template.yaml

AWSTemplateFormatVersion: 2010-09-09

Description: |
  The ec2 instance configuration

Parameters:
  NetworkStack:
    Type: String
    Description: This is our base layer of networking components eg. VPC, Subnets
    Default: TestUbuntuNet

Resources:
  WebServerInstance:
    # https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance.html#aws-properties-ec2-instance--examples
    Type: AWS::EC2::Instance
    Properties:
      ImageId: "ami-053b0d53c279acc90"
      InstanceType: "t2.micro"
      KeyName: "terraform-demo"
      NetworkInterfaces: 
        - AssociatePublicIpAddress: "true"
          DeviceIndex: "0"
          GroupSet: 
            - Fn::ImportValue: !Sub ${NetworkStack}SecurityGroupId
          SubnetId: 
            Fn::Select:
              - 0  # Index 0 to get the first subnet
              - Fn::Split:
                - ","
                - Fn::ImportValue: !Sub "${NetworkStack}PublicSubnetIds"
      UserData:
        Fn::Base64: |
          #!/bin/bash
          sudo apt update -y
          sudo apt install apache2 -y
          sudo systemctl start apache2
          sudo bash -c 'echo "Cloudformation first web server" > /var/www/html/index.html'
      Tags:
        - Key: Name
          Value: "test-ubuntu-ec2-instance"

Outputs:
  ServerPublicIP:
    Description: "Public IP of the EC2 instance"
    Value: !GetAtt WebServerInstance.PublicIp

  ServerPrivateIP:
    Description: "Private IP of the EC2 instance"
    Value: !GetAtt WebServerInstance.PrivateIp

  ServerInstanceID:
    Description: "Instance ID of the EC2 instance"
    Value: !Ref WebServerInstance