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@ohtsuka-shota(大塚 翔太)in株式会社クラスアクト

VPC Peering環境をCFnのyamlで管理する

Posted at

個人的な備忘録です。
VPCピアリングとか、TransitGatewayとかってCFnで管理しようとすると急に難しくなる気がするのは私だけでしょうか。。。
その苦手意識を少しでも払しょくするためのお勉強です。

※これらのyamlはオハイオリージョンでデプロイしています。
　リージョンが別でも問題は無いと思いますが確認はしていません。

VPC系のデプロイ

stg-env.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'VPC, Subnet, and Internet Gateway CloudFormation Template'

Parameters:
  Environment:
    Type: String
    Default: 'stg'
    Description: Environment prefix for resource names
  
  VpcCidr:
    Type: String
    Default: '10.0.0.0/16'
    Description: CIDR block for VPC
  
  PublicSubnetCidr:
    Type: String
    Default: '10.0.1.0/24'
    Description: CIDR block for Public Subnet

Resources:
  # VPC
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref VpcCidr
      EnableDnsHostnames: true
      EnableDnsSupport: true
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-vpc'

  # Internet Gateway
  MyInternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties:
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-igw'

  # IGWをVPCにアタッチ
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref MyVPC
      InternetGatewayId: !Ref MyInternetGateway

  # パブリックサブネット
  PublicSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: !Ref PublicSubnetCidr
      AvailabilityZone: !Select [0, !GetAZs '']
      MapPublicIpOnLaunch: true
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-public-subnet'

  # ルートテーブル
  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref MyVPC
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-public-rtb'

  # インターネットへのルート
  PublicRoute:
    Type: AWS::EC2::Route
    DependsOn: AttachGateway
    Properties:
      RouteTableId: !Ref PublicRouteTable
      DestinationCidrBlock: '0.0.0.0/0'
      GatewayId: !Ref MyInternetGateway

  # サブネットとルートテーブルの関連付け
  SubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet
      RouteTableId: !Ref PublicRouteTable

Outputs:
  VPCId:
    Description: VPC ID
    Value: !Ref MyVPC
    Export:
      Name: !Sub '${Environment}-VPC-ID'

  PublicSubnetId:
    Description: Public Subnet ID
    Value: !Ref PublicSubnet
    Export:
      Name: !Sub '${Environment}-PublicSubnet-ID'

  InternetGatewayId:
    Description: Internet Gateway ID
    Value: !Ref MyInternetGateway
    Export:
      Name: !Sub '${Environment}-IGW-ID'

  PublicRouteTableId:
    Description: Public Route Table ID
    Value: !Ref PublicRouteTable
    Export:
      Name: !Sub '${Environment}-public-rtb-id'

dev-env.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'VPC, Subnet, and Internet Gateway CloudFormation Template for Dev Environment'

Parameters:
  Environment:
    Type: String
    Default: 'dev'
    Description: Environment prefix for resource names
  
  VpcCidr:
    Type: String
    Default: '172.16.0.0/16'
    Description: CIDR block for VPC
  
  PublicSubnetCidr:
    Type: String
    Default: '172.16.1.0/24'
    Description: CIDR block for Public Subnet

Resources:
  # VPC
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref VpcCidr
      EnableDnsHostnames: true
      EnableDnsSupport: true
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-vpc'

  # Internet Gateway
  MyInternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties:
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-igw'

  # IGWをVPCにアタッチ
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref MyVPC
      InternetGatewayId: !Ref MyInternetGateway

  # パブリックサブネット
  PublicSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: !Ref PublicSubnetCidr
      AvailabilityZone: !Select [0, !GetAZs '']
      MapPublicIpOnLaunch: true
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-public-subnet'

  # ルートテーブル
  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref MyVPC
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-public-rtb'

  # インターネットへのルート
  PublicRoute:
    Type: AWS::EC2::Route
    DependsOn: AttachGateway
    Properties:
      RouteTableId: !Ref PublicRouteTable
      DestinationCidrBlock: '0.0.0.0/0'
      GatewayId: !Ref MyInternetGateway

  # サブネットとルートテーブルの関連付け
  SubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet
      RouteTableId: !Ref PublicRouteTable

Outputs:
  VPCId:
    Description: VPC ID
    Value: !Ref MyVPC
    Export:
      Name: !Sub '${Environment}-VPC-ID'

  PublicSubnetId:
    Description: Public Subnet ID
    Value: !Ref PublicSubnet
    Export:
      Name: !Sub '${Environment}-PublicSubnet-ID'

  InternetGatewayId:
    Description: Internet Gateway ID
    Value: !Ref MyInternetGateway
    Export:
      Name: !Sub '${Environment}-IGW-ID'

  PublicRouteTableId:
    Description: Public Route Table ID
    Value: !Ref PublicRouteTable
    Export:
      Name: !Sub '${Environment}-public-rtb-id'

prd-env.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'VPC, Subnet, and Internet Gateway CloudFormation Template for Production Environment'

Parameters:
  Environment:
    Type: String
    Default: 'prd'
    Description: Environment prefix for resource names
  
  VpcCidr:
    Type: String
    Default: '192.168.0.0/16'
    Description: CIDR block for VPC
  
  PublicSubnetCidr:
    Type: String
    Default: '192.168.1.0/24'
    Description: CIDR block for Public Subnet

Resources:
  # VPC
  MyVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: !Ref VpcCidr
      EnableDnsHostnames: true
      EnableDnsSupport: true
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-vpc'

  # Internet Gateway
  MyInternetGateway:
    Type: AWS::EC2::InternetGateway
    Properties:
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-igw'

  # IGWをVPCにアタッチ
  AttachGateway:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref MyVPC
      InternetGatewayId: !Ref MyInternetGateway

  # パブリックサブネット
  PublicSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref MyVPC
      CidrBlock: !Ref PublicSubnetCidr
      AvailabilityZone: !Select [0, !GetAZs '']
      MapPublicIpOnLaunch: true
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-public-subnet'

  # ルートテーブル
  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref MyVPC
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-public-rtb'

  # インターネットへのルート
  PublicRoute:
    Type: AWS::EC2::Route
    DependsOn: AttachGateway
    Properties:
      RouteTableId: !Ref PublicRouteTable
      DestinationCidrBlock: '0.0.0.0/0'
      GatewayId: !Ref MyInternetGateway

  # サブネットとルートテーブルの関連付け
  SubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet
      RouteTableId: !Ref PublicRouteTable

Outputs:
  VPCId:
    Description: VPC ID
    Value: !Ref MyVPC
    Export:
      Name: !Sub '${Environment}-VPC-ID'

  PublicSubnetId:
    Description: Public Subnet ID
    Value: !Ref PublicSubnet
    Export:
      Name: !Sub '${Environment}-PublicSubnet-ID'

  InternetGatewayId:
    Description: Internet Gateway ID
    Value: !Ref MyInternetGateway
    Export:
      Name: !Sub '${Environment}-IGW-ID'

  PublicRouteTableId:
    Description: Public Route Table ID
    Value: !Ref PublicRouteTable
    Export:
      Name: !Sub '${Environment}-public-rtb-id'

vpc-peering.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'VPC Peering Configuration for Dev, Stg, and Prd Environments'

Parameters:
  DevVpcId:
    Type: String
    Description: Dev VPC ID
    Default: 'vpc-xxxxxxxxx'
  
  StgVpcId:
    Type: String
    Description: Stg VPC ID
    Default: 'vpc-yyyyyyyyy'
  
  PrdVpcId:
    Type: String
    Description: Prd VPC ID
    Default: 'vpc-zzzzzzzzz'

Resources:
  # Dev <-> Stg VPC Peering
  DevStgPeeringConnection:
    Type: AWS::EC2::VPCPeeringConnection
    Properties:
      VpcId: !Ref DevVpcId
      PeerVpcId: !Ref StgVpcId
      Tags:
        - Key: Name
          Value: dev-stg-peering

  # Dev <-> Prd VPC Peering
  DevPrdPeeringConnection:
    Type: AWS::EC2::VPCPeeringConnection
    Properties:
      VpcId: !Ref DevVpcId
      PeerVpcId: !Ref PrdVpcId
      Tags:
        - Key: Name
          Value: dev-prd-peering

  # Stg <-> Prd VPC Peering
  StgPrdPeeringConnection:
    Type: AWS::EC2::VPCPeeringConnection
    Properties:
      VpcId: !Ref StgVpcId
      PeerVpcId: !Ref PrdVpcId
      Tags:
        - Key: Name
          Value: stg-prd-peering

  # Dev Route Table - Route to Stg
  DevToStgRoute:
    Type: AWS::EC2::Route
    DependsOn: DevStgPeeringConnection
    Properties:
      RouteTableId: !ImportValue dev-public-rtb-id
      DestinationCidrBlock: '10.0.0.0/16'
      VpcPeeringConnectionId: !Ref DevStgPeeringConnection

  # Dev Route Table - Route to Prd
  DevToPrdRoute:
    Type: AWS::EC2::Route
    DependsOn: DevPrdPeeringConnection
    Properties:
      RouteTableId: !ImportValue dev-public-rtb-id
      DestinationCidrBlock: '192.168.0.0/16'
      VpcPeeringConnectionId: !Ref DevPrdPeeringConnection

  # Stg Route Table - Route to Dev
  StgToDevRoute:
    Type: AWS::EC2::Route
    DependsOn: DevStgPeeringConnection
    Properties:
      RouteTableId: !ImportValue stg-public-rtb-id
      DestinationCidrBlock: '172.16.0.0/16'
      VpcPeeringConnectionId: !Ref DevStgPeeringConnection

  # Stg Route Table - Route to Prd
  StgToPrdRoute:
    Type: AWS::EC2::Route
    DependsOn: StgPrdPeeringConnection
    Properties:
      RouteTableId: !ImportValue stg-public-rtb-id
      DestinationCidrBlock: '192.168.0.0/16'
      VpcPeeringConnectionId: !Ref StgPrdPeeringConnection

  # Prd Route Table - Route to Dev
  PrdToDevRoute:
    Type: AWS::EC2::Route
    DependsOn: DevPrdPeeringConnection
    Properties:
      RouteTableId: !ImportValue prd-public-rtb-id
      DestinationCidrBlock: '172.16.0.0/16'
      VpcPeeringConnectionId: !Ref DevPrdPeeringConnection

  # Prd Route Table - Route to Stg
  PrdToStgRoute:
    Type: AWS::EC2::Route
    DependsOn: StgPrdPeeringConnection
    Properties:
      RouteTableId: !ImportValue prd-public-rtb-id
      DestinationCidrBlock: '10.0.0.0/16'
      VpcPeeringConnectionId: !Ref StgPrdPeeringConnection

Outputs:
  DevStgPeeringConnectionId:
    Description: Dev-Stg VPC Peering Connection ID
    Value: !Ref DevStgPeeringConnection
    Export:
      Name: dev-stg-peering-id

  DevPrdPeeringConnectionId:
    Description: Dev-Prd VPC Peering Connection ID
    Value: !Ref DevPrdPeeringConnection
    Export:
      Name: dev-prd-peering-id

  StgPrdPeeringConnectionId:
    Description: Stg-Prd VPC Peering Connection ID
    Value: !Ref StgPrdPeeringConnection
    Export:
      Name: stg-prd-peering-id

sgのデプロイ

stg-sg.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'Security Group for STG Environment EC2 instances'

Parameters:
  Environment:
    Type: String
    Default: 'stg'
    Description: Environment prefix for resource names
  
  VPCId:
    Type: String
    Description: VPC ID where the security group will be created

Resources:
  # EC2用セキュリティグループ（全ての通信を許可）
  EC2SecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupName: !Sub '${Environment}-ec2-sg'
      GroupDescription: !Sub 'Security group for ${Environment} EC2 instances - Allow all traffic'
      VpcId: !Ref VPCId
      SecurityGroupIngress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
          Description: Allow all inbound traffic
      SecurityGroupEgress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
          Description: Allow all outbound traffic
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-ec2-sg'
        - Key: Environment
          Value: !Ref Environment

Outputs:
  EC2SecurityGroupId:
    Description: EC2 Security Group ID
    Value: !Ref EC2SecurityGroup
    Export:
      Name: !Sub '${Environment}-EC2-SG-ID'

dev-sg.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'Security Group for DEV Environment EC2 instances'

Parameters:
  Environment:
    Type: String
    Default: 'dev'
    Description: Environment prefix for resource names
  
  VPCId:
    Type: String
    Description: VPC ID where the security group will be created

Resources:
  # EC2用セキュリティグループ（全ての通信を許可）
  EC2SecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupName: !Sub '${Environment}-ec2-sg'
      GroupDescription: !Sub 'Security group for ${Environment} EC2 instances - Allow all traffic'
      VpcId: !Ref VPCId
      SecurityGroupIngress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
          Description: Allow all inbound traffic
      SecurityGroupEgress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
          Description: Allow all outbound traffic
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-ec2-sg'
        - Key: Environment
          Value: !Ref Environment

Outputs:
  EC2SecurityGroupId:
    Description: EC2 Security Group ID
    Value: !Ref EC2SecurityGroup
    Export:
      Name: !Sub '${Environment}-EC2-SG-ID'

prd-sg.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: 'Security Group for PRD Environment EC2 instances'

Parameters:
  Environment:
    Type: String
    Default: 'prd'
    Description: Environment prefix for resource names
  
  VPCId:
    Type: String
    Description: VPC ID where the security group will be created

Resources:
  # EC2用セキュリティグループ（全ての通信を許可）
  EC2SecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupName: !Sub '${Environment}-ec2-sg'
      GroupDescription: !Sub 'Security group for ${Environment} EC2 instances - Allow all traffic'
      VpcId: !Ref VPCId
      SecurityGroupIngress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
          Description: Allow all inbound traffic
      SecurityGroupEgress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
          Description: Allow all outbound traffic
      Tags:
        - Key: Name
          Value: !Sub '${Environment}-ec2-sg'
        - Key: Environment
          Value: !Ref Environment

Outputs:
  EC2SecurityGroupId:
    Description: EC2 Security Group ID
    Value: !Ref EC2SecurityGroup
    Export:
      Name: !Sub '${Environment}-EC2-SG-ID'

EC2のデプロイ

3つのVPCに一気にデプロイします。
ec2-key.pemという名前でキーペアを事前に作成しておいてください。

AWSTemplateFormatVersion: '2010-09-09'
Description: 'EC2 instances for DEV, STG, and PRD Environments in Ohio Region'

Parameters:
  # 共通パラメータ
  KeyPairName:
    Type: String
    Default: 'ec2-key'
    Description: Name of an existing EC2 KeyPair (ec2-key.pem)
  
  # DEV環境のパラメータ
  DevVPCId:
    Type: String
    Default: 'vpc-xxxxxxxxx'
    Description: VPC ID for DEV environment (172.16.0.0/16)
  
  DevSubnetId:
    Type: String
    Default: 'subnet-xxxxxxxxx'
    Description: Subnet ID for DEV environment (172.16.1.0/24)
  
  DevSecurityGroupId:
    Type: String
    Default: 'sg-xxxxxxxxx'
    Description: Security Group ID for DEV environment (dev-ec2-sg)
  
  # STG環境のパラメータ
  StgVPCId:
    Type: String
    Default: 'vpc-yyyyyyyyy'
    Description: VPC ID for STG environment (10.0.0.0/16)
  
  StgSubnetId:
    Type: String
    Default: 'subnet-yyyyyyyyy'
    Description: Subnet ID for STG environment (10.0.1.0/24)
  
  StgSecurityGroupId:
    Type: String
    Default: 'sg-yyyyyyyyy'
    Description: Security Group ID for STG environment (stg-ec2-sg)
  
  # PRD環境のパラメータ
  PrdVPCId:
    Type: String
    Default: 'vpc-zzzzzzzzz'
    Description: VPC ID for PRD environment (192.168.0.0/16)
  
  PrdSubnetId:
    Type: String
    Default: 'subnet-zzzzzzzzz'
    Description: Subnet ID for PRD environment (192.168.1.0/24)
  
  PrdSecurityGroupId:
    Type: String
    Default: 'sg-zzzzzzzzz'
    Description: Security Group ID for PRD environment (prd-ec2-sg)
  
  # インスタンスタイプ
  InstanceType:
    Type: String
    Default: 't2.micro'
    Description: EC2 instance type for all environments
    AllowedValues:
      - t2.micro
      - t2.small
      - t2.medium
      - t3.micro
      - t3.small
      - t3.medium
  
  # AMI ID (Ohio Region用)
  LatestAmiId:
    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
    Default: /aws/service/ami-amazon-linux-latest/al2023-ami-kernel-default-x86_64
    Description: Latest Amazon Linux 2023 AMI ID for us-east-2 (Ohio)

Resources:
  # ========== DEV環境 ==========
  # DEV用EC2インスタンス
  DevEC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: !Ref LatestAmiId
      InstanceType: !Ref InstanceType
      KeyName: !Ref KeyPairName
      SubnetId: !Ref DevSubnetId
      SecurityGroupIds:
        - !Ref DevSecurityGroupId
      Tags:
        - Key: Name
          Value: 'dev-ec2-instance'
        - Key: Environment
          Value: 'dev'
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          echo "Environment: dev" > /etc/environment-info
          echo "Region: us-east-2 (Ohio)" >> /etc/environment-info
          echo "Network: 172.16.0.0/16" >> /etc/environment-info

  # ========== STG環境 ==========
  # STG用EC2インスタンス
  StgEC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: !Ref LatestAmiId
      InstanceType: !Ref InstanceType
      KeyName: !Ref KeyPairName
      SubnetId: !Ref StgSubnetId
      SecurityGroupIds:
        - !Ref StgSecurityGroupId
      Tags:
        - Key: Name
          Value: 'stg-ec2-instance'
        - Key: Environment
          Value: 'stg'
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          echo "Environment: stg" > /etc/environment-info
          echo "Region: us-east-2 (Ohio)" >> /etc/environment-info
          echo "Network: 10.0.0.0/16" >> /etc/environment-info

  # ========== PRD環境 ==========
  # PRD用EC2インスタンス
  PrdEC2Instance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: !Ref LatestAmiId
      InstanceType: !Ref InstanceType
      KeyName: !Ref KeyPairName
      SubnetId: !Ref PrdSubnetId
      SecurityGroupIds:
        - !Ref PrdSecurityGroupId
      Tags:
        - Key: Name
          Value: 'prd-ec2-instance'
        - Key: Environment
          Value: 'prd'
      UserData:
        Fn::Base64: |
          #!/bin/bash
          yum update -y
          echo "Environment: prd" > /etc/environment-info
          echo "Region: us-east-2 (Ohio)" >> /etc/environment-info
          echo "Network: 192.168.0.0/16" >> /etc/environment-info

Outputs:
  # ========== DEV環境のOutputs ==========
  DevEC2InstanceId:
    Description: DEV EC2 Instance ID
    Value: !Ref DevEC2Instance
    Export:
      Name: 'dev-EC2-Instance-ID'
  
  DevEC2PublicIP:
    Description: DEV EC2 Public IP Address
    Value: !GetAtt DevEC2Instance.PublicIp
    Export:
      Name: 'dev-EC2-Public-IP'
  
  DevEC2PrivateIP:
    Description: DEV EC2 Private IP Address (172.16.x.x)
    Value: !GetAtt DevEC2Instance.PrivateIp
    Export:
      Name: 'dev-EC2-Private-IP'
  
  DevSSHCommand:
    Description: SSH command for DEV environment
    Value: !Sub 'ssh -i ec2-key.pem ec2-user@${DevEC2Instance.PublicIp}'

  # ========== STG環境のOutputs ==========
  StgEC2InstanceId:
    Description: STG EC2 Instance ID
    Value: !Ref StgEC2Instance
    Export:
      Name: 'stg-EC2-Instance-ID'
  
  StgEC2PublicIP:
    Description: STG EC2 Public IP Address
    Value: !GetAtt StgEC2Instance.PublicIp
    Export:
      Name: 'stg-EC2-Public-IP'
  
  StgEC2PrivateIP:
    Description: STG EC2 Private IP Address (10.0.x.x)
    Value: !GetAtt StgEC2Instance.PrivateIp
    Export:
      Name: 'stg-EC2-Private-IP'
  
  StgSSHCommand:
    Description: SSH command for STG environment
    Value: !Sub 'ssh -i ec2-key.pem ec2-user@${StgEC2Instance.PublicIp}'

  # ========== PRD環境のOutputs ==========
  PrdEC2InstanceId:
    Description: PRD EC2 Instance ID
    Value: !Ref PrdEC2Instance
    Export:
      Name: 'prd-EC2-Instance-ID'
  
  PrdEC2PublicIP:
    Description: PRD EC2 Public IP Address
    Value: !GetAtt PrdEC2Instance.PublicIp
    Export:
      Name: 'prd-EC2-Public-IP'
  
  PrdEC2PrivateIP:
    Description: PRD EC2 Private IP Address (192.168.x.x)
    Value: !GetAtt PrdEC2Instance.PrivateIp
    Export:
      Name: 'prd-EC2-Private-IP'
  
  PrdSSHCommand:
    Description: SSH command for PRD environment
    Value: !Sub 'ssh -i ec2-key.pem ec2-user@${PrdEC2Instance.PublicIp}'
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