---
AWSTemplateFormatVersion: "2010-09-09"
Description: >
  AWS EC2 Good Template
Parameters:
  myEnvironment:
    Type: String
    AllowedValues:
      - prod
      - dev
Conditions:
  isProd:
    "Fn::Equals":
    - !Ref myEnvironment
    - "prod"
Resources:
  MyLaunchConfig:
    Type: AWS::AutoScaling::LaunchConfiguration
    Properties:
      ImageId: "ami-2f726546"
      InstanceType: t2.micro
  myLoadBalancer:
    Type: "AWS::AutoScaling::AutoScalingGroup"
    Properties:
      AvailabilityZones:
        # Hardcoded AZ's
        - !If [isProd, "eu-west-1a", !Ref "AWS::NoValue"]
        - "eu-west-1b"
      MaxSize: 3
      MinSize: 1
      LaunchConfigurationName: !Ref MyLaunchConfig
  mySubnet2-2:
    Type: AWS::EC2::Subnet
    Properties:
      # Hardcoded AZ
      AvailabilityZone: us-east-1a
      CidrBlock: "172.31.0.0/16"
      VpcId: vpc-1234567