https://www.youtube.com/watch?v=nvNqfgojocs

HashiCorp’s Terraform is an IaC(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.

Terraform supports Multi Cloud Infrastructures , Kubernetes , Docker & so on….

Terraform Core concepts

Below are the core concepts/terminologies used in Terraform:

• Variables: Also used as input-variables, it is key-value pair used by Terraform modules to allow customization.
• Provider: It is a plugin to interact with APIs of service and access its related resources.
• Module: It is a folder with Terraform templates where all the configurations are defined
• State: It consists of cached information about the infrastructure managed by Terraform and the related configurations.
• Resources: It refers to a block of one or more infrastructure objects (compute instances, virtual networks, etc.), which are used in configuring and managing the infrastructure.
• Data Source: It is implemented by providers to return information on external objects to terraform.
• Output Values: These are return values of a terraform module that can be used by other configurations.
• Plan: It is one of the stages where it determines what needs to be created, updated, or destroyed to move from real/current state of the infrastructure to the desired state.
• Apply: It is one of the stages where it applies the changes real/current state of the infrastructure in order to move to the desired state