MYSQL主从复制配置遇到的问题

在进行配置从服务器时遇到的错误。

mysql> change master to master_host='192.168.136.129',master_user='repl',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=2610;

ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MySQL error log

查看日志

[root@slave mysql]# ls -a

.        ib_logfile0  relay-log.info          slave-relay-bin.000002  slave-relay-bin.000006  slave-relay-bin.000010  slave-relay-bin.000014

..       ib_logfile1  slave.err               slave-relay-bin.000003  slave-relay-bin.000007  slave-relay-bin.000011  slave-relay-bin.index

discuz   master.info  slave.pid               slave-relay-bin.000004  slave-relay-bin.000008  slave-relay-bin.000012  test

ibdata1  mysql        slave-relay-bin.000001  slave-relay-bin.000005  slave-relay-bin.000009  slave-relay-bin.000013

[root@slave etc]# tail /data/mysql/slave.err 

Version: '5.1.40'  socket: '/tmp/mysql.sock'  port: 3306  MySQL Community Server (GPL)

141103 15:42:29 mysqld_safe A mysqld process already exists

141103 16:48:32 [ERROR] Failed to open the relay log './localhost-relay-bin.000001' (relay_log_pos 4)

141103 16:48:32 [ERROR] Could not find target log during relay log initialization

141103 16:49:51 [ERROR] Failed to open the relay log './localhost-relay-bin.000001' (relay_log_pos 4)

141103 16:49:51 [ERROR] Could not find target log during relay log initialization

141103 16:49:52 [ERROR] Failed to open the relay log './localhost-relay-bin.000001' (relay_log_pos 4)

141103 16:49:52 [ERROR] Could not find target log during relay log initialization

141103 16:49:53 [ERROR] Failed to open the relay log './localhost-relay-bin.000001' (relay_log_pos 4)

141103 16:49:53 [ERROR] Could not find target log during relay log initialization

解决：

由于之前配置过，生成了一些*relay*，使得再次配置无法生成，删除掉之前生成的文件就可以。

[root@slave mysql]# rm *bin*

rm：是否删除 一般文件 “slave-relay-bin.000001”? y

rm：是否删除 一般文件 “slave-relay-bin.000002”? y

rm：是否删除 一般文件 “slave-relay-bin.000003”? y

rm：是否删除 一般文件 “slave-relay-bin.000004”? y

rm：是否删除 一般文件 “slave-relay-bin.000005”? y

rm：是否删除 一般文件 “slave-relay-bin.000006”? y

rm：是否删除 一般文件 “slave-relay-bin.000007”? y

rm：是否删除 一般文件 “slave-relay-bin.000008”? y

rm：是否删除 一般文件 “slave-relay-bin.000009”? y

rm：是否删除 一般文件 “slave-relay-bin.000010”? y

rm：是否删除 一般文件 “slave-relay-bin.000011”? y

rm：是否删除 一般文件 “slave-relay-bin.000012”? y

rm：是否删除 一般文件 “slave-relay-bin.000013”? y

rm：是否删除 一般文件 “slave-relay-bin.000014”? y

rm：是否删除 一般文件 “slave-relay-bin.index”? y

[root@slave mysql]# ls -a

.  ..  discuz  ibdata1  ib_logfile0  ib_logfile1  master.info  mysql  relay-log.info  slave.err  slave.pid  test

[root@slave mysql]# rm relay-log.info 

rm：是否删除 一般文件 “relay-log.info”? y

[root@slave mysql]# rm master.info 

rm：是否删除 一般文件 “master.info”? y

[root@slave mysql]# ls -a

.  ..  discuz  ibdata1  ib_logfile0  ib_logfile1  mysql  slave.err  slave.pid  test

[root@slave mysql]# /usr/local/mysql/bin/mysql -uroot

Welcome to the MySQL monitor.  Commands end with ; or g.

Your MySQL connection id is 8

Server version: 5.1.40 MySQL Community Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> slave stop;

Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> change master to master_host='192.168.136.129',master_user='repl',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=2610;

Query OK, 0 rows affected (0.06 sec)

mysql> slave start;

Query OK, 0 rows affected (0.03 sec)

不再报错，配置成功！

另计，发现master.info 文件里面记录的是自己配置的选项。

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