Terraform count:

• count is meta arugment to create multiple resources with single block

basic count

## variables

variable "vpc_name" {
    type = string
    default = "mynetwork"
    description = "name of the vpc"
    sensitive = true
}

variable "subnet_cidrs" {
    type = list(string)
    default = [ "10.2.1.0/24", "10.2.2.0/24", "10.2.3.0/24"]
}


variable "az-range" {
    type = list(string)
    default = [ "us-east-1a", "us-east-1b", "us-east-1c"]
}



################################ resources #########################
resource "aws_vpc" "qt-demo-vpc" {
  cidr_block = "10.2.0.0/16"

  tags = {
    Name = var.vpc_name
    env  = "dev"
  }
}

resource "aws_subnet" "mysubnets" {
  count = length(var.subnet_cidrs)
  vpc_id     = aws_vpc.qt-demo-vpc.id
  cidr_block = var.subnet_cidrs[count.index]
  availability_zone = var.az-range[count.index]
  tags = {
    Name = "app1"
  }
}

count with if conditions

Ex: create_instance is true create 1 ec2 instance

• changes added if conditions
• referance

Task

1. create vpc & 4 public subnets and 4 pravite subnets
   1. myvpc – name vpc 10.5.0.0/16
   2. public subnets – pub-sub1, pub-sub2, pub-sub3, pub-sub4
   3. pravite subnets – pvsubnet1, pvsubnet2, pvsubnet3, pvsubnet4
   4. create 2 route table pubroute & pvroute
   5. IGW
   6. NAT
   7. create route in pub route table attach IGW
   8. create route in pv route table attach NAT
   9. ass subnets pv and pub route tables

use count and create resources