gistfile1.txt

resource "aws_autoscaling_group" "hosting" {
  name = "hosting"
  availability_zones = [ "us-west-2a", "us-west-2b", "us-west-2c"]
  max_size = 9
  min_size = 3
  desired_capacity = 3

  health_check_type = "EC2"
  force_delete = true

  launch_configuration = "${aws_launch_configuration.hosting.name}"
  vpc_zone_identifier = ["${var.subnet_hosting-us-west-2a}","${var.subnet_hosting-us-west-2b}","${var.subnet_hosting-us-west-2c}"]

  # Name tag
  tag {
    key = "Name"
    value = "hosting"
    propagate_at_launch = true
  }

resource "aws_autoscaling_policy" "hosting" {
  name = "${var.env}-hosting"
  scaling_adjustment = 1
  adjustment_type = "ChangeInCapacity"
  cooldown = 300
  autoscaling_group_name = "${aws_autoscaling_group.hosting.name}"
}

resource "aws_cloudwatch_metric_alarm" "hosting" {
    alarm_name = "${var.env}-hosting-cpu"
    comparison_operator = "GreaterThanOrEqualToThreshold"
    evaluation_periods = "2"
    metric_name = "CPUUtilization"
    namespace = "AWS/EC2"
    period = "60"
    statistic = "Average"
    threshold = "60"
    alarm_description = "This metric monitor sites EC2 cpu utilization"
    alarm_actions = ["${aws_autoscaling_policy.hosting.arn}"]
    
}

resource "aws_sns_topic" "scaling_hosting" {
  name = "${var.env}-scaling-hosting"
  # Workaround until Terraform support Email protocol/confirmation
  provisioner "local-exec" {
      command = "aws --profile ${var.env} sns subscribe --topic-arn ${aws_sns_topic.scaling_hosting.arn} --protocol email --notification-endpoint ${var.env}-alerts@example.com"
    }
}