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AWSTemplateFormatVersion: '2010-09-09'
Description: 'VPC Lattice Service Communication Pattern - Best Practices'

Parameters:
  Environment:
    Type: String
    Default: dev
    AllowedValues: [dev, staging, prod]

Resources:
  # VPC for Service A
  ServiceAVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.0.0.0/16
      EnableDnsHostnames: true
      EnableDnsSupport: true
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-a-vpc

  ServiceAPrivateSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref ServiceAVPC
      CidrBlock: 10.0.1.0/24
      AvailabilityZone: !Select [0, !GetAZs '']
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-a-private-subnet

  # VPC for Service B
  ServiceBVPC:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.1.0.0/16
      EnableDnsHostnames: true
      EnableDnsSupport: true
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-vpc

  ServiceBPrivateSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref ServiceBVPC
      CidrBlock: 10.1.1.0/24
      AvailabilityZone: !Select [0, !GetAZs '']
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-private-subnet

  # Security Groups
  ServiceASecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Security group for Service A
      VpcId: !Ref ServiceAVPC
      SecurityGroupEgress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-a-sg

  ServiceBSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Security group for Service B
      VpcId: !Ref ServiceBVPC
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 443
          ToPort: 443
          CidrIp: 10.0.0.0/16
      SecurityGroupEgress:
        - IpProtocol: -1
          CidrIp: 0.0.0.0/0
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-sg

  # VPC Lattice Service Network
  ServiceNetwork:
    Type: AWS::VpcLattice::ServiceNetwork
    Properties:
      AuthType: AWS_IAM
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-network
        - Key: Environment
          Value: !Ref Environment

  # VPC Lattice Service for Service B
  ServiceBLatticeService:
    Type: AWS::VpcLattice::Service
    Properties:
      AuthType: AWS_IAM
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b
        - Key: Environment
          Value: !Ref Environment

  # Target Group for Service B
  ServiceBTargetGroup:
    Type: AWS::VpcLattice::TargetGroup
    Properties:
      Type: INSTANCE
      Config:
        Port: 443
        Protocol: HTTPS
        VpcIdentifier: !Ref ServiceBVPC
        HealthCheck:
          Enabled: true
          Protocol: HTTPS
          Path: /health
          HealthCheckIntervalSeconds: 30
          HealthCheckTimeoutSeconds: 5
          HealthyThresholdCount: 2
          UnhealthyThresholdCount: 2
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-tg
        - Key: Environment
          Value: !Ref Environment

  # Listener for Service B
  ServiceBListener:
    Type: AWS::VpcLattice::Listener
    Properties:
      ServiceIdentifier: !Ref ServiceBLatticeService
      Protocol: HTTPS
      Port: 443
      DefaultAction:
        Forward:
          TargetGroups:
            - TargetGroupIdentifier: !Ref ServiceBTargetGroup
              Weight: 100
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-listener

  # Associate Service B with Service Network
  ServiceNetworkServiceAssociation:
    Type: AWS::VpcLattice::ServiceNetworkServiceAssociation
    Properties:
      ServiceIdentifier: !Ref ServiceBLatticeService
      ServiceNetworkIdentifier: !Ref ServiceNetwork
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-association

  # Associate Service A VPC with Service Network
  ServiceAVPCAssociation:
    Type: AWS::VpcLattice::ServiceNetworkVpcAssociation
    Properties:
      VpcIdentifier: !Ref ServiceAVPC
      ServiceNetworkIdentifier: !Ref ServiceNetwork
      SecurityGroupIds:
        - !Ref ServiceASecurityGroup
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-a-vpc-association

  # Associate Service B VPC with Service Network
  ServiceBVPCAssociation:
    Type: AWS::VpcLattice::ServiceNetworkVpcAssociation
    Properties:
      VpcIdentifier: !Ref ServiceBVPC
      ServiceNetworkIdentifier: !Ref ServiceNetwork
      SecurityGroupIds:
        - !Ref ServiceBSecurityGroup
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-b-vpc-association

  # CloudWatch Log Group for Access Logs
  AccessLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/vpclattice/${Environment}-service-network
      RetentionInDays: 7
      KmsKeyId: !GetAtt LogEncryptionKey.Arn

  # KMS Key for Log Encryption
  LogEncryptionKey:
    Type: AWS::KMS::Key
    Properties:
      Description: KMS key for VPC Lattice access logs encryption
      EnableKeyRotation: true
      KeyPolicy:
        Version: '2012-10-17'
        Statement:
          - Sid: Enable IAM User Permissions
            Effect: Allow
            Principal:
              AWS: !Sub arn:aws:iam::${AWS::AccountId}:root
            Action: kms:*
            Resource: '*'
          - Sid: Allow CloudWatch Logs
            Effect: Allow
            Principal:
              Service: !Sub logs.${AWS::Region}.amazonaws.com
            Action:
              - kms:Encrypt
              - kms:Decrypt
              - kms:ReEncrypt*
              - kms:GenerateDataKey*
              - kms:CreateGrant
              - kms:DescribeKey
            Resource: '*'
            Condition:
              ArnLike:
                kms:EncryptionContext:aws:logs:arn: !Sub arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/vpclattice/${Environment}-service-network

  LogEncryptionKeyAlias:
    Type: AWS::KMS::Alias
    Properties:
      AliasName: !Sub alias/${Environment}-vpclattice-logs
      TargetKeyId: !Ref LogEncryptionKey

  # Access Log Subscription
  AccessLogSubscription:
    Type: AWS::VpcLattice::AccessLogSubscription
    Properties:
      ResourceIdentifier: !Ref ServiceNetwork
      DestinationArn: !GetAtt AccessLogGroup.Arn
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-access-logs

  # IAM Role for Service A to invoke Service B
  ServiceAInvokeRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: ec2.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/CloudWatchAgentServerPolicy
      Policies:
        - PolicyName: VPCLatticeInvokePolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - vpc-lattice-svcs:Invoke
                Resource: !GetAtt ServiceBLatticeService.Arn
      Tags:
        - Key: Name
          Value: !Sub ${Environment}-service-a-role

Outputs:
  ServiceNetworkId:
    Description: VPC Lattice Service Network ID
    Value: !Ref ServiceNetwork
    Export:
      Name: !Sub ${Environment}-ServiceNetworkId

  ServiceNetworkArn:
    Description: VPC Lattice Service Network ARN
    Value: !GetAtt ServiceNetwork.Arn
    Export:
      Name: !Sub ${Environment}-ServiceNetworkArn

  ServiceBLatticeServiceId:
    Description: VPC Lattice Service B ID
    Value: !Ref ServiceBLatticeService
    Export:
      Name: !Sub ${Environment}-ServiceBLatticeServiceId

  ServiceBLatticeServiceArn:
    Description: VPC Lattice Service B ARN
    Value: !GetAtt ServiceBLatticeService.Arn
    Export:
      Name: !Sub ${Environment}-ServiceBLatticeServiceArn

  ServiceBTargetGroupId:
    Description: Target Group ID for Service B
    Value: !Ref ServiceBTargetGroup
    Export:
      Name: !Sub ${Environment}-ServiceBTargetGroupId

  ServiceAVPCId:
    Description: Service A VPC ID
    Value: !Ref ServiceAVPC
    Export:
      Name: !Sub ${Environment}-ServiceAVPCId

  ServiceBVPCId:
    Description: Service B VPC ID
    Value: !Ref ServiceBVPC
    Export:
      Name: !Sub ${Environment}-ServiceBVPCId

  ServiceAInvokeRoleArn:
    Description: IAM Role ARN for Service A to invoke Service B
    Value: !GetAtt ServiceAInvokeRole.Arn
    Export:
      Name: !Sub ${Environment}-ServiceAInvokeRoleArn
VPC Lattice サービス間通信

構成要素 (AWS Services):

アーキテクチャ図 (Architecture Diagram)

AWS CLI でのデプロイ例
