手把手教你MySQL主从复制,配置不成功你找我!(二)


4、重启MySQL服务,登录MySQL,查看主库信息


[root@localhost ~]# service mysqld restart #重启mysql服务
[root@localhost ~]# mysql -u root -p #登陆mysql
mysql> show master status; #查看master状态


显示大概如下内容


+------------------+----------+--------------+----------------------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+----------------------------------+-------------------+
| mysql-bin.000006 |    120 | ufind_db | information_schema,performance_schema,mysql | |
+------------------+----------+--------------+----------------------------------+-------------------+
1 row in set (0.00 sec)


:如果执行这个步骤始终为Empty set(0.00 sec)那说明前面的my.cnf没配置对,请回去重新检查配置步骤。



配置从(Slave)数据库

1、修改从库的数据库配置文件


[root@localhost ~]# vi /etc/my.cnf


将里面的内容修改为


#开启二进制日志
log-bin=mysql-bin
server-id=2
binlog-ignore-db=information_schema
binlog-ignore-db=performance_schema
binlog-ignore-db=mysql
#与主库配置保持一致
replicate-do-db=test
replicate-ignore-db=mysql
log-slave-updates
slave-skip-errors=all
slave-net-timeout=60


2、重启MySQL服务,登录MySQL


[root@localhost ~]# service mysqld restart
[root@localhost ~]# mysql -u root -p


并作如下修改:


#关闭Slave
mysql> stop slave; #设置连接主库信息
mysql> change master to master_host='192.168.0.1',master_user='root',master_password='root password',master_log_file='mysql-bin.000006', master_log_pos=120;
#开启Slave
mysql> start slave;


:上面的master_log_file是在配置Master的时候的File字段, master_log_pos是在配置Master的Position 字段。一定要一一对应

3、查看从库状态信息


mysql> show slave status \G;


成功的话会显示如下信息:


*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.1
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000006
          Read_Master_Log_Pos: 120
               Relay_Log_File: localhost-relay-bin.000006
                Relay_Log_Pos: 520
        Relay_Master_Log_File: mysql-bin.000006
             Slave_IO_Running: Yes //显示yes为成功
            Slave_SQL_Running: Yes //显示yes为成功,如果为no,一般为没有启动master
              Replicate_Do_DB: test
          Replicate_Ignore_DB: mysql//上面的都是配置文件中的信息
           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: 357
              Relay_Log_Space: 697
              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: //如果为no,此处会显示错误信息
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 2
                  Master_UUID: be0a41c0-2b40-11e8-b791-000c29267b6a
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
1 row in set (0.00 sec)
 
ERROR:
No query specified


:如果Slave_IO_Running: No并且出现下面的错误

Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work.

说明主服务器的UUID和从服务器的UUID重复,因为我是安装成功一台数据库后直接克隆的,所以他们的UUID是一样的,就会报这个错。可以修改一下从库的UUID即可。

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