MySQL 三節點複製

1.環境準備：
安裝好三台MYSQL伺服器。
A    192.168.1.8
B    192.168.1.88
C    192.168.1.188

環形結構：  192.168.1.8主     192.168.1.88從
         192.168.1.88主   192.168.1.188從
         192.168.1.188主  192.168.1.8從

2.更改設定檔/etc/my.cnf
增加以下內容：
log-bin=mysql-bin
slave-skip-errors=all
log-slave-updates
skip-name-resolve
在設定檔中修改： server-id    分別是  server-id=1  2  3

3.重啟三個節點的MYSQL。
/home/mysql/mysql/support-files/mysql.server restart

4.添加複製使用者。在每個節點都如此操作。
 grant replication slave on *.* to 'replication'@'%' identified by 'replication';

 grant all privileges on *.* to replication@'%' identified by 'replication';

4.配置複製進程：
（1） 192.168.1.8主  192.168.1.88從配置
A節點：show master status
    -> ;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |      107 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
B節點：
CHANGE MASTER TO MASTER_HOST='192.168.1.8',MASTER_PORT=3306,MASTER_USER='replication',MASTER_PASSWORD='replication',MASTER_LOG_FILE='mysql-bin.000006',MASTER_LOG_POS=107;

start slave;

show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.88
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000006
          Read_Master_Log_Pos: 107
               Relay_Log_File: localhost-relay-bin.000015
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000006
             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: 107
              Relay_Log_Space: 559
              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)

（2）192.168.1.88主  192.168.1.188從配置
B節點：show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |      107 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

C節點配置：
CHANGE MASTER TO MASTER_HOST='192.168.1.8',MASTER_PORT=3306,MASTER_USER='replication',MASTER_PASSWORD='replication',MASTER_LOG_FILE='mysql-bin.000006',MASTER_LOG_POS=107;

start slave;

show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.88
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000006
          Read_Master_Log_Pos: 107
               Relay_Log_File: localhost-relay-bin.000017
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000006
             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: 107
              Relay_Log_Space: 559
              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)

(3)192.168.1.188主  192.168.1.8從配置
C節點：show master status
    -> ;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 |      107 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

A節點配置：
CHANGE MASTER TO MASTER_HOST='192.168.1.8',MASTER_PORT=3306,MASTER_USER='replication',MASTER_PASSWORD='replication',MASTER_LOG_FILE='mysql-bin.000005',MASTER_LOG_POS=107;

start slave;

show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.88
                  Master_User: replication
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000006
          Read_Master_Log_Pos: 107
               Relay_Log_File: localhost-relay-bin.000015
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000006
             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: 107
              Relay_Log_Space: 559
              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)

驗證：
只要表結構一樣，引擎不一樣也是可以同步的。
引擎也可以同步，就是你改動第二節點的引擎，第一節點也是會同步成相同的引擎的。