error connecting to master 'repl@192.168.1.107:3306' - retry-time: 60 retries: 86400

很多时候，就算thread 正在进行，也不代表没有错误，一定要看看具体表示错误的变量

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: 192.168.1.107
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000045
Read_Master_Log_Pos: 107
Relay_Log_File: CENTOS6-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000045
Slave_IO_Running: Connecting
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: 107
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 1045
Last_IO_Error: error connecting to master 'repl@192.168.1.107:3306' - retry-time: 60 retries: 86400
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
row in set (0.00 sec)

一个变量可能承载不了那么多的错误信息，要看详细的错误信息就要看错误日志

160204 18:27:37 [Note] Error reading relay log event: slave SQL thread was killed
160204 18:27:37 [Note] Slave I/O thread killed while connecting to master
160204 18:27:37 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000045', position 107
160204 18:27:48 [Note] 'CHANGE MASTER TO executed'. Previous state master_host='centos7', master_port='3306', master_log_file='', master_log_pos='4'. New state master_host='192.168.1.107', master_port='3306', master_log_file='mysql-bin.000045', master_log_pos='107'.
160204 18:27:52 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000045' at position 107, relay log '/usr/local/mysql/data/CENTOS6-relay-bin.000001' position: 4
160204 18:27:52 [ERROR] Slave I/O: error connecting to master 'repl@192.168.1.107:3306' - retry-time: 60  retries: 86400, Error_code: 1045

不过也没有更多的信息，查一下错误代号

查询了一下master的登陆表

这句话的意思是，来自192.168.1.108这个地方的人，可以使用master机器上的一个叫做repl的账号，但是‘repl’@'192.168.1.108'这个账号可以做一些什么东西，不能做一些什么东西呢，这个需要看他的权限，也就是他的能力，因为可能不止一项权利，所以用了复数grants

可以看到它是没有经过授权的，我们现在可以对他授权，仅仅是一个“进行复制”的权利，授权完以后需要确认一下

 现在重新使用replication功能，其实不需要start slave去开启，它自己就会自动开启的

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.107
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000045
          Read_Master_Log_Pos: 3220
               Relay_Log_File: CENTOS6-relay-bin.000002
                Relay_Log_Pos: 3366
        Relay_Master_Log_File: mysql-bin.000045
             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: 3220
              Relay_Log_Space: 3524
              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: 1
1 row in set (0.00 sec)

原文来自https://www.cnblogs.com/hellotracy/articles/5183057.html