一、mysql 查看端口

[root@localhost ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 723
Server version: 5.7.33 MySQL Community Server (GPL)
Copyright (c) 2000, 2021, Oracle and/or its affiliates.
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 (0.01 sec)
mysql> exit
Bye

二、netstat 查看端口

[root@localhost ~]# netstat -nplt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp6       0      0 :::3306                 :::*                    LISTEN      3115/mysqld         
tcp6       0      0 :::6379                 :::*                    LISTEN      1852/redis-server *

三、修改my.cnf

vim /etc/my.cnf

在这里插入图片描述

四、重启mysql

systemctl restart mysqld

五、netstat 再次查看

[root@localhost ~]# netstat -nplt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp6       0      0 :::19306                :::*                    LISTEN      25953/mysqld        
tcp6       0      0 :::6379                 :::*                    LISTEN      1852/redis-server *