conditions.yaml

AWSTemplateFormatVersion: "2010-09-09"
Description: "Create EC2 instance"

Parameters: 
  Environment:
    Type: String
    AllowedValues:
      - dev
      - prod
      - qa

Mappings:
  EnvMap: #logical id/name
    dev:
      instanceType: "t2.large"
      name: "dev"

    qa:
      instanceType: "t2.medium"
      name: "qa"

    prod:
      instanceType: "t2.xlarge"
      name: "prod"

Conditions: 
  CreateProdResources: !Equals [ !Ref Environment, prod ]

Resources: 
  Instance: #logical id/name
    Type: AWS::EC2::Instance
    Properties: 
      InstanceType: !FindInMap [EnvMap, !Ref Environment, instanceType]
      ImageId: ami-0dba2cb6798deb6d8
      Tags: 
        - Key: "Name"
          Value: !FindInMap [EnvMap, !Ref Environment, name]

  MountPoint: 
    Type: AWS::EC2::VolumeAttachment
    Condition: CreateProdResources
    Properties: 
      InstanceId: 
        !Ref Instance
      VolumeId: 
        !Ref NewVolume
      Device: /dev/sdh

  NewVolume: 
    Type: AWS::EC2::Volume
    Condition: CreateProdResources
    Properties: 
      Size: 100
      AvailabilityZone: 
        !GetAtt Instance.AvailabilityZone

Outputs:
    InstanceName:
        Value: !Ref Instance