# variables.tf
variable "aws_region" {
  type = string
  default = "us-east-1"
}
# main.tf
resource "aws_instance" "example" {
  ami = "ami-01234567890abcdef0"
  instance_type = "t2.micro"
  key_name = "my-key-pair"
  region = var.aws_region
}Code language: PHP (php)

variable "instance_count" {
  type = number
  default = 1
}

variable "instance_name" {
  type = string
  default = "Rajesh"
}

resource "aws_instance" "example-number" {
  count = var.instance_count
  ami           = "ami-0f5ee92e2d63afc18"
  instance_type = "t2.micro"
  
  tags = {
    Name = var.instance_name
  }
}

variable "security_groups" {
  type = list(string)
  default = ["sg-0718505e2e0301294"]
}

resource "aws_instance" "example-list" {
  ami           = "ami-0f5ee92e2d63afc18"
  instance_type = "t2.micro"
  vpc_security_group_ids = var.security_groups
}

variable "instance_tags" {
  type = map(string)
  default = {
    Name = "my-instance4mMap-Rajesh"
  }
}

resource "aws_instance" "example-map" {
  ami           = "ami-0f5ee92e2d63afc18"
  instance_type = "t2.micro"
  tags = var.instance_tags
}

variable "create_vm" {
  description = "If set to true, it will create vm"
   type   = bool
}

resource "aws_instance" "example-bool" {
  count   = var.create_vm ? 1 : 0
  ami           = "ami-0f5ee92e2d63afc18"
  instance_type = "t2.micro"
  tags = var.instance_tags
}Code language: PHP (php)