艾瑞克黑白講

MySQL Master Master Replication 顧名思義就是兩台MySQL DB server都是Master Role

意指 : 資料的寫入無論在哪一台DB server都能夠同步到另一台

環境架構 : CentOS 7 + MariaDB 5.5

Master 1 IP : 192.168.10.147  

Master 2 IP : 192.168.10.41

※ 在Master 1主機下

1. 編輯 /etc/my.cnf，加入以下，然後重啟MariaDB

log-bin=mysql-bin
server_id=1

systemctl restart mariadb

2. 建立同步user account和權限

# mysql -uroot -p
MariaDB [(none)]> CREATE USER 'rep'@'%' IDENTIFIED BY '2wsx#EDC';
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'rep'@'%';
MariaDB [(none)]> flush privileges;

3. 查看目前Binlog狀態，並記錄一下

MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      334 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

 ※ 在Master 2主機下

1. 編輯 /etc/my.cnf，加入以下，然後重啟MariaDB

server_id=2
log-bin=mysql-bin

systemctl restart mariadb

2. 建立同步user account和權限

# mysql -uroot -p
MariaDB [(none)]> CREATE USER 'rep'@'%' IDENTIFIED BY '2wsx#EDC';
MariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'rep'@'%';
MariaDB [(none)]> flush privileges;

3. 啟用Master2同步

MariaDB [(none)]> stop slave;
-> change master to master_host = '192.168.10.147' , 
-> master_user = 'rep' , master_password = '2wsx#EDC' ,
-> master_log_file = 'mysql-bin.000001' ,  master_log_pos = 334;
Query OK, 0 rows affected (0.04 sec)
MariaDB [(none)]> start slave;

4. 查看是否啟用同步

MariaDB [(none)]> show slave status\G ;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.10.147
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 334
               Relay_Log_File: mariadb-relay-bin.000004
                Relay_Log_Pos: 618
        Relay_Master_Log_File: mysql-bin.000001
             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: 334
              Relay_Log_Space: 914
              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: 1
1 row in set (0.00 sec)

5. 查看目前Binlog狀態，並記錄一下

MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      332 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

※ 在Master 1主機下

1. 啟用同步

MariaDB [(none)]> stop slave;
change master to master_host = '192.168.10.41' ,
-> master_user = 'rep' , master_password = '2wsx#EDC' ,
-> master_log_file = 'mysql-bin.000001' ,  master_log_pos = 332;
Query OK, 0 rows affected (0.04 sec)
MariaDB [(none)]> start slave;

2. 查看同步狀態

MariaDB [(none)]> show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.10.41
                  Master_User: rep
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 332
               Relay_Log_File: mariadb-relay-bin.000002
                Relay_Log_Pos: 616
        Relay_Master_Log_File: mysql-bin.000001
             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: 332
              Relay_Log_Space: 912
              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: 2
1 row in set (0.00 sec)

最後測試一下

在Master 1上新增DB，看看Master 2會不會也建立

在Master 2上刪除DB，看看Master 1會不會也刪除