autoscaling.yaml

AWSTemplateFormatVersion: "2010-09-09"

Description: EC2 for webserver

Parameters:
  Key:
    Description: KeyPair
    Type: AWS::EC2::KeyPair::KeyName
  
  VPC:
    Description: VPC
    Type: AWS::EC2::VPC::Id

  WebSG:
    Description: SG for Web Server
    Type: AWS::EC2::SecurityGroup::Id
  
  PublicSubnet1:
    Description: public 1
    Type: AWS::EC2::Subnet::Id
  PublicSubnet2:
    Description: public 2
    Type: AWS::EC2::Subnet::Id
  PrivateSubnet1:
    Description: private 1
    Type: AWS::EC2::Subnet::Id
  PrivateSubnet2:
    Description: private 2
    Type: AWS::EC2::Subnet::Id


Resources:
  LC:
    Type: AWS::AutoScaling::LaunchConfiguration
    Properties:
      ImageId: ami-017459178eade98f5
      InstanceType: t3.micro
      InstanceMonitoring: true
      KeyName: !Ref Key
      LaunchConfigurationName: webserverLC
      SecurityGroups:
        - !Ref WebSG

  ALB:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties:
      Name: webserverALB
      Type: application
      SecurityGroups:
        - !Ref WebSG
      Subnets:
        - !Ref PublicSubnet1
        - !Ref PublicSubnet2

  TargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      VpcId: !Ref VPC
      Name: webtest
      Port: 80
      Protocol: HTTP
      VpcId: !Ref VPC
      HealthCheckEnabled: true
      HealthCheckIntervalSeconds: 10
      HealthCheckPath: /
      HealthCheckProtocol: HTTP
      HealthCheckTimeoutSeconds: 5
      HealthyThresholdCount: 5
      UnhealthyThresholdCount: 2

  ALBListener:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties:
      DefaultActions:
        - Type: forward
          TargetGroupArn: !Ref TargetGroup   
      LoadBalancerArn: !Ref ALB
      Port: 80
      Protocol: HTTP

  ASG:
    Type: AWS::AutoScaling::AutoScalingGroup
    Properties:
      AutoScalingGroupName: webserverASG
      VPCZoneIdentifier:
        - !Ref PrivateSubnet1
        - !Ref PrivateSubnet2
      Cooldown: 10
      LaunchConfigurationName: !Ref LC
      MaxSize: 4
      MinSize: 2
      DesiredCapacity: 2
      TargetGroupARNs:
        - !Ref TargetGroup
      Tags:
        - Key: Name
          Value: web-asg
          PropagateAtLaunch: true

  ASGPolicy:
    Type: AWS::AutoScaling::ScalingPolicy
    Properties:
      AutoScalingGroupName: !Ref ASG
      PolicyType: TargetTrackingScaling
      TargetTrackingConfiguration:
        PredefinedMetricSpecification:
          PredefinedMetricType: ASGAverageCPUUtilization
        TargetValue: 45