MySQL主从复制问题解决一例

唐伯虎

　　这是mysql关于主从复制的主库的配置相关内容：

server-id     = 1  
log-bin=/mysql_log/binlog/bin-log  
slave-skip-errors=1062,1205  
max_binlog_size = 500M  
binlog_cache_size = 128K  
relay-log =/mysql_log/relaylog/relaylog  
log-slave-updates

　　之前搭建的MySQL主从复制出现问题，不能正常同步，查看日志，发下有以下错误：

120726 13:20:36 Could not use /mysql_log/relaylog/relaylog for logging (error 2). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it.  
120726 13:20:36 Failed in open_log() called from init_relay_log_info()  
120726 13:20:36 Failed to initialize the master info structure  
120726 13:20:36 Could not use /mysql_log/binlog/bin-log for logging (error 2). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it.  
 
 
120801 17:53:00 Failed to open the relay log '/mysql_log/relaylog/relaylog.036' (relay_log_pos 4)  
120801 17:53:00 Could not find target log during relay log initialization  
120801 17:53:00 Failed to initialize the master info structure

　　1、关闭mysql

[root@111_ddb ~]# mysqladmin -p shutdown  
Enter password:  
 
[root@111_ddb data]# tail -f /home/mysql/data/111_ddb.err  
120801 17:56:57 /usr/local/mysql/libexec/mysqld: Normal shutdown  
 
120801 17:56:58  InnoDB: Starting shutdown...  
120801 17:57:30  InnoDB: Shutdown completed  
120801 17:57:30 /usr/local/mysql/libexec/mysqld: Shutdown Complete  
 
120801 17:57:30  mysqld ended

　　2、删除主库上关于binlog日志的记录文件，msater.info 和 relay-log.info

[root@111_ddb ~]# cd /home/mysql/data/  
[root@111_ddb data]# ls  
111_ddb.err  111_ddb-slow.log  ddb           ibdata1    ib_logfile1  master.info  mysql_dd    slow.log  test  
111_ddb.pid  adb         ib_arch_log_0000000000  ib_logfile0  ib_logfile2  mysql    relay-log.info  tdb  
[root@111_ddb data]# ls *info  
master.info  relay-log.info  
[root@111_ddb data]# ls  
111_ddb.err  111_ddb-slow.log  ddb           ibdata1    ib_logfile1  master.info  mysql_dd    slow.log  test  
111_ddb.pid  adb         ib_arch_log_0000000000  ib_logfile0  ib_logfile2  mysql    relay-log.info  tdb  
[root@111_ddb data]# rm -f master.info relay-log.info   
[root@111_ddb data]# cd /mysql_log/binlog/  
[root@111_ddb binlog]# ls  
bin-log.001  bin-log.index 
[root@111_ddb binlog]# rm -f *  
[root@111_ddb binlog]# cd ../relaylog/  
[root@111_ddb relaylog]# ls  
relaylog.001  relaylog.index 
[root@111_ddb relaylog]# rm -f *  
[root@111_ddb relaylog]# cd ../binlog/

　　3、开启mysql

[root@111_ddb ~]# /usr/local/mysql/bin/mysqld_safe --defaults-file=/usr/local/mysql/etc/innodb.cnf --datadir=/home/mysql/data --user=mysql &  
 
[root@111_ddb data]# tail -f /home/mysql/data/111_ddb.err  
 
120801 17:58:21  mysqld started  
120801 17:58:23  InnoDB: Started  
/usr/local/mysql/libexec/mysqld: ready for connections.  
Version: '4.0.26-log'  socket: '/tmp/mysql.sock'  port: 3306  Source distribution  
 
[root@111_ddb binlog]# ll  
total 13080  
-rw-rw---- 1 mysql mysql 13365795 Aug  1 17:59 bin-log.001  
-rw-rw---- 1 mysql mysql     30 Aug  1 17:58 bin-log.index  
[root@111_ddb binlog]# ll  
total 13828  
-rw-rw---- 1 mysql mysql 14132046 Aug  1 17:59 bin-log.001  
-rw-rw---- 1 mysql mysql     30 Aug  1 17:58 bin-log.index  
[root@111_ddb binlog]# ll  
total 15020  
-rw-rw---- 1 mysql mysql 15355877 Aug  1 17:59 bin-log.001  
-rw-rw---- 1 mysql mysql     30 Aug  1 17:58 bin-log.index

　　通过日志和查看binlog文件，说明主库的配置恢复正常