
terraform destroy, Terraform creates or modifies infrastructure resources in your cloud provider based on the code you've written in your Terraform configuration files. It needs to keep track of what it has created, what changes have been made, and what needs to be updated or destroyed if changes are made to the configuration.