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@shun198

CloudFormationを使ってRDS(Postgres)を構築しよう！

Last updated at Posted at 2023-09-15

概要

今回はCloudFormationを使ってRDS(Postgres)を構築する方法について解説していきたいと思います

前提

  • VPC、プライベートサブネットをはじめとするネットワークを構築済み
  • 今回はPostgresのDBインスタンスを作成します

VPCをCloudFormationで作成されたい方は以下の記事を参考にしてください

ディレクトリ構成

構成は以下のとおりです

tree
.
└── templates
    ├── network
    |   └── vpc.yml
    ├── databases
    |   └── rds.yml
    └── security
        └── sg.yml

rds.yml

rds.yml
AWSTemplateFormatVersion: 2010-09-09
Description: "RDS (PostgreSQL) Stack"

# -------------------------------------
# Metadata
# -------------------------------------
Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: "Project Configuration"
        Parameters:
          - ProjectName
          - Environment
      - Label:
          default: "RDS (PostgreSQL) Configuration"
        Parameters:
          - PostgreSQLMajorVersion
          - PostgreSQLMinorVersion
          - RDSDBInstanceClass
          - RDSDBInstanceStorageSize
          - RDSDBInstanceStorageType
          - RDSDBName
          - RDSDBMasterUserName
          - RDSDBMasterUserPassword
          - MultiAZEnabled
          - RDSPrivateSubnet1
          - RDSPrivateSubnet2
          - RDSDBSecurityGroupID
          - EnablePerformanceInsights
          - BackupRetentionPeriod
          - PreferredBackupWindow
          - PreferredMaintenanceWindow
          - AutoMinorVersionUpgradeEnabled
          - DeletionProtectionEnabled

# -------------------------------------
# Parameters
# -------------------------------------
Parameters:
  ProjectName:
    Description: "Enter the project name. (ex: my-project)"
    Type: String
    Default: my-project
    ConstraintDescription: "ProjectName is required."
    MinLength: 1
  Environment:
    Description: "Select the environment."
    Type: String
    AllowedValues:
      - dev
      - stg
      - prd
    ConstraintDescription: "Environment must be select."
  PostgreSQLMajorVersion:
    Description: "Select the PostgreSQL engine major version. (default: 15)"
    Type: String
    Default: 15
    AllowedValues: [15]
  PostgreSQLMinorVersion:
    Description: "Select the PostgreSQL engine minor version."
    Type: String
    Default: 2
    AllowedValues: [2]
  RDSDBInstanceClass:
    Description: "Select the DB Instance class. (default: db:t3.small)"
    Type: String
    Default: db.t3.small
    AllowedValues:
      - db.m5.large
      - db.r5.large
      - db.t3.micro
      - db.t3.small
      - db.t3.medium
  RDSDBInstanceStorageSize:
    Description: "Enter the DB Instance storage size. (default: 20 GiB)"
    Type: String
    Default: 20
  RDSDBInstanceStorageType:
    Description: "Enter the DB Instance storage type. (default: gp3)"
    Type: String
    Default: gp3
    AllowedValues: [gp3, io1]
  RDSDBName:
    Description: "Enter the database name. (default: postgres)"
    Type: String
    Default: postgres
  RDSDBMasterUserName:
    Description: "Enter the master username."
    Type: String
    Default: postgres
  RDSDBMasterUserPassword:
    Description: "Enter the master password."
    Type: String
    Default: postgres
    NoEcho: true
  MultiAZEnabled:
    Description: "Select whether you want to enable Multi-AZ or not. (default: false)"
    Type: String
    Default: false
    AllowedValues: [true, false]
  RDSPrivateSubnet1:
    Description: "Enter the Subnet ID for RDS in the selected VPC."
    Type: AWS::EC2::Subnet::Id
  RDSPrivateSubnet2:
    Description: "Enter the Subnet ID for RDS in the selected VPC."
    Type: AWS::EC2::Subnet::Id
  RDSDBSecurityGroupID:
    Description: "Select the Security Group ID for RDS."
    Type: AWS::EC2::SecurityGroup::Id
  EnablePerformanceInsights:
    Description: "Select whether to enable performance insights. "
    Type: String
    Default: true
    AllowedValues: [true, false]
  BackupRetentionPeriod:
    Description: "Select the backup retention period."
    Type: String
    Default: 35
    AllowedValues: [0, 1, 3, 7, 14, 21, 30, 35]
  PreferredBackupWindow:
    Description: "Enter the time of day to perform backups, separated by 30 minutes. (format/UTC: hh24:mi-hh24:mi)"
    Type: String
    Default: 19:00-19:30
  PreferredMaintenanceWindow:
    Description: "Enter the time of day to perform maintenances, separated by 30 minutes. (format/UTC: ddd:hh24:mi-ddd:hh24:mi)"
    Type: String
    Default: sun:20:00-sun:20:30
  AutoMinorVersionUpgradeEnabled:
    Description: "Select whether to enable RDS DB Instance minor version auto upgrade."
    Type: String
    Default: true
    AllowedValues: [true, false]
  DeletionProtectionEnabled:
    Description: "Select whether to enable deletion protection."
    Type: String
    Default: false
    AllowedValues: [true, false]

# -------------------------------------
# Resources
# -------------------------------------
Resources:
  # -------------------------------------
  # IAM Role
  # -------------------------------------
  RDSMonitoringRole:
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Sub RDSMonitoringRole-${ProjectName}-${Environment}
      Path: /service-role/
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service: monitoring.rds.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AmazonRDSEnhancedMonitoringRole

  # -------------------------------------
  # DB SubnetGroup
  # -------------------------------------
  RDSDBSubnetGroup:
    Type: AWS::RDS::DBSubnetGroup
    Properties:
      DBSubnetGroupName: !Sub ${ProjectName}-${Environment}-rds-sbng
      DBSubnetGroupDescription: !Sub ${ProjectName}-${Environment}-rds-sbng
      SubnetIds:
        - !Ref RDSPrivateSubnet1
        - !Ref RDSPrivateSubnet2
      Tags:
        - Key: Name
          Value: !Sub ${ProjectName}-${Environment}-rds-sbng
        - Key: ProjectName
          Value: !Ref ProjectName
        - Key: Environment
          Value: !Ref Environment
  
  # -------------------------------------
  # DB ParameterGroup
  # -------------------------------------
  RDSDBParameterGroup:
    Type: AWS::RDS::DBParameterGroup
    Properties:
      Description: !Sub ${ProjectName}-${Environment}-rds-pg
      Family: !Sub postgres${PostgreSQLMajorVersion}
      Parameters:
        log_duration: 1
        log_min_duration_statement: 10000
        log_statement: all
        timezone: Asia/Tokyo

  # -------------------------------------
  # DB Instance
  # -------------------------------------
  RDSDBInstance:
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Type: AWS::RDS::DBInstance
    Properties:
      Engine: postgres
      EngineVersion: !Sub ${PostgreSQLMajorVersion}.${PostgreSQLMinorVersion}
      DBInstanceIdentifier: !Sub ${ProjectName}-${Environment}-rds
      MasterUsername: !Ref RDSDBMasterUserName
      MasterUserPassword: !Ref RDSDBMasterUserPassword
      DBInstanceClass: !Ref RDSDBInstanceClass
      StorageType: !Ref RDSDBInstanceStorageType
      AllocatedStorage: !Ref RDSDBInstanceStorageSize
      MultiAZ: !Ref MultiAZEnabled
      DBSubnetGroupName: !Ref RDSDBSubnetGroup
      PubliclyAccessible: false
      VPCSecurityGroups:
        - !Ref RDSDBSecurityGroupID
      DBName: !Ref RDSDBName
      DBParameterGroupName: !Ref RDSDBParameterGroup
      BackupRetentionPeriod: !Ref BackupRetentionPeriod
      PreferredBackupWindow: !Ref PreferredBackupWindow
      CopyTagsToSnapshot: true
      StorageEncrypted: true
      EnablePerformanceInsights: !Ref EnablePerformanceInsights
      MonitoringInterval: 60
      MonitoringRoleArn: !GetAtt RDSMonitoringRole.Arn
      EnableCloudwatchLogsExports: [postgresql]
      AutoMinorVersionUpgrade: !Ref AutoMinorVersionUpgradeEnabled
      PreferredMaintenanceWindow: !Ref PreferredMaintenanceWindow
      DeletionProtection: !Ref DeletionProtectionEnabled
      Tags:
        - Key: Name
          Value: !Sub ${ProjectName}-${Environment}-rds
        - Key: ProjectName
          Value: !Ref ProjectName
        - Key: Environment
          Value: !Ref Environment

# ------------------------------------------------------------
# Output
# ------------------------------------------------------------
Outputs:
  RDSDBInstanceID:
    Value: !Ref RDSDBInstance
  RDSDBInstanceEndpoint:
    Value: !GetAtt RDSDBInstance.Endpoint.Address
  RDSDBName:
    Value: !Ref RDSDBName

一つずつ解説します

MetaData

Metadataを使用する際に

AWS::CloudFormation::Interface:

と記載することで後述するParametersをグループ分けして見やすくすることができます
今回は

  • Common Configuration(汎用的な設定)
    • プロジェクト名や環境(dev,stg,prd)などタグ付けに必要な変数
  • RDS (PostgreSQL) Configuration(RDSの設定)

の2種類に分類します

rds.yml
# -------------------------------------
# Metadata
# -------------------------------------
Metadata:
  AWS::CloudFormation::Interface:
    # パラメータの並び順
    ParameterGroups:
      - Label:
          default: "Project Configuration"
        Parameters:
          - ProjectName
          - Environment
      - Label:
          default: "RDS (PostgreSQL) Configuration"
        Parameters:
          - PostgreSQLMajorVersion
          - PostgreSQLMinorVersion
          - RDSDBInstanceClass
          - RDSDBInstanceStorageSize
          - RDSDBInstanceStorageType
          - RDSDBName
          - RDSDBMasterUserName
          - RDSDBMasterUserPassword
          - MultiAZEnabled
          - RDSPrivateSubnet1
          - RDSPrivateSubnet2
          - RDSDBSecurityGroupID
          - EnablePerformanceInsights
          - BackupRetentionPeriod
          - PreferredBackupWindow
          - PreferredMaintenanceWindow
          - AutoMinorVersionUpgradeEnabled
          - DeletionProtectionEnabled

Parameters

Metadataで説明したパラメータのデフォルト値の設定などを行います
Paratemerの詳細は後述するRDSDBInstanceでも説明します

rds.yml
# -------------------------------------
# Parameters
# -------------------------------------
Parameters:
  ProjectName:
    Description: "Enter the project name. (ex: my-project)"
    Type: String
    Default: my-project
    ConstraintDescription: "ProjectName is required."
    MinLength: 1
  Environment:
    Description: "Select the environment."
    Type: String
    AllowedValues:
      - dev
      - stg
      - prd
    ConstraintDescription: "Environment must be select."
  PostgreSQLMajorVersion:
    Description: "Select the PostgreSQL engine major version. (default: 15)"
    Type: String
    Default: 15
    AllowedValues: [15]
  PostgreSQLMinorVersion:
    Description: "Select the PostgreSQL engine minor version."
    Type: String
    Default: 2
    AllowedValues: [2]
  RDSDBInstanceClass:
    Description: "Select the DB Instance class. (default: db:t3.small)"
    Type: String
    Default: db.t3.small
    AllowedValues:
      - db.m5.large
      - db.r5.large
      - db.t3.micro
      - db.t3.small
      - db.t3.medium
  RDSDBInstanceStorageSize:
    Description: "Enter the DB Instance storage size. (default: 20 GiB)"
    Type: String
    Default: 20
  RDSDBInstanceStorageType:
    Description: "Enter the DB Instance storage type. (default: gp3)"
    Type: String
    Default: gp3
    AllowedValues: [gp3, io1]
  RDSDBName:
    Description: "Enter the database name. (default: postgres)"
    Type: String
    Default: postgres
  RDSDBMasterUserName:
    Description: "Enter the master username."
    Type: String
    Default: postgres
  RDSDBMasterUserPassword:
    Description: "Enter the master password."
    Type: String
    Default: postgres
    NoEcho: true
  MultiAZEnabled:
    Description: "Select whether you want to enable Multi-AZ or not. (default: false)"
    Type: String
    Default: false
    AllowedValues: [true, false]
  # ドロップダウンから自身が作成したプライベートサブネットを選択する
  RDSPrivateSubnet1:
    Description: "Enter the Subnet ID for RDS in the selected VPC."
    Type: AWS::EC2::Subnet::Id
  RDSPrivateSubnet2:
    Description: "Enter the Subnet ID for RDS in the selected VPC."
    Type: AWS::EC2::Subnet::Id
  RDSDBSecurityGroupID:
    Description: "Select the Security Group ID for RDS."
    Type: AWS::EC2::SecurityGroup::Id
  EnablePerformanceInsights:
    Description: "Select whether to enable performance insights. "
    Type: String
    Default: true
    AllowedValues: [true, false]
  BackupRetentionPeriod:
    Description: "Select the backup retention period."
    Type: String
    Default: 35
    AllowedValues: [0, 1, 3, 7, 14, 21, 30, 35]
  PreferredBackupWindow:
    Description: "Enter the time of day to perform backups, separated by 30 minutes. (format/UTC: hh24:mi-hh24:mi)"
    Type: String
    Default: 19:00-19:30
  PreferredMaintenanceWindow:
    Description: "Enter the time of day to perform maintenances, separated by 30 minutes. (format/UTC: ddd:hh24:mi-ddd:hh24:mi)"
    Type: String
    Default: sun:20:00-sun:20:30
  AutoMinorVersionUpgradeEnabled:
    Description: "Select whether to enable RDS DB Instance minor version auto upgrade."
    Type: String
    Default: true
    AllowedValues: [true, false]
  DeletionProtectionEnabled:
    Description: "Select whether to enable deletion protection."
    Type: String
    # 今回は検証用でfalseにします
    Default: false
    AllowedValues: [true, false]

RDSMonitoringRole

RDSの拡張モニタリングの設定をします
デフォルトではfalseになってますが下記のように設定することで
AmazonRDSEnhancedMonitoringRoleを使ってCloudWatchにログを保存できます

rds.yml
Resources:
  # -------------------------------------
  # IAM Role
  # -------------------------------------
  RDSMonitoringRole:
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Sub RDSMonitoringRole-${ProjectName}-${Environment}
      Path: /service-role/
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service: monitoring.rds.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AmazonRDSEnhancedMonitoringRole

RDSDBSubnetGroup

RDSのサブネットグループの設定を行います
すでに作成したVPC内のプライベートサブネットと紐付けます

rds.yml
  # -------------------------------------
  # DB SubnetGroup
  # -------------------------------------
  RDSDBSubnetGroup:
    Type: AWS::RDS::DBSubnetGroup
    Properties:
      DBSubnetGroupName: !Sub ${ProjectName}-${Environment}-rds-sbng
      DBSubnetGroupDescription: !Sub ${ProjectName}-${Environment}-rds-sbng
      SubnetIds:
        - !Ref RDSPrivateSubnet1
        - !Ref RDSPrivateSubnet2
      Tags:
        - Key: Name
          Value: !Sub ${ProjectName}-${Environment}-rds-sbng
        - Key: ProjectName
          Value: !Ref ProjectName
        - Key: Environment
          Value: !Ref Environment

RDSDBParameterGroup

RDSのパラメータグループの設定です
パラメータグループを指定してDBインスタンスを作成するのが一般的です
今回はPostgresを使用しているのでパラメータの一覧は以下の記事に記載されています

rds.yml
  # -------------------------------------
  # DB ParameterGroup
  # -------------------------------------
  RDSDBParameterGroup:
    Type: AWS::RDS::DBParameterGroup
    Properties:
      Description: !Sub ${ProjectName}-${Environment}-rds-pg
      Family: !Sub postgres${PostgreSQLMajorVersion}
      Parameters:
        # SQLの経過時間をログとして残す
        # 1なのでTrue
        log_duration: 1
        # SQLの実行に要した時間をログに記録
        # 10000を指定したので10000msもしくはそれ以上長くかかった全てのSQL文がログとして残る
        log_min_duration_statement: 10000
        # どのSQL文をログに記録するか決める。allなので全て
        log_statement: all
        # タイムゾーン
        timezone: Asia/Tokyo

RDSDBInstance

RDSインスタンスの設定を行います

rds.yml
  # -------------------------------------
  # DB Instance
  # -------------------------------------
  RDSDBInstance:
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Type: AWS::RDS::DBInstance
    Properties:
      Engine: postgres
      EngineVersion: !Sub ${PostgreSQLMajorVersion}.${PostgreSQLMinorVersion}
      DBInstanceIdentifier: !Sub ${ProjectName}-${Environment}-rds
      MasterUsername: !Ref RDSDBMasterUserName
      MasterUserPassword: !Ref RDSDBMasterUserPassword
      DBInstanceClass: !Ref RDSDBInstanceClass
      StorageType: !Ref RDSDBInstanceStorageType
      AllocatedStorage: !Ref RDSDBInstanceStorageSize
      MultiAZ: !Ref MultiAZEnabled
      DBSubnetGroupName: !Ref RDSDBSubnetGroup
      PubliclyAccessible: false
      VPCSecurityGroups:
        - !Ref RDSDBSecurityGroupID
      DBName: !Ref RDSDBName
      DBParameterGroupName: !Ref RDSDBParameterGroup
      BackupRetentionPeriod: !Ref BackupRetentionPeriod
      PreferredBackupWindow: !Ref PreferredBackupWindow
      CopyTagsToSnapshot: true
      StorageEncrypted: true
      EnablePerformanceInsights: !Ref EnablePerformanceInsights
      MonitoringInterval: 60
      MonitoringRoleArn: !GetAtt RDSMonitoringRole.Arn
      EnableCloudwatchLogsExports: [postgresql]
      AutoMinorVersionUpgrade: !Ref AutoMinorVersionUpgradeEnabled
      PreferredMaintenanceWindow: !Ref PreferredMaintenanceWindow
      DeletionProtection: !Ref DeletionProtectionEnabled
      Tags:
        - Key: Name
          Value: !Sub ${ProjectName}-${Environment}-rds
        - Key: ProjectName
          Value: !Ref ProjectName
        - Key: Environment
          Value: !Ref Environment

Property

前述で設定したParametersの値を踏まえてRDSDBInstanceのPropertyの一覧を記載します
今回はあくまで一例ですのでプロジェクトに応じて値を設定していただければと思います

パラメータ名 説明 値・デフォルト値
Engine DBの種類 postgres
EngineVersion DBのバージョン 15.2
MasterUsername DBのマスターユーザ名 postgres
MasterUserPassword DBのマスターパスワード postgres
DBInstanceClass DBインスタンスのクラス(例:db.m4.large) db.t3.small
StorageType DB用のストレージの種類(例:gp2) gp3
AllocatedStorage DBインスタンスに割り当てるストレージの容量 20GB
MultiAZ 複数のAZでインスタンスを生成するかどうか false
DBSubnetGroupName サブネットグループの設定 サブネットグループ
PubliclyAccessible RDSがインターネットからアクセス可能かどうか false
VPCSecurityGroups RDSのセキュリティグループ 後述のsg.ymlで作成したSGのID
DBName DB名 postgres
DBParameterGroupName パラメータグループの設定 パラメータグループ
BackupRetentionPeriod 自動バックアップを保持する日数 35日
PreferredBackupWindow 自動バックアップが作成される毎日の時間帯 19:00-19:30
CopyTagsToSnapshot DBインスタンスのスナップショットにタグをコピーするかどうか true
StorageEncrypted DBインスタンスを暗号化するかどうか 今回はtrueにします
EnablePerformanceInsights パフォーマンスインサイトを有効にするかどうか
Postgresだと全てのインスタンスタイプをサポートしていますが、MySQLとMariaDBだとインスタンスによってサポートされていなかったりするので注意が必要です
https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/UserGuide/USER_PerfInsights.Overview.Engines.html 		true
MonitoringInterval DB インスタンスまたはリードレプリカのメトリクスが収集される間隔 (秒単位) 60
MonitoringRoleArn モニタリング用のロールのArn モニタリング用のロールのArn
EnableCloudwatchLogsExports RDSのログをCloudWatchに出力する設定 [postgresql]
AutoMinorVersionUpgrade マイナーバージョンへのアップグレードの有効化 true
PreferredMaintenanceWindow システムメンテナンスが可能な時間帯 sun:20:00-sun:20:30
DeletionProtection DBの削除保護を有効化するかどうか false

sg.yml

今回はECS FagrateとRDS用のセキュリティグループを作成します
ECSからRDSへ5432番ポートへのインバウンドアクセスを許可します

sg.yml
AWSTemplateFormatVersion: 2010-09-09
Description: "Security Group Stack"

# -------------------------------------
# Metadata
# -------------------------------------
Metadata:
  AWS::CloudFormation::Interface:
    # パラメータの並び順
    ParameterGroups:
      - Label:
          default: "Project Configuration"
        Parameters:
          - ProjectName
          - Environment
      - Label:
          default: "Security Group Configuration"
        Parameters:
          - VPCID

# -------------------------------------
# Input parameters
# -------------------------------------
Parameters:
  ProjectName:
    Description: "Enter the project name. (ex: my-project)"
    Type: String
    MinLength: 1
    ConstraintDescription: "ProjectName must be enter."
    Default: my-project
  Environment:
    Description: "Select the environment."
    Type: String
    AllowedValues:
      - dev
      - stg
      - prd
    ConstraintDescription: "Environment must be select."
  VPCID:
    Description: "Enter the VPC ID for create security groups."
    Type: AWS::EC2::VPC::Id

# -------------------------------------
# Resources
# -------------------------------------
Resources:
  # For ECS Fargate
  FargateSG:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupName: !Sub ${ProjectName}-${Environment}-fargate-sg
      GroupDescription: "Security Group For ECS Fargate"
      VpcId: !Ref VPCID
      Tags:
        - Key: Name
          Value: !Sub ${ProjectName}-${Environment}-fargate-sg
        - Key: ProjectName
          Value: !Ref ProjectName
        - Key: Environment
          Value: !Ref Environment
  # For RDS (PostgreSQL)
  RDSForPostgreSQLSG:
    Type: AWS::EC2::SecurityGroup
    Properties:
      VpcId: !Ref VPCID
      GroupName: !Sub ${ProjectName}-${Environment}-rds-sg
      GroupDescription: "Security Group For RDS (PostgreSQL)"
      Tags:
        - Key: Name
          Value: !Sub ${ProjectName}-${Environment}-rds-sg
  RDSForPostgreSQLSGIngress:
    Type: AWS::EC2::SecurityGroupIngress
    Properties:
      GroupId: !Ref RDSForPostgreSQLSG
      IpProtocol: tcp
      FromPort: 5432
      ToPort: 5432
      Description: "from fargate"

# -------------------------------------
# Output parameters
# -------------------------------------
Outputs:
  FargateSG:
    Description: "Security Group For ECS Fargate with ALB"
    Value: !Ref FargateSG
  RDSForPostgreSQLSG:
    Description: "Security Group For RDS (PostgreSQL)"
    Value: !Ref RDSForPostgreSQLSG

実際に作成してみよう！

SG

RDS用のSGのStackを作成します
その際にすでにVPCを作成されているのであればドロップダウンから選択します
スクリーンショット 2023-09-14 19.27.22.png

RDSのSGが以下のように作成されたら成功です
スクリーンショット 2023-09-14 19.29.29.png
スクリーンショット 2023-09-14 19.46.21.png
スクリーンショット 2023-09-14 19.46.50.png

RDS

RDSのStackを作成します
スクリーンショット 2023-09-10 15.52.32.png

以下のように作成されたら成功です
スクリーンショット 2023-09-14 19.54.06.png

参考

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