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Write, Plan, Apply

Terraform is an open-source infrastructure as code software tool that provides a consistent CLI workflow to manage hundreds of cloud services. Terraform codifies cloud APIs into declarative configuration files.
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Deliver Infrastructure as Code

resource "aws_instance" "iac_in_action" {
  ami               = var.ami_id
  instance_type     = var.instance_type
  availability_zone = var.availability_zone

  // dynamically retrieve SSH Key Name
  key_name = aws_key_pair.iac_in_action.key_name

  // dynamically set Security Group ID (firewall)
  vpc_security_group_ids = [aws_security_group.iac_in_action.id]

  tags = {
    Name = "Terraform-managed EC2 Instance for IaC in Action"
  }
}

resource "aws_instance" "iac_in_action" {  ami               = var.ami_id  instance_type     = var.instance_type  availability_zone = var.availability_zone   // dynamically retrieve SSH Key Name  key_name = aws_key_pair.iac_in_action.key_name   // dynamically set Security Group ID (firewall)  vpc_security_group_ids = [aws_security_group.iac_in_action.id]   tags = {    Name = "Terraform-managed EC2 Instance for IaC in Action"  }}

Write

Write infrastructure as code using declarative configuration files. HashiCorp Configuration Language (HCL) allows for concise descriptions of resources using blocks, arguments, and expressions.

$ terraform plan
An execution plan has been generated and is shown below.

Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # aws_ebs_volume.iac_in_action will be created
  + resource "aws_ebs_volume" "iac_in_action" {
        + arn               = (known after apply)
        + availability_zone = "us-east-1a"
        + encrypted         = (known after apply)
        + id                = (known after apply)
        + iops              = 1000
        + kms_key_id        = (known after apply)
        + size              = 100
        + snapshot_id       = (known after apply)
        + tags              = {
                + "Name" = "Terraform-managed EBS Volume for IaC in Action"
            }
            + type              = "io1"
    }

Plan: 1 to add, 0 to change, 0 to destroy.

$ terraform planAn execution plan has been generated and is shown below. Resource actions are indicated with the following symbols:  + create Terraform will perform the following actions:   # aws_ebs_volume.iac_in_action will be created  + resource "aws_ebs_volume" "iac_in_action" {        + arn               = (known after apply)        + availability_zone = "us-east-1a"        + encrypted         = (known after apply)        + id                = (known after apply)        + iops              = 1000        + kms_key_id        = (known after apply)        + size              = 100        + snapshot_id       = (known after apply)        + tags              = {                + "Name" = "Terraform-managed EBS Volume for IaC in Action"            }            + type              = "io1"    } Plan: 1 to add, 0 to change, 0 to destroy.

Plan

Run terraform plan to check whether the execution plan for a configuration matches your expectations before provisioning or changing infrastructure.

Apply

Apply

Apply changes to hundreds of cloud providers with terraform apply to reach the desired state of the configuration.

Features

Slide 1 of 7
  • Write declarative config files

    Define infrastructure as code to manage the full lifecycle — create new resources, manage existing ones, and destroy those no longer needed.

    variable "ami_id" {
  type        = string
  description = "AMI ID to use"
  default     = "ami-09d95fab7fff3776c"
}

variable "instance_type" {
  type        = string
  description = "Instance type to use"
  default     = "t3.micro"
}

variable "availability_zone" {
  type        = string
  description = "Availability Zone to use"
  default     = "us-east-1a"
}

    variable "ami_id" {  type        = string  description = "AMI ID to use"  default     = "ami-09d95fab7fff3776c"} variable "instance_type" {  type        = string  description = "Instance type to use"  default     = "t3.micro"} variable "availability_zone" {  type        = string  description = "Availability Zone to use"  default     = "us-east-1a"}

  • Define infrastructure as code to manage the full lifecycle — create new resources, manage existing ones, and destroy those no longer needed.

    Learn more
variable "ami_id" {
  type        = string
  description = "AMI ID to use"
  default     = "ami-09d95fab7fff3776c"
}

variable "instance_type" {
  type        = string
  description = "Instance type to use"
  default     = "t3.micro"
}

variable "availability_zone" {
  type        = string
  description = "Availability Zone to use"
  default     = "us-east-1a"
}

variable "ami_id" {  type        = string  description = "AMI ID to use"  default     = "ami-09d95fab7fff3776c"} variable "instance_type" {  type        = string  description = "Instance type to use"  default     = "t3.micro"} variable "availability_zone" {  type        = string  description = "Availability Zone to use"  default     = "us-east-1a"}

Why Terraform

  • Codify your application infrastructure

    Reduce human error and increase automation by provisioning infrastructure as code.

  • Manage infrastructure across clouds

    Provision infrastructure across 300+ public clouds and services using a single workflow.

  • Create reproducible infrastructure

    Provision consistent testing, staging, and production environments with the same configuration.

How Terraform works

How Terraform Works

Terraform allows infrastructure to be expressed as code in a simple, human readable language called HCL (HashiCorp Configuration Language). It reads configuration files and provides an execution plan of changes, which can be reviewed for safety and then applied and provisioned.

Extensible providers allow Terraform to manage a broad range of resources, including IaaS, PaaS, SaaS, and hardware services.

Are you using Terraform in production?

Share your success story and receive special Terraform swag.

A strong community

  • 450,000+ Commits
  • 4,000+ Modules
  • 1000+ Providers

Open source projects benefit from the scrutiny of a broad and diverse user base. Keeping the code available helps empower the community of users while also providing an easy mechanism for feedback, improvement, and customization.

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