mysql 多实例运行 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
mysql 多实例运行
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
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#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
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#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_safemysqladmin = /usr/bin/mysqladminuser = root#用于登陆和关闭此服务password = 123456　#同上[mysqld3307]socket = /tmp/mysql_3307.sockport = 3307pid-file = /var/lib/mysql_3307/3307.piddatadir = /var/lib/mysql_3307/log = /var/lib/mysql_3307/3307.logcharacter-set-server = utf8user = 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 -ntlptcp 0 0 :::3306 :::* listen 3919/mysqldtcp 0 0 :::3307 :::* listen 15027/mysqld
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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 -penter password:welcome to the mysql monitor. commands end with ; or \g.your mysql connection id is 1server version: 5.5.20-log distributed by the ius community projectcopyright (c) 2000, 2011, oracle and/or its affiliates. all rights reserved.oracle is a registered trademark of oracle corporation and/or itsaffiliates. other names may be trademarks of their respectiveowners.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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