MySQL1236错误的恢复
从库出现问题
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Master_Host: 192.168.220.141 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000005 I/O线程当前正在读取的主服务器二进制日志文件的名称 Read_Master_Log_Pos: 764 在当前的主服务器二进制日志中，I/O线程已经读取的位置 Relay_Log_File: relay-bin.000018 SQL线程当前正在读取和执行的中继日志文件的名称 Relay_Log_Pos: 4 在当前的中继日志中，SQL线程已读取和执行的位置 Relay_Master_Log_File: mysql-bin.000005 由SQL线程执行的包含多数近期事件的主服务器二进制日志文件的名称 Slave_IO_Running: No Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: mysql Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 最后的错误号，0表示没有错误 Last_Error: 最后错误的描述 Skip_Counter: 0 最近被使用的用于SQL_SLAVE_SKIP_COUNTER的值 Exec_Master_Log_Pos: 764 来自主服务器的二进制日志的由SQL线程执行的上一个时间的位置（Relay_Master_Log_File）。在主服务器的二进制日志中的(Relay_Master_Log_File,Exec_Master_Log_Pos)对应于在中继日志中的(Relay_Log_File,Relay_Log_Pos) Relay_Log_Space: 107 所有原有的中继日志结合起来的总大小 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: 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: 1 1 row in set (0.00 sec) ERROR: No query specified mysql>
查看mysql的错误日志
大致的意思就是说，从库不能读取主库的binlog日志文件了，造成这种故障的原因可能是：
- 从库不能连接主库
- 主库的binlog日志被删除了
.......
[root@mysql ~]# tail /data/3307/mysql.err //查看错误日志 151129 23:14:41 [Note] Slave SQL thread initialized, starting replication in log 'mysql-bin.000005' at position 764, relay log '/data/3307/relay-bin.000018' position: 4 151129 23:14:41 [ERROR] Error reading packet from server: Could not find first log file name in binary log index file ( server_errno=1236) 151129 23:14:41 [ERROR] Slave I/O: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file', Error_code: 1236 151129 23:14:41 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000005', position 764 [root@mysql 3307]# ping 192.168.220.141 //测试和主库的连通性 PING 192.168.220.141 (192.168.220.141) 56(84) bytes of data. 64 bytes from 192.168.220.141: icmp_seq=1 ttl=64 time=0.197 ms 64 bytes from 192.168.220.141: icmp_seq=2 ttl=64 time=0.029 ms 64 bytes from 192.168.220.141: icmp_seq=3 ttl=64 time=0.025 ms ^C --- 192.168.220.141 ping statistics ---
查看主库的日志
Slave I/O thread exiting, read up to log 'mysql-bin.000005', position 764提示读取mysql-bin.000005错误，查看主库的binlog日志后发现没有mysql-bin.0000005日志文件
这是因为长时间没有开启数据库，binlog的存活时间是7天，所以binlog00000005日志应该是被删除了
规定binlog日志存活时间的参数在my.cnf中
expire_logs_days = 7 //单位是天，0表示不自动删除
[root@mysql ~]# ll /data/3306/ total 36 drwxr-xr-x 5 mysql mysql 4096 Nov 29 23:08 data -rw-r--r-- 1 mysql mysql 1899 Oct 16 00:46 my.cnf -rwx------ 1 root root 1307 Oct 16 01:44 mysql -rw-rw---- 1 mysql mysql 107 Nov 29 23:08 mysql-bin.000006 -rw-rw---- 1 mysql mysql 28 Nov 29 23:08 mysql-bin.index srwxrwxrwx 1 mysql mysql 0 Nov 29 23:08 mysql.sock -rw-r----- 1 mysql root 10993 Nov 29 23:08 mysql_oldboy3306.err -rw-rw---- 1 mysql mysql 5 Nov 29 23:08 mysqld.pid [root@mysql ~]#
调整从库的同步位置：
change master to master_log_file='mysql-bin.000006',master_log_pos=4
mysql> stop slave; Query OK, 0 rows affected (0.00 sec) mysql> change master to master_log_file='mysql-bin.000006',master_log_pos=4; Query OK, 0 rows affected (0.32 sec) 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: 192.168.220.141 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000006 Read_Master_Log_Pos: 107 Relay_Log_File: relay-bin.000002 Relay_Log_Pos: 253 Relay_Master_Log_File: mysql-bin.000006 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: mysql 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: 403 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 //没有IO错误了 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) ERROR: No query specified mysql>
