1. 登录到mysql查看当前的端口号：

show global variables like ‘port’;

2.编辑/etc/my.conf 文件添加port=3506   这样的样式 保存退出；

内容:  

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

3. 重启mysqld即可；