Master slave 复制错误

Description：

Slave_IO_Running:NO

Slave_SQL_Running:Yes

Seconds_Behind_Master: NULL

本人遇到的Slave_IO_Running:NO的情况有下面两种：

1. 在配置slave同步时因为slave访问master没有权限导致；

2. master上的mysql-bin.xxxxxx文件全被我误删除了；

对于第一种情况，仔细检查数据库访问权限即可解决；

对于第二种情况，下面稍微详细介绍一下：

mysql> show slave status\G

*************************** 1. row ***************************

            Slave_IO_State:

               Master_Host: 192.168.3.21

               Master_User: slave

               Master_Port: 3307

             Connect_Retry: 60

           Master_Log_File: mysql-bin.000016

       Read_Master_Log_Pos: 173

            Relay_Log_File: mysqld-relay-bin.000008

             Relay_Log_Pos: 98

     Relay_Master_Log_File: mysql-bin.000016

          Slave_IO_Running: No

         Slave_SQL_Running: Yes

           Replicate_Do_DB:

       Replicate_Ignore_DB:

        Replicate_Do_Table:

    Replicate_Ignore_Table: br>                 Last_Errno: 0

                Last_Error:

              Skip_Counter: 0

       Exec_Master_Log_Pos: 173

           Relay_Log_Space: 98

           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

1 row in set (0.00 sec)

[root@slave mysql]# tail /var/log/mysqld.log

081223 15:51:50  InnoDB: Started; log sequence number 0 43655

081223 15:51:51 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when

this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-

log=/var/run/mysqld/mysqld-relay-bin' to avoid this problem.

081223 15:51:51 [Note] /usr/libexec/mysqld: ready for connections.

Version: '5.0.45-log'  socket: '/var/lib/mysql/mysql.sock'  port: 3307  Source distribution

081223 15:51:51 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000016' at

position 173, relay log '/var/run/mysqld/mysqld-relay-bin.000007' position: 98

081223 15:51:51 [Note] Slave I/O thread: connected to master

slave@192.168.3.21:3307''>'slave@192.168.3.21:3307'

,  replication started

in log 'mysql-bin.000016' at position 173

081223 15:51:51 [ERROR] Error reading packet from server: Could not find first log file name in binary log

index file ( server_errno=1236)

081223 15:51:51 [ERROR] Got fatal error 1236: 'Could not find first log file name in binary log index file'

from master when reading data from binary log

081223 15:51:51 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000016', position 173

081223 15:51:58 [Note] Error reading relay log event: slave SQL thread was killed

解决步骤：

重启master库：service mysqld restart

mysql> show master status;

+------------------+----------+--------------+------------------+

| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |

+------------------+----------+--------------+------------------+

| mysql-bin.000001 |       98 |              |                  |

+------------------+----------+--------------+------------------+

mysql> slave stop;

mysql> change master to Master_Log_File='mysql-bin.000001',Master_Log_Pos=98;

mysql> slave start;

mysql> show slave status\G

*************************** 1. row ***************************

            Slave_IO_State: Waiting for master to send event

               Master_Host: 192.168.3.21

               Master_User: slave

               Master_Port: 3307

             Connect_Retry: 60

           Master_Log_File: mysql-bin.000001

       Read_Master_Log_Pos: 98

            Relay_Log_File: mysqld-relay-bin.000002

             Relay_Log_Pos: 235

     Relay_Master_Log_File: mysql-bin.000001

          Slave_IO_Running: Yes

         Slave_SQL_Running: Yes

           Replicate_Do_DB:

   Replicate_Wild_Do_Table:

Replicate_Wild_Ignore_Table:

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: 98

           Relay_Log_Space: 235

           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

1 row in set (0.00 sec)