MySQL 8.4 : レプリケーション2026/02/17

# my.cnf が存在しない場合は以下の内容で新規作成
# 13行目 : 変更 (全てリスンする)
bind-address = 0.0.0.0

# 23行目 : コメント解除して変更 (一意なサーバーID を定義)
server-id = 101

# [mysqld] セクション内に追記 : クローンプラグインを有効にする
plugin-load = mysql_clone.so

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.4.7 Source distribution

Copyright (c) 2000, 2025, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

# レプリケーション用ユーザー作成 ([password] は任意のパスワードを設定)
mysql> create user 'repl_user'@'%' identified by 'password';
Query OK, 0 rows affected (0.10 sec)

mysql> grant replication slave on *.* to repl_user@'%'; 
Query OK, 0 rows affected (0.05 sec)

# クローン用ユーザー作成 ([password] は任意のパスワードを設定)
mysql> create user 'clone_user'@'%' identified by 'password'; 
Query OK, 0 rows affected (0.07 sec)

mysql> grant backup_admin on *.* to 'clone_user'@'%'; 
Query OK, 0 rows affected (0.06 sec)

mysql> exit
Bye

# my.cnf が存在しない場合は以下の内容で新規作成
# 31行目 : 変更 (全てリスンする)
bind-address = 0.0.0.0

# 23行目 : コメント解除して変更 (一意なサーバーID を定義)
server-id = 102

# [mysqld] セクション内に追記
# リードオンリー
read_only = 1
# 自身のホスト名を定義
report-host = node01.srv.world
# リレーログファイルを定義
relay-log = node01-relay-bin
relay-log-index = node01-relay-bin
# クローンプラグインを有効にする
plugin-load = mysql_clone.so

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.4.7 Source distribution

Copyright (c) 2000, 2025, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

# クローン用ユーザー作成 ([password] は任意のパスワードを設定)
mysql> create user 'clone_user'@'%' identified by 'password'; 
Query OK, 0 rows affected (0.07 sec)

mysql> grant clone_admin on *.* to 'clone_user'@'%'; 
Query OK, 0 rows affected (0.06 sec)

mysql> exit
Bye

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.4.7 Source distribution

Copyright (c) 2000, 2025, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

# [set global clone_valid_donor_list = (プライマリーサーバーの IP アドレス:ポート)]
mysql> set global clone_valid_donor_list = '10.0.0.30:3306'; 
Query OK, 0 rows affected (0.00 sec)

# クローン開始
mysql> clone instance from clone_user@10.0.0.30:3306 identified by 'password'; 
Query OK, 0 rows affected (0.49 sec)

# クローン状況確認
# [Completed] であればコピー完了
mysql> select ID,STATE,SOURCE,DESTINATION,BINLOG_FILE,BINLOG_POSITION from performance_schema.clone_status; 
+------+-----------+----------------+----------------+---------------+-----------------+
| ID   | STATE     | SOURCE         | DESTINATION    | BINLOG_FILE   | BINLOG_POSITION |
+------+-----------+----------------+----------------+---------------+-----------------+
|    1 | Completed | 10.0.0.30:3306 | LOCAL INSTANCE | binlog.000006 |             158 |
+------+-----------+----------------+----------------+---------------+-----------------+
1 row in set (0.00 sec)

# レプリケーションの設定
# source_host ⇒ プライマリーサーバーの IP アドレス
# source_user ⇒ レプリケーション用 ID
# source_password ⇒ レプリケーション用 ID のパスワード
# source_ssl ⇒ SSL 接続有効
# source_log_file ⇒ クローン確認で表示された [BINLOG_FILE] 値
# source_log_pos ⇒ クローン確認で表示された [BINLOG_POSITION] 値
mysql> change replication source to
source_host='10.0.0.30',
source_user='repl_user',
source_password='password',
source_ssl=1,
source_log_file='binlog.000006',
source_log_pos=158;
Query OK, 0 rows affected, 2 warnings (0.03 sec)

# レプリケーション開始
mysql> start replica; 
Query OK, 0 rows affected (0.03 sec)

# ステータス確認
mysql> show replica status\G 
*************************** 1. row ***************************
             Replica_IO_State: Waiting for source to send event
                  Source_Host: 10.0.0.30
                  Source_User: repl_user
                  Source_Port: 3306
                Connect_Retry: 60
              Source_Log_File: binlog.000006
          Read_Source_Log_Pos: 158
               Relay_Log_File: node01-relay-bin.000002
                Relay_Log_Pos: 325
        Relay_Source_Log_File: binlog.000006
           Replica_IO_Running: Yes
          Replica_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Source_Log_Pos: 158
              Relay_Log_Space: 537
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Source_SSL_Allowed: Yes
           Source_SSL_CA_File:
           Source_SSL_CA_Path:
              Source_SSL_Cert:
            Source_SSL_Cipher:
               Source_SSL_Key:
        Seconds_Behind_Source: 0
Source_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Source_Server_Id: 101
                  Source_UUID: 7609a460-0b93-11f1-a4ab-525400ce0df9
             Source_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
    Replica_SQL_Running_State: Replica has read all relay log; waiting for more updates
           Source_Retry_Count: 10
                  Source_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Source_SSL_Crl:
           Source_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Source_TLS_Version:
       Source_public_key_path:
        Get_Source_public_key: 0
            Network_Namespace:
1 row in set (0.00 sec)