linux mysql数据库修改端口

如何查看mysql 默认端口号和修改端口号 

1. 登录mysql  

[root@test /]# mysql -u root -p  
Enter password:  

2. 使用命令show global variables like 'port';查看端口号  

mysql> show global variables like 'port';  
+---------------+-------+  
| Variable_name | Value |  
+---------------+-------+  
| port | 3306 |  
+---------------+-------+  
1 row in set (0.00 sec)  

3. 修改端口，编辑/etc/my.cnf文件。  

[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]#  

4. 重新启动mysql  

[root@test ~]# /etc/init.d/mysqld restart  或 service mysql restart
Stopping mysqld: [ OK ]  
Starting mysqld: [ OK ]  

5.再次登录后检查端口已修改为’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>  

注意：只有重新启动mysql数据库后端口才真正被改变；