Linux Ubuntu MySql5.6主从配置及问题解决

虚拟机装的是MySql5.6，复制实例后出现  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错误 ；要解决此问题网上很多说的是修改/data/atuo.cnf文件重置server-uuid，不过笔者找了半天都没找到此文件（find -name  auto.cnf或者 whereis auto.cnf），Mysql官方文档讲述的是此文件不可修改也不可手动创建，所以使用mysql5.6做主从备份的朋友需要注意了，这个版本的复制或克隆会有问题，必须卸载干净才能重装，否则问题会重现浪费许多时间。

本人使用的VMware workstation10（Oracle VirtualBox也可）镜像是Ubuntu-server-15.04，本文所讲问题是Mysql版本UUID的标识导致的。

Mysql主从配置请参考：https://dev.mysql.com/doc/refman/5.5/en/replication-howto.html

Mysql的安装请参考：http://blog.csdn.net/boonya/article/details/53908033

卸载Mysql

执行以下命令卸载Mysql：

sudo apt-get autoremove mysql-server mysql-client

卸载不能完全需要删除残余：

sudo find /etc -name "*mysql*" |xargs  rm -rf 

如果不能删除，查询那些路径：

sudo find /etc -name "*mysql*" |xargs 

使用chmod获取路径权限：

chmod 777 /etc

如果还是不行强制删除：

sudo rm /var/lib/mysql/ -Rsudo rm /etc/mysql/ -Rsudo apt-get autoremove mysql* --purgesudo apt-get remove apparmor

注：有三个文件删不掉不影响，执行以下命令进验证

dpkg -l | grep mysql # 若没有返回，说明已完成卸载.

Master主配置

IP:192.168.178.128

修改mysql配置：sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

server-id=1log-bin=mysql-bin

修改后重启mysql：

sodu /etc/init.d/mysql restart

此时Slave无法访问Master需要在Master（mysql）窗口为Slave赋予权限：

grant all privileges on *.* to 'root'@'192.168.178.129' identified by '123456'; flush privileges; 

查看Master状态：

mysql> show master status;+------------------+----------+--------------+------------------+-------------------+| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+------------------+----------+--------------+------------------+-------------------+| mysql-bin.000001 |      620 |              |                  |                   |+------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)mysql> 

Slave从配置

IP:192.168.178.129

修改mysql配置：sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

server-id=2

修改后重启mysql：

sodu /etc/init.d/mysql restart

进入mysql命令行，mysql -u root -p 输入密码进入，并执行以下 命令：

stop slave;change master to master_host='192.168.178.128', master_user='root', master_password='123456', master_log_file='mysql-bin.000001', master_log_pos=620;start slave;

查看Slave状态：

show slave status;

格式化显示Slave状态：

show slave status\G;

如果看到如下输出标识主从配置完成：

mysql> show slave status\G;*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: 192.168.178.128                  Master_User: root                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: mysql-bin.000001          Read_Master_Log_Pos: 620               Relay_Log_File: mysqld-relay-bin.000002                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:           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: 620              Relay_Log_Space: 457              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: 0Master_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: 544196d6-ccc3-11e6-8a15-000c29fc7ee8             Master_Info_File: /var/lib/mysql/master.info                    SQL_Delay: 0          SQL_Remaining_Delay: NULL      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave 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: 01 row in set (0.00 sec)ERROR:No query specifiedmysql> 

主要是 Slave_IO_Running: Yes
            Slave_SQL_Running: Yes  标识成功！！！！

否则看到：

mysql> show slave status\G;*************************** 1. row ***************************               Slave_IO_State:                  Master_Host: 192.168.178.128                  Master_User: root                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: mysql-bin.000001          Read_Master_Log_Pos: 620               Relay_Log_File: mysqld-relay-bin.000001                Relay_Log_Pos: 4        Relay_Master_Log_File: mysql-bin.000001             Slave_IO_Running: No            Slave_SQL_Running: Yes              Replicate_Do_DB:          Replicate_Ignore_DB:           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: 620              Relay_Log_Space: 120              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: NULLMaster_SSL_Verify_Server_Cert: No                Last_IO_Errno: 1593                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.               Last_SQL_Errno: 0               Last_SQL_Error:  Replicate_Ignore_Server_Ids:             Master_Server_Id: 1                  Master_UUID:             Master_Info_File: /var/lib/mysql/master.info                    SQL_Delay: 0          SQL_Remaining_Delay: NULL      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it           Master_Retry_Count: 86400                  Master_Bind:      Last_IO_Error_Timestamp: 170601 18:58:02     Last_SQL_Error_Timestamp:               Master_SSL_Crl:           Master_SSL_Crlpath:           Retrieved_Gtid_Set:            Executed_Gtid_Set:                Auto_Position: 01 row in set (0.00 sec)ERROR:No query specifiedmysql>

注意事项

1、操作Master已经存在而果Slave不存在数据库时，需要先停掉Slave同步。

2、如果客户端无法连接数据库请执行如下脚本：

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;

收官之作：