【MySQL】Master稼働状態のままSlaveのレプリケーションを復旧

Master側での操作

#バックアップ取得 「-–master-data」オプションを付与することで、dump時のバイナリログ名、ポジションが記録される
[root@mysql-01 ~]# mysqldump --all-databases --add-drop-table --master-data -p > dump.db
Enter password:

#「CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000149', MASTER_LOG_POS=2793970;」を確認
[root@mysql-01 ~]# head -25 dump.db
-- MySQL dump 10.13  Distrib 5.7.21, for Linux (x86_64)
--
-- Host: localhost    Database:
-- ------------------------------------------------------
-- Server version       5.7.21-log

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Position to start replication or point-in-time recovery from
--

CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000149', MASTER_LOG_POS=2793970;

--
-- Current Database: `mysql`
[root@mysql-01 ~]#

Slave側での操作

#ログインしslaveを停止
[root@mysql-02 ~]# mysql -uroot -p
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 80212
Server version: 5.7.21-log MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

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.

mysql> stop slave;

#dumpファイルをリストア(scpか何かで持ってくる)
[root@mysql-02 ~]# mysql -uroot -p < dump.db
Enter password:
[root@mysql-02 ~]#

#MySQLへログインし直し、上で確認したログファイル、ポジションを指定しCHANGE MASTER TOを発行
mysql> CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000149',MASTER_LOG_POS=2793970;
Query OK, 0 rows affected (0.01 sec)

#slaveを再開
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

#同期していることを確認
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.1
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000149
          Read_Master_Log_Pos: 2802319
               Relay_Log_File: mysql-02-relay-bin.000002
                Relay_Log_Pos: 8669
        Relay_Master_Log_File: mysql-bin.000149
             Slave_IO_Running: Yes
            Slave_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_Master_Log_Pos: 2802319
              Relay_Log_Space: 8888
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1001
                  Master_UUID: b6e9a4e5-3e54-11e8-93fa-005056914f93
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

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