MySql默認(rèn)端口號(hào)為3306,如果安裝多個(gè)或者沖突需要修改端口號(hào),修改my.ini的端口號(hào)就可以了,文件一般情況下在安裝目錄下。
下面是針對(duì)windows具體說(shuō)明:
1、修改前需要把mysql相關(guān)軟件和服務(wù)先停掉;
2、查找mysql的配置文件。
一般情況下都在安裝目錄下,如果不再的話(huà),就找一下c:windows、c:windowssystem32下面或者使用windows的搜索功能找一下my.ini。
例如我的在:D:Program FilesMySQLMySQL Server 5.1my.ini
3、修改下面兩個(gè)地方:
[client]
port=3306
[mysqld]
# The TCP/IP Port the MySQL Server will listen on
port=3306
如下圖所示:

下面是針對(duì)Linux具體說(shuō)明:
1、登錄與查看當(dāng)前端口號(hào)
[root@test /]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 92
Server version: 5.1.66 Source distribution
Copyright (c) 2000, 2012, 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>show global variables like 'port';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| port | 3306 |
+---------------+-------+
1 row in set (0.00 sec)
2、修改端口,編輯/etc/my.cnf文件,早期版本有可能是my.conf文件名,增加端口參數(shù),并且設(shè)定端口,注意該端口未被使用,保存退出。
[root@test etc]# vi my.cnf
[mysqld]
port=3506
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
"my.cnf" 11L, 261C written
[root@test etc]#
3、重新啟動(dòng)mysql
[root@test ~]# /etc/init.d/mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK ]
4、再次登錄后檢查端口已修改為’3506’.
[root@test etc]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.1.66 Source distribution
Copyright (c) 2000, 2012, 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> show global variables like 'port';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| port | 3506 |
+---------------+-------+
1 row in set (0.00 sec)
mysql>
總結(jié):注意修改的端口不要被占用,而且要有規(guī)劃,不要輕意的總是調(diào)整數(shù)據(jù)庫(kù)端口。還有就是安全保障,記得與負(fù)責(zé)網(wǎng)絡(luò)的人提前通知,以免端口無(wú)法正常使用。