Template_CloudFormation

AWSTemplateFormatVersion_LUIT07.yml

AWSTemplateFormatVersion: 2010-09-09
Resources:
  # Creating the VPC
  VPC:
    Type: 'AWS::EC2::VPC'
    Properties:
      CidrBlock: 10.10.0.0/16
      EnableDnsSupport: true
      EnableDnsHostnames: true
      Tags:
        - Key: Name
          Value: !Join 
            - ''
            - - !Ref 'AWS::StackName'
              - '-VPC'
    
  # Creating an internetGateway
  InternetGateway:
    Type: 'AWS::EC2::InternetGateway'
    DependsOn: VPC

  # InternetGatewayAttachment to VPC
  InternetGatewayAttachment:
    Type: 'AWS::EC2::VPCGatewayAttachment'
    Properties:
      VpcId: !Ref VPC
      InternetGatewayId: !Ref InternetGateway
    
  # Create Public Subnet One
  PublicSubnet1:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref VPC
      AvailabilityZone: !Select [0, !GetAZs '']
      CidrBlock: 10.10.0.0/17
      MapPublicIpOnLaunch: true
      
  # Create Public Subnet Two
  PublicSubnet2:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref VPC
      AvailabilityZone: !Select [0, !GetAZs '']
      CidrBlock: 10.10.128.0/17
      MapPublicIpOnLaunch: true 

  # Create Route Table
  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref VPC

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

  # Associate Public Subnet One
  PublicSubnet1RouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref PublicRouteTable
      SubnetId: !Ref PublicSubnet1

  # Associate Public Subnet Two
  PublicSubnet2RouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      RouteTableId: !Ref PublicRouteTable
      SubnetId: !Ref PublicSubnet2

  # Create Security Group
  InstanceSecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupName: SecurityGroup-07
      GroupDescription: Open HTTP (port 80) and SSH (port 22)
      VpcId: !Ref VPC
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 80
          ToPort: 80
          CidrIp: 0.0.0.0/0
        - IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: 0.0.0.0/0
  
  # Create Launch Template
  LaunchTemplate:
    Type: 'AWS::EC2::LaunchTemplate'
    Properties:
      LaunchTemplateName: !Sub '${AWS::StackName}-launchTemplate4ASG'
      LaunchTemplateData:
        NetworkInterfaces:
          - DeviceIndex: 0
            AssociatePublicIpAddress: true
            DeleteOnTermination: true
            Groups:
              - !Ref InstanceSecurityGroup
        ImageId: ami-0022f774911c1d690
        InstanceType: t2.micro
        UserData:
          Fn::Base64: !Sub |
            #!/bin/bash
            yum update -y
            yum install httpd -y
            systemctl start httpd
            systemctl enable httpd
            amazon-linux-extras install epel -y
            yum install stress -y
        #SecurityGroupIds: 
        #  - !Ref InstanceSecurityGroup
    
  # Create AutoScaling Group
  AutoScalingGroup:
    Type: 'AWS::AutoScaling::AutoScalingGroup'
    Properties:
      LaunchTemplate:
        LaunchTemplateId: !Ref LaunchTemplate
        Version: !GetAtt LaunchTemplate.LatestVersionNumber
      MaxSize: '5'
      MinSize: '2'
      DesiredCapacity: '2'
      VPCZoneIdentifier: 
        - !Ref PublicSubnet1
        - !Ref PublicSubnet2
      MetricsCollection:
        - Granularity: 1Minute
  
  # Create a Scaling Policy
  ScalingPolicy07:
    Type: 'AWS::AutoScaling::ScalingPolicy'
    Properties:
      AdjustmentType: ChangeInCapacity
      AutoScalingGroupName: !Ref AutoScalingGroup
      ScalingAdjustment: '1'
   
  # CPU Threshold Alarm 50%
  CloudWatchAlarm:
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      EvaluationPeriods: '1'
      Statistic: Average
      Threshold: '50'
      AlarmDescription: Alarm if CPU higher than 50%
      Period: '60'
      AlarmActions:
        - !Ref ScalingPolicy07
      Namespace: AWS/EC2
      Dimensions:
        - Name: AutoScalingGroupName
          Value:
            Ref: AutoScalingGroup
      ComparisonOperator: GreaterThanThreshold
      MetricName: CPUUtilization