Modify the port number of MySQL (is there a problem modifying the port number of MySQL)

Hello everyone , I meet you again , I'm your friend, Quan Jun .

About mysql Port number

Log on first mysql:

[email protected]:~$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.26-0ubuntu0.18.04.1 (Ubuntu)

Copyright (c) 2000, 2019, 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.

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Enter the command ：

 show global variables like 'port';

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mysql> show global variables like 'port';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| port          | 3306  |
+---------------+-------+
1 row in set (0.04 sec)

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value The value of is your own port number ; Here is 3306, Default port number .

Change the default port number ：

Open file my.cnf, Then add port parameters , Set port , Note that the port should be unused , Be sure to save before exiting

[email protected]:~$ vim 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
[email protected]:~$

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restart mysql:

[email protected]:~$ service mysqld restart

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see mysql essential information ：

Enter the command ：

status;

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mysql> status;
--------------
mysql  Ver 14.14 Distrib 5.7.26, for Linux (x86_64) using  EditLine wrapper

Connection id:		4
Current database:	
Current user:		[email protected]
SSL:			Not in use
Current pager:		stdout
Using outfile:		''
Using delimiter:	;
Server version:		5.7.26-0ubuntu0.18.04.1 (Ubuntu)
Protocol version:	10
Connection:		Localhost via UNIX socket
Server characterset:	latin1
Db     characterset:	latin1
Client characterset:	utf8
Conn.  characterset:	utf8
UNIX socket:		/var/run/mysqld/mysqld.sock
Uptime:			3 hours 10 min 3 sec

Threads: 1  Questions: 9  Slow queries: 0  Opens: 105  Flush tables: 1  Open tables: 98  Queries per second avg: 0.000
--------------

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