MySQL错误：Last_IO_Errno: 1236处理办法

环境信息：
        localhost102为主 localhost105为主的备。即是双主并采用keepalived的高可用的结构。
        问题：由于误删了localhost105上的所有的binlog日志文件和索引文件。然后停机，再重启了。没有以前的索引文件和binlog文件。
        状态：localhost102为主 ，localhost105为主的备  192.168.1.208为VIP
        查看localhost102的状态时，报找不到localhost105以前的索引文件和binlog文件。
解决办法是：先让localhost105成为主，然后localhost102重新使用change master to语句，开始新的复制。
[MySQL@localhost102 softwares]# mysql -uroot -p -P3306
mysql> show master status\G
*************************** 1. row ***************************
             File: mysql_bin.000009
         Position: 154
     Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 
1 row in set (0.00 sec)
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 192.168.0.105
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql_bin.000007
          Read_Master_Log_Pos: 3857
               Relay_Log_File: localhost102-relay-bin.000016
                Relay_Log_Pos: 4023
        Relay_Master_Log_File: mysql_bin.000007
             Slave_IO_Running: No
            Slave_SQL_Running: Yes
                Last_IO_Errno: 1236
                Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 11
                  Master_UUID: 1ea5f3d8-7776-11e7-ba21-000c2930cce4
             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 more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 170805 09:29:38




解决办法：
停localhost102的keepalived，让localhost105成为主。
[root@localhost102 ~]# ps -ef | grep kee
root     17719     1  0 07:14 ?        00:00:02 /opt/keepalived-1.2.20/bin/keepalived -f /usr/local/keepalived/etc/keepalived/keepalived.conf
root     17721 17719  0 07:14 ?        00:00:05 /opt/keepalived-1.2.20/bin/keepalived -f /usr/local/keepalived/etc/keepalived/keepalived.conf
root     18202 17719  0 10:11 ?        00:00:00 /opt/keepalived-1.2.20/bin/keepalived -f /usr/local/keepalived/etc/keepalived/keepalived.conf
[root@localhost102 ~]#kill  17719 
[root@localhost102 ~]#kill   17721
[root@localhost102 ~]#kill   18202


这是检测localhost105是否是主：即使用VIP 192.168.1.208是否可以连接localhost105的MySQL服务。可以的话，就是主了。也可以看keepalived的日志信息
[mysql@localhost105 ~]$ mysql -uroot -p -h192.168.1.208 -P3306
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1233
Server version: 5.7.18-log MySQL Community Server (GPL)
锁库，然后看状态
mysql> flush tables with  read lock;
Query OK, 0 rows affected (0.01 sec)


mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql_bin.000002 |      154 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)


mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)


现在在localhost102上进行change master to操作
[root@localhost102 ~]# mysql -uroot -p -P3306
mysql> change master to master_host='192.168.0.105' master_user='repl',master_password ='123456',
         master_log_file ='mysql_bin.000002' master_log_pos=154;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near 'master_user='repl',master_password ='123456', 
master_log_file ='mysql_bin.000002' at line 1
报错：由于漏了写二个，号。
解决办法：
停slave之前，一定要看状态是否已经把 relay log文件应用完成了，没有完成的话，不要停slave。
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
mysql> stop slave;
mysql> change master to master_host='192.168.0.105'， master_user='repl',master_password ='123456',
         master_log_file ='mysql_bin.000002'， master_log_pos=154;
Query OK, 0 rows affected, 2 warnings (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.03 sec)


mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.105
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql_bin.000002
          Read_Master_Log_Pos: 154
               Relay_Log_File: localhost102-relay-bin.000002
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql_bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 154
              Relay_Log_Space: 534
              Until_Condition: None
               Until_Log_File: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 11
                  Master_UUID: 1ea5f3d8-7776-11e7-ba21-000c2930cce4
             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 more updates
           Master_Retry_Count: 86400
 现在localhost102已经开始读取localhost105的新binlog日志文件和索引文件了。恢复完成！然后可以测试一下双主的功能！