tutorial.yaml

FirstInstance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: ami-0389b2a3c4948b1a0
      InstanceType: t2.micro
      SecurityGroups:
        - !Ref InstanceSecurityGroup # (1)
      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

  InstanceSecurityGroup: # (2)
    Type: AWS::EC2::SecurityGroup # (3)
    Properties:
      GroupDescription: Letting HTTP into our instance
      SecurityGroupIngress:
        - FromPort: 80 # (4)
          ToPort: 80
          CidrIp: 0.0.0.0/0 # (5)
          IpProtocol: tcp