在实际的开发过程中，可能会需要在一台服务器上部署多个MYSQL实例，
那建议使用MYSQL官方的解决方案 mysqld_multi.
1、安装好MySQL
这个过程比较简单，就不赘述了。
2、编辑 my.cof:
本例中比较简单，详细内容参考链接
------------------------------------------------------
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin
user = root
password = 123456
[mysqld3306]
datadir = /usr/local/mysql_3306
port = 3306
socket = /tmp/mysql_3306.sock
log-bin=/usr/local/mysql_3306/mysql-bin
binlog_format=mixed
binlog_cache_size = 32M
expire_logs_days = 30
[mysqld3307]
datadir = /usr/local/mysql_3307
port = 3307
socket = /tmp/mysql_3307.sock
log-bin=/usr/local/mysql_3307/mysql-bin
binlog_format=mixed
binlog_cache_size = 32M
expire_logs_days = 3
------------------------------------------------------
3、创建数据目录
mkdir /usr/local/mysql_3306
mkdir /usr/local/mysql_3307
4、初始化DB
/usr/local/mysql/bin/mysql_install_db --datadir=/usr/local/mysql_3306 --user=mysql
/usr/local/mysql/bin/mysql_install_db --datadir=/usr/local/mysql_3307 --user=mysql
chown mysql:mysql /usr/local/mysql_3306
chown mysql:mysql /usr/local/mysql_3307
5、开启MySQL
mysqld_multi start 3306
mysqld_multi start 3307
查看是否成功：
[root@Gypsy_111 mysql_3306]# netstat -lnpt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
2575/mysqld
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN
2461/mysqld
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN
1063/vsftpd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1052/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
1290/master
tcp 0 0 :::80 :::* LISTEN
1310/httpd
tcp 0 0 :::22 :::* LISTEN 1052/sshd
tcp 0 0 ::1:25 :::* LISTEN
1290/master
[root@Gypsy_111 mysql_3306]#
[root@Gypsy_111 ~]# mysqld_multi report
Reporting MySQL servers
MySQL server from group: mysqld1 is running
MySQL server from group: mysqld2 is running
6、设置root密码
mysqladmin -uroot password 'mysql3306' -S /tmp/mysql_3306.sock
mysqladmin -uroot password 'mysql3307' -S /tmp/mysql_3307.sock
进入MySQL：
mysql -uroot -pmysql3306 -S /tmp/mysql_3306.sock
mysql -uroot -pmysql3307 -S /tmp/mysql_3307.sock
7、至于如何关闭每个实例
第一种方法：
理论上用 mysqld_multi stop 3306 就可以
但是实验证明关闭不了，不知道为什么？
第二种方法：进入数据库，授权一个可以关闭本实例的用户
mysql -uroot -pmysql3306 -S /tmp/mysql_3306.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY '3306init0';
flush privileges;
mysql -uroot -pmysql3307 -S /tmp/mysql_3307.sock
GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY '3307init0';
flush privileges;
***************************************************************************************
mysql> select user,host from mysql.user;
+-------+------------+
| user | host |
+-------+------------+
| root | 127.0.0.1 |
| | Gypsy\_111 |
| root | Gypsy\_111 |
| | localhost |
| admin | localhost |
| root | localhost |
+-------+------------+
6 rows in set (0.00 sec)
mysql> show grants for admin@localhost;
+------------------------------------------------------------------------------------------------
-----------------+
| Grants for admin@localhost
|
+------------------------------------------------------------------------------------------------
-----------------+
| GRANT SHUTDOWN ON *.* TO 'admin'@'localhost' IDENTIFIED BY PASSWORD
'*F070332A4C00A902B30F07178BDF0AAE4F813B42' |
+------------------------------------------------------------------------------------------------
-----------------+
1 row in set (0.00 sec)
***************************************************************************************
然后：
mysqladmin -uadmin -p3306init0 -S /tmp/mysql_3306.sock shutdown
mysqladmin -uadmin -p3307init0 -S /tmp/mysql_3307.sock shutdown
这样就成功关闭了。
针对 mysqld_multi stop 3306 这种方式为什么关闭不了，请读者多多指教！
参考：
http://blog.chinaunix.net/uid-25760152-id-3472603.html
