Project8template.yaml

AWSTemplateFormatVersion: "2010-09-09"

Description: This template creates a VPC with public and private subnets and an autoscaling group with a target tracking policy. NGINX Web Server and Stress Test tool are also installed on each EC2 instance at boot.

Parameters:
  VpcCidr:
    Default: 10.10.0.0/16
    Description: Please enter the IP range (CIDR notation) for this VPC
    Type: String

  Subnets:
    Type: 'List<AWS::EC2::Subnet::Id>'
    Description: The list of Subnets in your Virtual Private Cloud (VPC)
    ConstraintDescription:
      must be a list of at least two existing subnets associated with at least
      two different availability zones.

  CPUPolicyTargetValue:
    Default: 80
    Description: Please enter the target CPU utilization
    Type: String

  LaunchTemplateVersionNumber:
    Default: 1
    Type: String

  SSHLocation:
    AllowedPattern: '(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})'
    ConstraintDescription: must be a valid IP CIDR range of the form x.x.x.x/x.
    Default: 0.0.0.0/0
    Description: The IP address range that can be used to access the web server using SSH.
    MaxLength: '18'
    MinLength: '9'
    Type: String

Resources:
  VPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref VpcCidr
      EnableDnsHostnames: True
      EnableDnsSupport: True
      InstanceTenancy: default
      Tags:
        - Key: Name
          Value: Project8VPC

  InternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties:
      Tags:
        - Key: Name
          Value: Project8IGW

  InternetGatewayAttachment:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      InternetGatewayId: !Ref InternetGateway
      VpcId: !Ref VPC
      

#Create Route Table
  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      Tags:
        - Key: Name
          Value: PublicRouteTable
      VpcId: !Ref VPC

  PublicRoute:
    Type: AWS::EC2::Route
    Properties:
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref InternetGateway
      RouteTableId: !Ref PublicRouteTable

#Create Security Group
  InstanceSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Allow access on ports 80 and 22
      GroupName: MyWebServerSG
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 80
          ToPort: 80
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: 108.185.98.33/32

      Tags:
        - Key: Name
          Value: MyWebServerSG
      VpcId: vpc-0e8715e0609c5d988

#Create Launch Template
  LaunchTemplate:
    Type: 'AWS::EC2::LaunchTemplate'
    Properties:
      LaunchTemplateName: !Sub '${AWS::StackName}-launch-template-for-auto-scaling'
      LaunchTemplateData:
        NetworkInterfaces:
          - DeviceIndex: 0
            AssociatePublicIpAddress: true
            Groups:
              - !Ref InstanceSecurityGroup
            DeleteOnTermination: true
        Placement:
          Tenancy: default
        ImageId: ami-0022f774911c1d690
        InstanceType: t2.micro
        UserData:
          Fn::Base64:
            !Sub |
              #!/bin/bash
              yum update -y
              yum install nginx -y
              systemctl start nginx
              systemctl enable nginx
              amazon-linux-extras install epel -y
              yum install stress -y

#Create AutoScaling Group
  AutoScalingGroup:
    Type: AWS::AutoScaling::AutoScalingGroup
    Properties:
      LaunchTemplate:
        LaunchTemplateId: !Ref LaunchTemplate
        Version: !Ref LaunchTemplateVersionNumber
      MinSize: '2'
      MaxSize: '5'
      DesiredCapacity: '3'
      VPCZoneIdentifier: !Ref Subnets

#AutoScaling Group Tracking Policy
  myCPUPolicy:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AutoScalingGroupName: !Ref AutoScalingGroup
      PolicyType: TargetTrackingScaling
      TargetTrackingConfiguration:
        PredefinedMetricSpecification:
          PredefinedMetricType: ASGAverageCPUUtilization
        TargetValue: !Ref CPUPolicyTargetValue