搞代码

mysql可以以多实例的方式，实现一台服务器，运行在不同端口不同数据文件的mysql，它们是相互独立的。

1、关闭原有的默认端口3306的mysql:service mysqd stop

2、拷贝或创建数据文件

#拷贝现有的mysql数据库文件 #我的在/var/lib/mysql，拷贝一份至mysql_3307文件夹 [root@test-206 ~]# cp -r /var/lib/mysql /var/lib/mysql_3307

欢迎大家阅读《MYSQL 多实例运作》,跪求各位点评，by 搞代码

#创建一个新的空数据库 [root@test-206 ~]# mkdir /var/lib/mysql_3307 [root@test-206 ~]# mysql_install_db --datadir=/var/lib/mysql_3307 --user=mysql

 3、给数据文件赋予mysql用户与用户组

[root@test-206 ~]# chown -R mysql.mysql /var/lib/mysql_3307

 4、创建multi的配置cnf文件,用于启动这个mysql实例（如3307）载入执行

[root@test-206 ~]# touch /usr/local/my_multi.cnf

 文件中写入你想要的配置，如下为典型配置

[mysqld_multi] mysqld     = /usr/bin/mysqld_safe mysqladmin = /usr/bin/mysqladmin user       = root　　　　#用于登陆和关闭此服务 password   = 123456　　　#同上  [mysqld3307] socket     = /tmp/mysql_3307.sock port       = 3307 pid-file   = /var/lib/mysql_3307/3307.pid datadir    = /var/lib/mysql_3307/ log        = /var/lib/mysql_3307/3307.log character-set-server    = utf8 user       = mysql

 5、启动你的多实例

[root@test-206 ~]# mysqld_multi --defaults-extra-file=/usr/local/my_multi.cnf start 3307

 6、检查是否启动成功

[root@test-206 ~]# netstat -ntlp tcp        0      0 :::3306                     :::*                       LISTEN      3919/mysqld tcp        0      0 :::3307                     :::*                        LISTEN      15027/mysqld

如果没有发现你要的端口号mysql实例，可以检查下/var/lib/mysql_3307/3307.log文件,排除问题

7、设置新的密码

[root@test-206 ~]#  mysqladmin -uroot -S /tmp/mysql_3307.sock password 123456

 8、登入你的新实例

[root@test-206 ~]# mysql -uroot -S /tmp/mysql_3307.sock -p Enter password: Welcome to the MySQL monitor.  Commands end with ; or /g. Your MySQL connection id is 1 Server version: 5.5.20-log Distributed by The IUS Community Project  Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.  Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners.  Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.  mysql>

 再次确认下，你的这个实例，是不是用的mysql_3307这个文件夹的数据

mysql> show variables like '%datadir%'; +---------------+----------------------+ | Variable_name | Value                | +---------------+----------------------+ | datadir       | /var/lib/mysql_3307/ | +---------------+----------------------+ row in set (0.00 sec)  mysql>

 恩，没有错！最后，搞搞权限、用户之类。收工!

#查用户 mysql> select user,host from mysql.user; +------+-----------+ | user | host      | +------+-----------+ | root | 127.0.0.1 | | root | ::1       | |      | localhost | | root | localhost | |      | test-206  | | root | test-206  | +------+-----------+ rows in set (0.00 sec)  #设权限 mysql> grant all on *.* to root@'%' identified by 'root' with grant option; Query OK, 0 rows affected (0.00 sec)  ##查权限 mysql> show grants for root;  ##创用户 mysql> grant select on *.* to backup@'%' identified by 'backup'; Query OK, 0 rows affected (0.00 sec)

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