mysql5.6数据库同步,单向双向同步问题
windows下MySQL5.6实现主从数据库同步数据
mysql5.6数据库同步,单向双向同步问题
一.单向同步
主数据库(mysql5.6)192.168.1.104
从数据库(mysql5.6)192.168.1.105
略去创建库的步骤,这里认为你同步的数据库已经存在,而且主从数据库的库和表结构均相同
1.在主数据库上创建用户
insert into mysql.user(host,user,password)
values('localhost','admin',password('123456'));
flush privileges;
2.主数据库提供用户,赋值访问权限
仅仅192.168.1.105这个机器使用admin/123456同步
grant replication slave,reload,super on *.* to 'admin'@'192.168.1.105' identified by '123456' with grant option;
所有人都只用admin/123456同步
grant replication slave,reload,super on *.* to 'admin'@'%' identified by '123456' with grant option;
3.修改104主数据库的my.ini
在[mysqld]节点下配置一下代码
#设置服务器id,为1表示主服务器,注意:如果原来的配置文件中已经有这一行,就不用再添加了。
server_id=1
log_bin=mysql-bin #启动MySQ二进制日志系统,注意:如果原来的配置文件中已经有这一行,就不用再添加了。
binlog_do_db=test #需要同步的数据库名,如果有多个数据库,可重复此参数,每个数据库一行
binlog_ignore_db=mysql #不同步mysql系统数据库
binlog_ignore_db=information_schema #不同步information_schema系统数据库
然后保存my.ini配置文件
管理员打开cmd
先停止mysql服务,net stop mysql
然后重启mysql服务,net start mysql
服务启动成功后,登陆mysql
mysql -u root -p123456 注意,-p和123456之间不用空格
在查看主数据库的状态,show master status\G;
+------------------+----------+--------------+------------------+
|
File |
Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 120 | test |
mysql |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
注意:这里记住File的值:mysql-bin.000001和Position的值:120,后面会用到。
4.修改105从数据库的my.ini文件
server_id=2
log_bin=mysql-bin
replicate_do_db=test
replicate_ignore_db=mysql
replicate_ignore_db=information_schema
保存my.ini
然后停止mysql服务,net stop mysql
在启动mysql服务,net start mysql
然后进入mysql -u root -p123456
先停止从数据库同步,stop slave,
再输入:change master to master_host='192.168.1.104',master_user='admin',master_password='123456',master_log_file='mysql-bin.000001',master_log_pos=120; #执行同步语句
开启同步,start slave
注:经测试,stop slave ,start slave 和 slave start,slave stop一样都可以,
最后查看一下状态:show slave status;
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.104
Master_User: test01
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 120
Relay_Log_File: mysql-bin.000001
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: mysql,information_schema
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: 120
Relay_Log_Space: 465
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
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: f44dc946-f462-11e4-81cc-00ffb613a054
Master_Info_File: D:\GreenProgramFiles\MySQL Server 5.6\data\master
.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the sla
ve I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
注:Slave_IO_Running: Yes
Slave_SQL_Running: Yes
这两个都是yes的时候同步才会成功发生,否则不能实现同步
5.最后在主数据库上执行插入,更改,删除语句,在从数据库上查看,数据保持一致了,
二.双向同步
在上述配置保持不变的情况下,各自增加主从配置项
104:主数据库已经配置完毕,需要配置从数据库
log_bin=mysql-bin
replicate_do_db=test
replicate_ignore_db=mysql
replicate_ignore_db=information_schema
重启mysql,登陆后输入:
stop slave;
change master to master_host='192.168.1.105',master_user='admin',master_password='123456',master_log_file='mysql-bin.0000001',master_log_pos=120;
# master_log_file='mysql-bin.0000001',master_log_pos=120;
其中这两个参数是根据master主数据库的二进制日志文件和为止固定的
start slave;
show slave status\G;
105:从数据库已经配置完毕,需要配置主数据库
log_bin=mysql-bin
binlog_do_db=test
binlog_ignore_db=mysql
binlog_ignore_db=information_schema
重启mysql,登陆输入:
flush tables with read lock;
show master status\G;得到主数据库的信息
根据这这个命令的结果在跟新104主从数据库的同步日志和位置
mysql>change master to master_log_file='mysql-bin.00002',master_log_pos=120;
同时要为用户开放权限
仅仅192.168.1.105这个机器使用admin/123456同步
grant replication slave,reload,super on *.* to 'admin'@'192.168.1.105' identified by '123456' with grant option;
所有人都只用admin/123456同步
grant replication slave,reload,super on *.* to 'admin'@'%' identified by '123456' with grant option;
GRANT REPLICATION SLAVE ON *.* TO 'admin'@'%' IDENTIFIED BY '123456';
GRANT FILE,SELECT,REPLICATION SLAVE ON *.* TO 'admin'@'%' IDENTIFIED BY '123456';
最后配置完毕的结果
104: 主从数据库
#主数据库配置项
server_id=1
#auto_increment_increment=2
#auto_increment_offset=1
log_bin=mysql-bin
binlog_do_db=test
binlog_ignore_db=mysql
binlog_ignore_db=information_schema
#从数据库配置项
replicate_do_db= test #同步的数据库
replicate_ignore_db=mysql
replicate_ignore_db=information_schema
105:主从数据库
#从数据库配置项
server_id=2
#auto_increment_increment=2
#auto_increment_offset=1
log_bin=mysql-bin
replicate_do_db= test #同步的数据库
replicate_ignore_db=mysql
replicate_ignore_db=information_schema
#主数据库配置项
binlog_do_db=test
binlog_ignore_db=mysql
binlog_ignore_db=information_schema
遇到的问题总结:
1.经测试,主mysql5.6,从mysql5.5,不能实现同步,
Slave_IO_Running: No
Slave_SQL_Running: Yes
错误提示:Last_IO_Error: Got fatal error 1236 from master when reading data from binary log:
问题:一般版本不一致
2.
Slave_IO_Running: Yes
Slave_SQL_Running: No
3. Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for
replication to work.
mysql>show variables like ‘server_id';
+—————+——-+
| Variable_name | Value |
+—————+——-+
| server_id | 3 |
+—————+——-+
主从并不一样,排除该问题。
找到原因在于,拷贝整个data目录,把auto.cnf文件也拷贝过来了,里面记录了数据库的uuid,每个库的uuid应该是不一样的。
[auto]
server-uuid=6dcee5be-8cdb-11e2-9408-90e2ba2e2ea6
解决办法,按照这个16进制格式,随便改下,重启mysql即可。
4. 111010 17:35:49 [ERROR] Error reading packet from server: Client requested master
to start replication from impossible position ( server_errno=1236)
111010 17:35:49 [ERROR] Slave I/O: Got fatal error 1236 from master when reading data
from binary log: 'Client requested master to start replication from impossible
position', Error_code: 1236
111010 17:35:49 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000288',
position 627806304
解决方法:
mysql> stop slave;
mysql> change master to master_log_file='mysql-bin.000288',master_log_pos=627625751;
mysql> start slave;
5.在一台主机上配置一台从机,启动的时候报 ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the
repository(双向配置后,启动从机报错)
解决方法:配置relay_log=relay-,
然后再重新停止net stop mysql,
启动net start mysql,
登陆mysql -u root -p123456
运行reset slave
然后启动从机start slave