Implementing AWS: Design, Build, and Manage your Infrastructure

How to do it...

1. Open up your text editor and create a new CloudFormation template. We're going to start by adding a few Parameters as follows:

      AWSTemplateFormatVersion: '2010-09-09'       Parameters:         AmiId:           Type: AWS::EC2::AMI::Id           Description: AMI ID to launch instances from         VPCID:           Type: AWS::EC2::VPC::Id           Description: VPC where load balancer and instance will launch         SubnetIDs:           Type: List<AWS::EC2::Subnet::Id>           Description: Subnets where load balancer and instance will launch             (pick at least 2)

2. Let's take a look at a security group we'll apply to a public load balancer:

      ExampleELBSecurityGroup:         Type: AWS::EC2::SecurityGroup         Properties:           GroupDescription: Security Group for example ELB           SecurityGroupIngress:             - IpProtocol: tcp