MYSQL双主架构搭建方法

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只是本人在搭建MYSQL主从服务器的笔记 ，不必定很好，高手能够飘过
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双主架构       	master A  <－－>   master B  
第一步；改配置文件 ->默认位置/etc/my.cnf
master的
［mysqld] 
log-bin=mysql-bin  # 开启二进制日志
server-id=2   #ID的区分，两台主机的ID要不同

slave的
 [mysqld]
 server-id=3

而后重启服务
第二步：受权

MySQL报错：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

解决办法：

mysql> set global read_only=0;
（关掉新主库的只读属性）

 flush privileges;
 

set global read_only=1;(读写属相)

 flush privileges;

 

master上受权,super和replication slave都是复制要用的权限
mysql> grant super,replication slave on *.* to 'jerry'@'10.1.1.7' identified by '123';
mysql> flush privileges;


mysql> show master status;	--只有打开二进制日志，这句命令才有结果，表示当前数据库的二进制日志写到什么位置
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      563 |              |                  |
+------------------+----------+--------------+------------------+


slave端的配置
mysql> slave stop;	--若是没有启过slave，这一步也是非必要的
Query OK, 0 rows affected, 1 warning (0.00 sec)


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

//此处为从的设置：须要master先受权
mysql> change master to
    -> master_user='jerry',
    -> master_password='123',
    -> master_host='10.1.1.6',		--主的IP
    -> master_port=3306,			--端口，若是为3307就要换成3307
    -> master_log_file='mysql-bin.000001',	--主上面查到的文件名
    -> master_log_pos=563;			--主上面查到的位置号
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   --这里两个YES，表示两个线程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 为NO，多为受权或者防火墙设置的问题。此处通常为SQL链接问题所至
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以上为一主一从的设置方法，若是要设置双主，就是所主从的关系变下，更新再设置一遍就是又主
注意点：
    1. 受权记得要清下权限 flush privileags;
    2. 记得防火墙的设置，主从服务器要PING得通
    3. selinux  （这个，我常常会忘记这块的设置）
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