tutorial.yaml

AppLaunchConfig: # (2)
    Type: AWS::AutoScaling::LaunchConfiguration # (2)
    Properties:
      ImageId: ami-0389b2a3c4948b1a0
      InstanceType: t2.micro
      SecurityGroups:
        - !Ref InstanceSecurityGroup
      UserData:
        Fn::Base64:
          Fn::Sub: |
            #!/bin/bash -xe
            yum update -y
            yum install -y httpd
            systemctl start httpd
            systemctl enable httpd
            echo "Hello from $(hostname -f)" > /var/www/html/index.html

  AutoScalingGroup: # (3)
    Type: AWS::AutoScaling::AutoScalingGroup # (3)
    Properties:
      LaunchConfigurationName: !Ref AppLaunchConfig # (3)
      AvailabilityZones: # (3)
        - !Select [0, !GetAZs ]
        - !Select [1, !GetAZs ]
      DesiredCapacity: 3 # (3)
      MinSize: 3
      MaxSize: 3