MySQL多源复制

mac2022-06-30 73

MySQL多源复制

1. 配置多源复制 1.1 配置环境如下1.2 从库的重要参数配置1.3 在Master上导出需要同步的数据库1.4 在master上创建复制账号1.5 备份数据导入1.6 查看备份文件中Master1与Master2的binlog Pos位置1.7 Slave进行change master操作1.8 开启主从复制2. 监控多源复制 MySQL多源复制使slave能够同时从多个源master接收事务。多源复制可用于将多个服务器备份到单个服务器，合并表分片，以及将来自多个服务器的数据合并到单个服务器。应用事务时，多源复制不会实现任何冲突检测或解决，如果需要，这些任务将留给应用程序。在多源复制拓扑中，slave服务器应从每个接收事务的主服务器创建复制通道。以下部分介绍如何设置多源复制。

1. 配置多源复制

介绍如何配置多源复制拓扑，并提供有关配置master和slave的详细信息。这种拓扑需要至少两个master设备和一个slave设备配置。

1.1 配置环境如下

类型IP端口号server-id复制通道master192.168.56.10033061003306master1master192.168.56.10033071003307master2slave192.168.56.20033082003308

1.2 从库的重要参数配置

在多源复制中，slave需要基于TABLE的存储库。多源复制与基于FILE的存储库不兼容。mysqld使用的存储库类型可以在启动时配置，也可以动态配置。

启动时配置my.cnfmaster-info-repository=TABLE relay-log-info-repository=TABLE 在线动态配置STOP SLAVE; SET GLOBAL master_info_repository = 'TABLE'; SET GLOBAL relay_log_info_repository = 'TABLE';

1.3 在Master上导出需要同步的数据库

利用mysqldump进行备份及恢复，mysqldump的使用方法见博客MySQL备份恢复

在master1上mysqldump -S /tmp/mysql3306.sock --master-data=2 --single-transaction --add-drop-database --databases employees > /tmp/empdb.sql 在master2上mysqldump -S /tmp/mysql3307.sock --master-data=2 --single-transaction --add-drop-database --databases test > /tmp/testdb.sql 把备份传输到slave上scp /tmp/empdb.sql /tmp/testdb.sql mysqldb2:/data/backup/

1.4 在master上创建复制账号

在master1上

mysql> create user 'repl'@'%' identified by 'wanbin'; mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

在master2上

mysql> create user 'repl'@'%' identified by 'wanbin'; mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';

1.5 备份数据导入

mysql -S /tmp/mysql3308.sock < empdb.sql ERROR 1840 (HY000) at line 24: @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty. #出现错误 #解决方法： mysql> reset master; mysql -S /tmp/mysql3308.sock < empdb.sql mysql -S /tmp/mysql3308.sock < testdb.sql

1.6 查看备份文件中Master1与Master2的binlog Pos位置

cat empdb.sql |grep "CHANGE MASTER" -- CHANGE MASTER TO MASTER_LOG_FILE='my3306_binlog.000004', MASTER_LOG_POS=194; cat testdb.sql |grep "CHANGE MASTER" -- CHANGE MASTER TO MASTER_LOG_FILE='my3307_binlog.000011', MASTER_LOG_POS=194;

1.7 Slave进行change master操作

#创建复制账号 create user 'repl'@'%' identified by 'wanbin'; GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%'; #change master CHANGE MASTER TO MASTER_HOST='192.168.56.100', MASTER_USER='repl', MASTER_PASSWORD='wanbin', MASTER_PORT=3306, MASTER_LOG_FILE='my3306_binlog.000004', MASTER_LOG_POS=194 FOR CHANNEL 'master1'; CHANGE MASTER TO MASTER_HOST='192.168.56.100', MASTER_USER='repl', MASTER_PASSWORD='wanbin', MASTER_PORT=3307, MASTER_LOG_FILE='my3307_binlog.000011', MASTER_LOG_POS=194 FOR CHANNEL 'master2';

1.8 开启主从复制

可以通过start slave命令开启所有复制，也可以通过 start slave for channel 来分别开启。

mysql> start slave for CHANNEL 'master1'; mysql> start slave for CHANNEL 'master2';

2. 监控多源复制

要监视复制通道的状态，需要以下选项：使用复制Performance Schema表。这些表的第一列是Channel_Name。这使您可以基于Channel_Name作为键来编写复杂查询。

使用SHOW SLAVE STATUS FOR CHANNEL Channel_Name。默认情况下，如果未使用FOR CHANNEL通道子句，则此语句显示所有通道的从站状态，每个通道一行。标识符Channel_name将添加为结果集中的列。如果提供了FOR CHANNEL通道子句，则结果仅显示指定复制通道的状态。

root@localhost [test] 15:46:02>SHOW SLAVE STATUS FOR CHANNEL 'master1'\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.56.100 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: my3306_binlog.000004 Read_Master_Log_Pos: 973 Relay_Log_File: mysqldb2-relay-bin-master1.000002 Relay_Log_Pos: 1103 Relay_Master_Log_File: my3306_binlog.000004 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: 973 Relay_Log_Space: 1321 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: 1003306 Master_UUID: 7390a401-b705-11e8-9ed9-080027b0b461 Master_Info_File: mysql.slave_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: 7390a401-b705-11e8-9ed9-080027b0b461:10-13 Executed_Gtid_Set: 3a068bf8-cdeb-11e8-8176-080027b0b461:1-16, 7390a401-b705-11e8-9ed9-080027b0b461:10-13, d934e7cb-d1d1-11e8-85ce-0800275b8a9a:1-3 Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: master1 Master_TLS_Version: 1 row in set (0.00 sec)

使用Performance Schema.replication_connection_status 表监控

root@localhost [test] 15:49:21>use performance_schema Database changed root@localhost [performance_schema] 15:49:43>select * from replication_connection_status\G *************************** 1. row *************************** CHANNEL_NAME: master1 GROUP_NAME: SOURCE_UUID: 7390a401-b705-11e8-9ed9-080027b0b461 THREAD_ID: 44 SERVICE_STATE: ON COUNT_RECEIVED_HEARTBEATS: 64 LAST_HEARTBEAT_TIMESTAMP: 2018-10-17 15:49:41 RECEIVED_TRANSACTION_SET: 7390a401-b705-11e8-9ed9-080027b0b461:10-13 LAST_ERROR_NUMBER: 0 LAST_ERROR_MESSAGE: LAST_ERROR_TIMESTAMP: 0000-00-00 00:00:00 *************************** 2. row *************************** CHANNEL_NAME: master2 GROUP_NAME: SOURCE_UUID: 3a068bf8-cdeb-11e8-8176-080027b0b461 THREAD_ID: 47 SERVICE_STATE: ON COUNT_RECEIVED_HEARTBEATS: 58 LAST_HEARTBEAT_TIMESTAMP: 2018-10-17 15:49:23 RECEIVED_TRANSACTION_SET: 3a068bf8-cdeb-11e8-8176-080027b0b461:14-16 LAST_ERROR_NUMBER: 0 LAST_ERROR_MESSAGE: LAST_ERROR_TIMESTAMP: 0000-00-00 00:00:00 2 rows in set (0.00 sec)

转载于:https://www.cnblogs.com/wanbin/p/9899599.html

相关资源：MySQL 5.7.18多源复制搭建

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