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Mysql 5.6主从同步配置与解决方案

主库IP:192.168.1.10

从库IP:192.168.1.11

1、主库配置编辑my.cnf:

# 启用二进制日志log_bin = mysql-binserver-id = 111log-bin-index=mysql-bin.indexsync_binlog=1binlog_format=mixedbinlog-do-db = testdb //同步数据库binlog-ignore-db = mysqlbinlog-ignore-db = performance_schemabinlog-ignore-db = information_schemabinlog_checksum=NONE

2、创建同步账号

mysql> grant replication slave on *.* to slave@192.168.1.11 identified by 123456 

3、主库状态

mysql> flush privileges;mysql> show master status;+------------------+----------+--------------+------------------+| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |+------------------+----------+--------------+------------------+| mysql-bin.000008 |      337 |              |                  |+------------------+----------+--------------+------------------+

记录下二进制日志文件名和位置

4、从库配置文件配置

 

# [必须]启用二进制日志log-bin=mysql-bin   # [必须]服务器唯一ID,默认是1,一般取IP最后一段server-id=222relay-log-index = slave-relay-bin.indexrelay-log = slave-relay-binsync_master_info = 1sync_relay_log = 1sync_relay_log_info = 1

 

5、配置连接主库

mysql> change master to master_host=192.168.1.10,master_user=slave,master_password=123456, master_log_file=mysql-bin.000008,master_log_pos=337;

6、开始同步

mysql> start slave;mysql> show slave status\G;

7、正常状态

Slave_IO_Running: YesSlave_SQL_Running: Yes

8、解决主从不同步

先上Master库:

mysql>show processlist;   查看下进程是否Sleep太多。发现很正常。

show master status; 也正常。

mysql> show master status;
+-------------------+----------+--------------+-------------------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB              |
+-------------------+----------+--------------+-------------------------------+
| mysqld-bin.000001 |     3260 |              | mysql,test,information_schema |
+-------------------+----------+--------------+-------------------------------+
1 row in set (0.00 sec)

再到Slave上查看

mysql> show slave status\G                                                

Slave_IO_Running: Yes

Slave_SQL_Running: No

可见是Slave不同步

下面介绍两种解决方法:

方法一:忽略错误后,继续同步

该方法适用于主从库数据相差不大,或者要求数据可以不完全统一的情况,数据要求不严格的情况

解决: 

stop slave;

#表示跳过一步错误,后面的数字可变

set global sql_slave_skip_counter =1;

start slave;

之后再用mysql> show slave status\G  查看:

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

ok,现在主从同步状态正常

方式二:重新做主从,完全同步

该方法适用于主从库数据相差较大,或者要求数据完全统一的情况

解决步骤如下:

1.先进入主库,进行锁表,防止数据写入

使用命令:

mysql> flush tables with read lock;

注意:该处是锁定为只读状态,语句不区分大小写

2.进行数据备份 

#把数据备份到mysql.bak.sql文件

[root@server01 mysql]#mysqldump -uroot -p -hlocalhost > mysql.bak.sql

这里注意一点:数据库备份一定要定期进行,确保数据万无一失

3.查看master 状态

mysql> show master status;
+-------------------+----------+--------------+-------------------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB              |
+-------------------+----------+--------------+-------------------------------+
| mysqld-bin.000001 |     3260 |              | mysql,test,information_schema |
+-------------------+----------+--------------+-------------------------------+
1 row in set (0.00 sec)

4.把mysql备份文件传到从库机器,进行数据恢复

#使用scp命令

[root@server01 mysql]# scp mysql.bak.sql root@192.168.128.11:/tmp/

5.停止从库的状态

mysql> stop slave;

6.然后到从库执行mysql命令,导入数据备份

mysql> source /tmp/mysql.bak.sql

7.设置从库同步,注意该处的同步点,就是主库show master status信息里的| File| Position两项

change master to master_host = ‘192.168.128.10‘, master_user = ‘slave‘, master_port=3306, master_password=‘123456‘, master_log_file = ‘mysqld-bin.000001‘, master_log_pos=3260;

8.重新开启从同步

mysql> start slave;

9.查看同步状态

mysql> show slave status\G  查看:

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

 

Mysql 5.6主从同步配置与解决方案