Terraform is an open-source infrastructure as code software tool created by HashiCorp. It enables users to define and provision a datacenter infrastructure using a high-level configuration language known as Hashicorp Configuration Language, or optionally JSON.
The key features of Terraform are
There are a bunch of reasons for giving preference to Terraform to be used as one of the significant tools of DevOps. The main motive of DevOps is to bring efficiency and quality in software delivery. For this, some tools are required for making the delivery smoother, faster and efficient. Here, terraform comes to the limelight where it aids organizations in automating and also aids with infrastructure as code. Terraform is helpful with its availability of implementing every type of coding principle. The extraordinary feature of terraforming includes its quickness and the operations performed by it. These are some of the important reasons for which Terraform is gaining popularity and attention in the organizations.
Terraform by HashiCorp, an AWS Partner Network (APN) Advanced Technology Partner and member of the AWS DevOps Competency, is an "infrastructure as code" tool similar to AWS CloudFormation that allows you to create, update, and version your Amazon Web Services (AWS) infrastructure.
In Terraform HCL stands for HashiCorp Configuration Language. It is a configuration language built by HashiCorp that is used to build a structured configuration language that is both human and machine-friendly for use with command-line tools but specifically targeted towards DevOps tools, servers, etc.
Ansible, Kubernetes, Packer, Cloud Foundry, and Pulumi are the most popular alternatives and competitors to Terraform.
Terraform is an open-source tool created by HashiCorp and written in the Go programming language.
The terraform CLI is a well-behaved command-line application. It is used to run commands for terraforming.
Below are few common Terraform commands:
Terraform provider is responsible for understanding API interactions and exposing resources. Providers generally are an IaaS (e.g. Alibaba Cloud, AWS, GCP, Microsoft Azure, OpenStack), PaaS (e.g. Heroku), or SaaS services (e.g. Terraform Cloud, DNSimple, Cloudflare).
Some Terraform providers are:
Provisioners in Terraform can be used to prepare servers or other infrastructure objects for service. It models specific actions on the local machine as well as on remote machines.
A module in Terraform is a container for several resources that are used together. The root module is compulsory for every terraform that includes resources mentioned in the .tf files.
Terraform Cloud is an application that let the teams use the Terraform together. It runs in a reliable environment and includes easy access to shared state and secret data. It provides access controls for adopting changes to infrastructure and a private registry for sharing terraform modules.
Features of the Terraform cloud are:
Terragrunt is a thin wrapper for Terraform that implements the practices advocated by the Terraform: Up and Running book. We've found Terragrunt helpful as it encourages versioned modules and reusability for different environments with some handy features, including recursive code execution in subdirectories.
Terraform state is a command that is used for advanced state management. The state is a necessary requirement for Terraform to function. Terraform must store state about your managed infrastructure and configuration. This state is used by Terraform to map real-world resources to your configuration, keep track of metadata, and to improve performance for large infrastructures. Syntax
terraform state [options] [args]
The terraform init is a command that is used to initialize a working directory containing Terraform configuration files. This is the first command that should be run after writing a new Terraform configuration or cloning an existing one from version control. It is safe to run this command multiple times.
terraform init [options] [DIR]