Mysql在线安装及基本操作

 更新apt工具

sudo apt update  

安装MySQL

sudo apt install mysql-server

查看MySQL状态

sudo systemctl status mysql

pass@pass:~$ sudo systemctl status mysql
● mysql.service - MySQL Community Server
     Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2024-03-19 12:27:01 UTC; 17s ago
   Main PID: 2649 (mysqld)
     Status: "Server is operational"
      Tasks: 38 (limit: 4557)
     Memory: 365.5M
     CGroup: /system.slice/mysql.service
             └─2649 /usr/sbin/mysqld

Mar 19 12:27:00 pass systemd[1]: Starting MySQL Community Server...
Mar 19 12:27:01 pass systemd[1]: Started MySQL Community Server.

 初始MySQL配置

sudo mysql_secure_installation

pass@pass:~$ sudo mysql_secure_installation

Securing the MySQL server deployment.

Connecting to MySQL using a blank password.

VALIDATE PASSWORD COMPONENT can be used to test passwords
and improve security. It checks the strength of password
and allows the users to set only those passwords which are
secure enough. Would you like to setup VALIDATE PASSWORD component?

Press y|Y for Yes, any other key for No: y

There are three levels of password validation policy:

LOW    Length >= 8
MEDIUM Length >= 8, numeric, mixed case, and special characters
STRONG Length >= 8, numeric, mixed case, special characters and dictionary                  file

Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 0

根据提示按照个人需求操作....

 以root用户登录，自定义密码

 

pass@pass:~$ sudo mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.36-0ubuntu0.20.04.1 (Ubuntu)

Copyright (c) 2000, 2024, 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>

自定义密码步骤，修改密码等级操作

mysql> SHOW VARIABLES LIKE 'validate_password%';
+-------------------------------------------------+-------+
| Variable_name                                   | Value |
+-------------------------------------------------+-------+
| validate_password.changed_characters_percentage | 0     |
| validate_password.check_user_name               | ON    |
| validate_password.dictionary_file               |       |
| validate_password.length                        | 8     |
| validate_password.mixed_case_count              | 1     |
| validate_password.number_count                  | 1     |
| validate_password.policy                        | LOW   |
| validate_password.special_char_count            | 1     |
+-------------------------------------------------+-------+
8 rows in set (0.01 sec)

mysql> set global validate_password.policy=LOW;
Query OK, 0 rows affected (0.01 sec)

mysql> set global validate_password.length =4;
Query OK, 0 rows affected (0.00 sec)

mysql> ALTER user 'root'@'localhost' IDENTIFIED BY 'pass';
Query OK, 0 rows affected (0.00 sec)

mysql> exit
Bye

 刷新数据库，查看root用户

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT user,host FROM mysql.user;
+------------------+-----------+
| user             | host      |
+------------------+-----------+
| debian-sys-maint | localhost |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
+------------------+-----------+
5 rows in set (0.00 sec)

mysql> quit;
Bye