多源复制

1、基础环境

10.0.0.100 master
10.0.0.101 master
10.0.0.102 slave

image.png

2、从库准备

多源复制于之前常规的主从复制还是有一定的配置方面的区别的

• 配置文件，在原有从库的基础上，需要单独加上下面的配置

master_info_repository  =table
relay_log_info_repository =table

#不加这两个参数，下面我们在加入主库时会报错

3、从库备份恢复

mysqldump -uroot -p123 -h10.0.0.100 --master-data=2 --single-transaction -A >/tmp/full.sql

mysqldump -uroot -p123 -h10.0.0.101 --master-data=2 --single-transaction >/tmp/full1.sql

mysql> source /tmp/full.sql;
mysql> source /tmp/full1.sql;

此时我们要复制的两个主库的数据，那么需要我们备份恢复两份数据，100一份，101一份

4、加入主库并开启出从复制

mysql> CHANGE MASTER TO 
    -> MASTER_HOST='10.0.0.100',
    -> MASTER_USER='repl',
    -> MASTER_PASSWORD='123',
    -> MASTER_AUTO_POSITION=1 FOR CHANNEL 'Master_1';
Query OK, 0 rows affected, 2 warnings (0.02 sec)

mysql> CHANGE MASTER TO 
    -> MASTER_HOST='10.0.0.101',
    -> MASTER_USER='repl',
    -> MASTER_PASSWORD='123',
    -> MASTER_AUTO_POSITION=1 FOR CHANNEL 'Master_2';
Query OK, 0 rows affected, 2 warnings (0.02 sec)

mysql> start slave for CHANNEL 'Master_1';
Query OK, 0 rows affected (0.01 sec)

mysql> start slave for CHANNEL 'Master_2';
Query OK, 0 rows affected (0.00 sec)

mysql> SHOW SLAVE STATUS FOR CHANNEL 'Master_1'\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.100
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000018
          Read_Master_Log_Pos: 314
               Relay_Log_File: db03-relay-bin-master_1.000003
                Relay_Log_Pos: 407
        Relay_Master_Log_File: mysql-bin.000018
             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: 314
              Relay_Log_Space: 691801
              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: 100
                  Master_UUID: 0706ef47-886c-11eb-a9f0-000c29aec9e2
             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: 0706ef47-886c-11eb-a9f0-000c29aec9e2:1-13
            Executed_Gtid_Set: 0706ef47-886c-11eb-a9f0-000c29aec9e2:1-13,
1518e04e-8638-11eb-a908-000c29aec9e2:1-24,
7e75646b-8638-11eb-83ab-000c29516958:1-3,
8c88da03-86be-11eb-ac3c-000c29aec9e2:1-10,
93f12623-86ce-11eb-9689-000c29aec9e2:1-67,
979a98c9-86ce-11eb-96b5-000c29eb57ff:1-55
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: master_1
           Master_TLS_Version: 
1 row in set (0.00 sec)

ERROR: 
No query specified

mysql> SHOW SLAVE STATUS FOR CHANNEL 'Master_2'\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.101
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000012
          Read_Master_Log_Pos: 21120919
               Relay_Log_File: db03-relay-bin-master_2.000002
                Relay_Log_Pos: 21103502
        Relay_Master_Log_File: mysql-bin.000012
             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: 21120919
              Relay_Log_Space: 21103717
              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: 101
                  Master_UUID: 979a98c9-86ce-11eb-96b5-000c29eb57ff
             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: 979a98c9-86ce-11eb-96b5-000c29eb57ff:1-55
            Executed_Gtid_Set: 0706ef47-886c-11eb-a9f0-000c29aec9e2:1-13,
1518e04e-8638-11eb-a908-000c29aec9e2:1-24,
7e75646b-8638-11eb-83ab-000c29516958:1-3,
8c88da03-86be-11eb-ac3c-000c29aec9e2:1-10,
93f12623-86ce-11eb-9689-000c29aec9e2:1-67,
979a98c9-86ce-11eb-96b5-000c29eb57ff:1-55
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: master_2
           Master_TLS_Version: 
1 row in set (0.00 sec)

ERROR: 
No query specified

mysql> \q

如需在多源复制的基础上配置过滤复制，可参考下面配置

mysql> CHANGE REPLICATION FILTER REPLICATE_WILD_DO_TABLE = ('db1.%') FOR
CHANNEL "master_1";
mysql> CHANGE REPLICATION FILTER REPLICATE_WILD_DO_TABLE = ('db2.%') FOR
CHANNEL "master_2";