Troubleshoot problems with how to modify the MySQL server listening port

1 If you install the system from the RPM package with the situation:

Modify/ETC/MY.CNF

[mysqld]
datadir=/var/lib/mysql
port=3300 　　　　　　　　　#修改成你自己想要的端口
socket=/var/lib/mysql/mysql.sock
[mysql.server]
user=mysql
basedir=/var/lib
[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

Save exit.

2 If you are installing a different source package or installing multiple MYSQLD services on the same server:

The same configuration, find the My.cnf file. Add port= port number

It is to be noted that

[Client]

Port = 3300

Here also need to change.