#拷貝現有的mysql數據庫文件
#我的在/var/lib/mysql，拷貝一份至mysql_3307文件夾
[root@test-206 ~]# cp -r /var/lib/mysql /var/lib/mysql_3307

#創建一個新的空數據庫
[root@test-206 ~]# mkdir /var/lib/mysql_3307
[root@test-206 ~]# mysql_install_db --datadir=/var/lib/mysql_3307 --user=mysql

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

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

[mysqld_multi]
mysqld = /usr/bin/mysqld_safe
mysqladmin = /usr/bin/mysqladmin
user = root　　　　#用于登陸和關閉此服務
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

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

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

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

[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>

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

mysql>

#查用戶
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)

#設權限
mysql> grant all on *.* to root@'%' identified by 'root' with grant option;
Query OK, 0 rows affected (0.00 sec)

##查權限
mysql> show grants for root;

##創用戶
mysql> grant select on *.* to backup@'%' identified by 'backup';
Query OK, 0 rows affected (0.00 sec)