added aws auto scaling example

Author: easyawslearn

terraform-aws-autoscaling/main.tf

@@ -0,0 +1,72 @@
+provider "aws" {
+  region     = var.region
+}
+
+resource "aws_launch_configuration" "launch_config" {
+  name          = "web_config"
+  image_id      = lookup(var.ami_id, var.region)
+  instance_type = "t2.micro"
+  key_name      = var.key_name
+  security_groups = [ var.security_grpup_id]
+}
+
+resource "aws_autoscaling_group" "example_autoscaling" {
+  name                      = "autoscaling-terraform-test"
+  max_size                  = 2
+  min_size                  = 1
+  health_check_grace_period = 300
+  health_check_type         = "EC2"
+  desired_capacity          = 1
+  force_delete              = true
+  launch_configuration      = aws_launch_configuration.launch_config.name
+  availability_zones        = ["us-east-1a","us-east-1b"]
+  # vpc_zone_identifier       = [aws_subnet.example1.id, aws_subnet.example2.id]
+
+}
+
+resource "aws_autoscaling_policy" "asp" {
+  name                   = "asp-terraform-test"
+  scaling_adjustment     = 1
+  adjustment_type        = "ChangeInCapacity"
+  cooldown               = 300
+  policy_type            = "SimpleScaling"
+  autoscaling_group_name = aws_autoscaling_group.example_autoscaling.name
+}
+
+resource "aws_cloudwatch_metric_alarm" "aws_cloudwatch_metric_alarm" {
+  alarm_name                = "terraform-test-cloudwatch"
+  comparison_operator       = "GreaterThanOrEqualToThreshold"
+  evaluation_periods        = "2"
+  metric_name               = "CPUUtilization"
+  namespace                 = "AWS/EC2"
+  period                    = "120"
+  statistic                 = "Average"
+  threshold                 = "30"
+  alarm_description         = "This metric monitors ec2 cpu utilization"
+  
+   dimensions = {
+    AutoScalingGroupName = aws_autoscaling_group.example_autoscaling.name
+  }
+  
+    actions_enabled     = true
+    alarm_actions     = [aws_autoscaling_policy.asp.arn]
+
+}
+
+resource "aws_sns_topic" "user_updates" {
+  name = "user-updates-topic"
+  display_name = "example auto scaling"
+}
+
+resource "aws_autoscaling_notification" "example_notifications" {
+  group_names = [aws_autoscaling_group.example_autoscaling.name]
+
+  notifications = [
+    "autoscaling:EC2_INSTANCE_LAUNCH",
+    "autoscaling:EC2_INSTANCE_TERMINATE",
+    "autoscaling:EC2_INSTANCE_LAUNCH_ERROR",
+    "autoscaling:EC2_INSTANCE_TERMINATE_ERROR",
+  ]
+
+  topic_arn = aws_sns_topic.user_updates.arn
+}

terraform-aws-autoscaling/variables.tf

@@ -0,0 +1,37 @@
+variable "region" {
+  default = "us-east-1"
+}
+
+variable "ami_id" {
+  type = "map"
+  default = {
+    us-east-1    = "ami-04d29b6f966df1537"
+    eu-west-2    = "ami-132b3c7efe6sdfdsfd"
+    eu-central-1 = "ami-9787h5h6nsn75gd33"
+  }
+}
+
+variable "key_name" {
+  type    = "string"
+  default = "ec2-demo"
+}
+
+variable "instance_type" {
+  type    = "string"
+  default = "t2.micro"
+}
+
+variable "subnets" {
+  type    = list(string)
+  default = ["subnet-59b98303","subnet-0d7cb232"]
+}
+
+variable "azs" {
+  type    = list(string)
+  default = ["us-east-1a","us-east-1b"]
+}
+
+variable "security_grpup_id" {
+  type    = "string"
+  default = "sg-53623a20"
+}

terraform-aws-iam/iam_role_with_instance/variables.tf

@@ -16,6 +16,7 @@ variable "key_name" {
   default = "ec2-demo"
 }
 
+
 variable "instance_type" {
   type    = "string"
   default = "t2.micro"