main.tf

provider "aws" {
  region = "us-west-1"
}

resource "aws_instance" "web" {
  instance_type = "t2.micro"
  ami = "ami-09b4b74c"
}

resource "aws_autoscaling_group" "my_asg" {
  availability_zones        = ["us-west-1a"]
  name                      = "my_asg"
  max_size                  = 5
  min_size                  = 1
  health_check_grace_period = 300
  health_check_type         = "ELB"
  desired_capacity          = 4
  force_delete              = true
  launch_configuration      = "my_web_config"
}

resource "aws_launch_configuration" "my_web_config" {
  name = "my_web_config"
  image_id = "ami-09b4b74c"
  instance_type = "t2.micro"
}