demo-15

demo-15/autoscaling.tf

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+resource "aws_launch_configuration" "example-launchconfig" {
+  name_prefix          = "example-launchconfig"
+  image_id             = "${lookup(var.AMIS, var.AWS_REGION)}"
+  instance_type        = "t2.micro"
+  key_name             = "${aws_key_pair.mykeypair.key_name}"
+  security_groups      = ["${aws_security_group.allow-ssh.id}"]
+}
+
+resource "aws_autoscaling_group" "example-autoscaling" {
+  name                 = "example-autoscaling"
+  vpc_zone_identifier  = ["${aws_subnet.main-public-1.id}", "${aws_subnet.main-public-2.id}"]
+  launch_configuration = "${aws_launch_configuration.example-launchconfig.name}"
+  min_size             = 1
+  max_size             = 2
+  health_check_grace_period = 300
+  health_check_type = "EC2"
+  force_delete = true
+
+  tag {
+      key = "Name"
+      value = "ec2-container"
+      propagate_at_launch = true
+  }
+}
+

demo-15/autoscalingpolicy.tf

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+# scale up alarm
+
+resource "aws_autoscaling_policy" "example-cpu-policy" {
+  name                   = "example-cpu-policy"
+  autoscaling_group_name = "${aws_autoscaling_group.example-autoscaling.name}"
+  adjustment_type        = "ChangeInCapacity"
+  scaling_adjustment     = "1"
+  cooldown               = "300"
+  policy_type            = "SimpleScaling"
+}
+
+resource "aws_sns_topic" "example-cpu-sns" {
+  name         = "sg-cpu-sns"
+  display_name = "example ASG SNS topic"
+}
+
+resource "aws_autoscaling_notification" "example-notify" {
+  group_names = ["${aws_autoscaling_group.example-autoscaling.name}"]
+  topic_arn     = "${aws_sns_topic.example-cpu-sns.arn}"
+  notifications  = [
+    "autoscaling:EC2_INSTANCE_LAUNCH", 
+    "autoscaling:EC2_INSTANCE_TERMINATE",
+    "autoscaling:EC2_INSTANCE_LAUNCH_ERROR"
+  ]
+}
+
+resource "aws_cloudwatch_metric_alarm" "example-cpu-alarm" {
+  alarm_name          = "example-cpu-alarm"
+  alarm_description   = "example-cpu-alarm"
+  comparison_operator = "GreaterThanOrEqualToThreshold"
+  evaluation_periods  = "2"
+  metric_name         = "CPUUtilization"
+  namespace           = "AWS/EC2"
+  period              = "120"
+  statistic           = "Average"
+  threshold           = "30"
+
+  dimensions = {
+    "AutoScalingGroupName" = "${aws_autoscaling_group.example-autoscaling.name}"
+  }
+
+  actions_enabled = true
+  alarm_actions   = ["${aws_autoscaling_policy.example-cpu-policy.arn}"]
+}
+
+# scale down alarm
+resource "aws_autoscaling_policy" "example-cpu-policy-scaledown" {
+  name                   = "example-cpu-policy-scaledown"
+  autoscaling_group_name = "${aws_autoscaling_group.example-autoscaling.name}"
+  adjustment_type        = "ChangeInCapacity"
+  scaling_adjustment     = "-1"
+  cooldown               = "300"
+  policy_type            = "SimpleScaling"
+}
+
+resource "aws_sns_topic" "example-cpu-sns-scaledown" {
+  name         = "sg-cpu-sns-scaledown"
+  display_name = "example ASG SNS topic scaledown"
+}
+
+resource "aws_autoscaling_notification" "example-notify-scaledown" {
+  group_names = ["${aws_autoscaling_group.example-autoscaling.name}"]
+  topic_arn     = "${aws_sns_topic.example-cpu-sns-scaledown.arn}"
+  notifications  = [
+    "autoscaling:EC2_INSTANCE_LAUNCH", 
+    "autoscaling:EC2_INSTANCE_TERMINATE",
+    "autoscaling:EC2_INSTANCE_LAUNCH_ERROR"
+  ]
+}
+
+resource "aws_cloudwatch_metric_alarm" "example-cpu-alarm-scaledown" {
+  alarm_name          = "example-cpu-alarm-scaledown"
+  alarm_description   = "example-cpu-alarm-scaledown"
+  comparison_operator = "LessThanOrEqualToThreshold"
+  evaluation_periods  = "2"
+  metric_name         = "CPUUtilization"
+  namespace           = "AWS/EC2"
+  period              = "120"
+  statistic           = "Average"
+  threshold           = "5"
+
+  dimensions = {
+    "AutoScalingGroupName" = "${aws_autoscaling_group.example-autoscaling.name}"
+  }
+
+  actions_enabled = true
+  alarm_actions   = ["${aws_autoscaling_policy.example-cpu-policy-scaledown.arn}"]
+}

demo-15/key.tf

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+resource "aws_key_pair" "mykeypair" {
+  key_name = "mykeypair"
+  public_key = "${file("${var.PATH_TO_PUBLIC_KEY}")}"
+  lifecycle {
+    ignore_changes = ["public_key"]
+  }
+}

demo-15/provider.tf

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+provider "aws" { 
+    region = "${var.AWS_REGION}"
+}

demo-15/securitygroup.tf

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+resource "aws_security_group" "allow-ssh" {
+  vpc_id = "${aws_vpc.main.id}"
+  name = "allow-ssh"
+  description = "security group that allows ssh and all egress traffic"
+  egress {
+      from_port = 0
+      to_port = 0
+      protocol = "-1"
+      cidr_blocks = ["0.0.0.0/0"]
+  }
+
+  ingress {
+      from_port = 22
+      to_port = 22
+      protocol = "tcp"
+      cidr_blocks = ["0.0.0.0/0"]
+  } 
+tags {
+    Name = "allow-ssh"
+  }
+}

demo-15/vars.tf

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+variable "AWS_REGION" {
+  default = "eu-west-1"
+}
+variable "PATH_TO_PRIVATE_KEY" {
+  default = "mykey"
+}
+variable "PATH_TO_PUBLIC_KEY" {
+  default = "mykey.pub"
+}
+variable "AMIS" {
+  type = "map"
+  default = {
+    us-east-1 = "ami-13be557e"
+    us-west-2 = "ami-06b94666"
+    eu-west-1 = "ami-844e0bf7"
+  }
+}

demo-15/vpc.tf

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+# Internet VPC
+resource "aws_vpc" "main" {
+    cidr_block = "10.0.0.0/16"
+    instance_tenancy = "default"
+    enable_dns_support = "true"
+    enable_dns_hostnames = "true"
+    enable_classiclink = "false"
+    tags {
+        Name = "main"
+    }
+}
+
+
+# Subnets
+resource "aws_subnet" "main-public-1" {
+    vpc_id = "${aws_vpc.main.id}"
+    cidr_block = "10.0.1.0/24"
+    map_public_ip_on_launch = "true"
+    availability_zone = "eu-west-1a"
+
+    tags {
+        Name = "main-public-1"
+    }
+}
+resource "aws_subnet" "main-public-2" {
+    vpc_id = "${aws_vpc.main.id}"
+    cidr_block = "10.0.2.0/24"
+    map_public_ip_on_launch = "true"
+    availability_zone = "eu-west-1b"
+
+    tags {
+        Name = "main-public-2"
+    }
+}
+resource "aws_subnet" "main-public-3" {
+    vpc_id = "${aws_vpc.main.id}"
+    cidr_block = "10.0.3.0/24"
+    map_public_ip_on_launch = "true"
+    availability_zone = "eu-west-1c"
+
+    tags {
+        Name = "main-public-3"
+    }
+}
+resource "aws_subnet" "main-private-1" {
+    vpc_id = "${aws_vpc.main.id}"
+    cidr_block = "10.0.4.0/24"
+    map_public_ip_on_launch = "false"
+    availability_zone = "eu-west-1a"
+
+    tags {
+        Name = "main-private-1"
+    }
+}
+resource "aws_subnet" "main-private-2" {
+    vpc_id = "${aws_vpc.main.id}"
+    cidr_block = "10.0.5.0/24"
+    map_public_ip_on_launch = "false"
+    availability_zone = "eu-west-1b"
+
+    tags {
+        Name = "main-private-2"
+    }
+}
+resource "aws_subnet" "main-private-3" {
+    vpc_id = "${aws_vpc.main.id}"
+    cidr_block = "10.0.6.0/24"
+    map_public_ip_on_launch = "false"
+    availability_zone = "eu-west-1c"
+
+    tags {
+        Name = "main-private-3"
+    }
+}
+
+# Internet GW
+resource "aws_internet_gateway" "main-gw" {
+    vpc_id = "${aws_vpc.main.id}"
+
+    tags {
+        Name = "main"
+    }
+}
+
+# route tables
+resource "aws_route_table" "main-public" {
+    vpc_id = "${aws_vpc.main.id}"
+    route {
+        cidr_block = "0.0.0.0/0"
+        gateway_id = "${aws_internet_gateway.main-gw.id}"
+    }
+
+    tags {
+        Name = "main-public-1"
+    }
+}
+
+# route associations public
+resource "aws_route_table_association" "main-public-1-a" {
+    subnet_id = "${aws_subnet.main-public-1.id}"
+    route_table_id = "${aws_route_table.main-public.id}"
+}
+resource "aws_route_table_association" "main-public-2-a" {
+    subnet_id = "${aws_subnet.main-public-2.id}"
+    route_table_id = "${aws_route_table.main-public.id}"
+}
+resource "aws_route_table_association" "main-public-3-a" {
+    subnet_id = "${aws_subnet.main-public-3.id}"
+    route_table_id = "${aws_route_table.main-public.id}"
+}