1、安装MySQL

$ sudo apt-get update #更新源
$ sudo apt-get install mysql-server mysql-client #安装mysql
$ sudo mysql_secure_installation #按提示设置即可
$ sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf #找到 bind-address 修改值为 0.0.0.0(如果需要远程访问)
$ sudo systemctl restart mysql #重启mysql

2、配置MySQL

$ sudo mysql -uroot -p
mysql> SHOW VARIABLES LIKE 'validate_password%'; 
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| 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             | MEDIUM |
| validate_password.special_char_count | 1      |
+--------------------------------------+--------+
mysql> set global validate_password.policy=LOW; #设置密码安全规则
mysql> set global validate_password.length=5;
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER; #修改加密规则
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456'; #使用mysql_native_password重新修改密码
mysql> UPDATE mysql.user SET host = '%' WHERE user = 'root'; #允许远程访问
mysql> FLUSH PRIVILEGES;

3、新增用户赋权并设置远程访问

mysql> CREATE USER 'dev_user'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'dev_user'@'%' WITH GRANT OPTION;