MYSQL雙主架構搭建方法

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只是本人在搭建MYSQL主從服務器的筆記 ，不必定很好，高手能夠飄過
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雙主架構       	master A  <－－>   master B  
第一步；改配置文件 ->默認位置/etc/my.cnf
master的
［mysqld] 
log-bin=mysql-bin  # 開啓二進制日誌
server-id=2   #ID的區分，兩臺主機的ID要不同

slave的
 [mysqld]
 server-id=3

而後重啓服務
第二步：受權

MySQL報錯：The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

解決辦法：

mysql> set global read_only=0;
（關掉新主庫的只讀屬性）

 flush privileges;
 

set global read_only=1;(讀寫屬相)

 flush privileges;

 

master上受權,super和replication slave都是複製要用的權限
mysql> grant super,replication slave on *.* to 'jerry'@'10.1.1.7' identified by '123';
mysql> flush privileges;


mysql> show master status;	--只有打開二進制日誌，這句命令纔有結果，表示當前數據庫的二進制日誌寫到什麼位置
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      563 |              |                  |
+------------------+----------+--------------+------------------+


slave端的配置
mysql> slave stop;	--若是沒有啓過slave，這一步也是非必要的
Query OK, 0 rows affected, 1 warning (0.00 sec)


mysql> show warnings;	
+-------+------+--------------------------------+
| Level | Code | Message                        |
+-------+------+--------------------------------+
| Note  | 1255 | Slave already has been stopped | 
+-------+------+--------------------------------+

//此處爲從的設置：須要master先受權
mysql> change master to
    -> master_user='jerry',
    -> master_password='123',
    -> master_host='10.1.1.6',		--主的IP
    -> master_port=3306,			--端口，若是爲3307就要換成3307
    -> master_log_file='mysql-bin.000001',	--主上面查到的文件名
    -> master_log_pos=563;			--主上面查到的位置號
change master to master_user='jerry',master_password='123',master_host='10.1.1.6',master_port=3306,master_log_file='mysql-bin.000001',master_log_pos=563;
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)


mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.1.1.6
                  Master_User: li
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 563
               Relay_Log_File: mysql55-relay-bin.000002
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000001
              Slave_IO_Running: Yes
            Slave_SQL_Running: Yes   --這裏兩個YES，表示兩個線程OK
              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: 563
              Relay_Log_Space: 411
              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)

...................................

***** Slave_IO_Running 爲NO，多爲受權或者防火牆設置的問題。此處通常爲SQL鏈接問題所至
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以上爲一主一從的設置方法，若是要設置雙主，就是所主從的關係變下，更新再設置一遍就是又主
注意點：
    1. 受權記得要清下權限 flush privileags;
    2. 記得防火牆的設置，主從服務器要PING得通
    3. selinux  （這個，我常常會忘記這塊的設置）
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