ubuntu18.04安装mysql以及重置密码创建新用户

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1、安装mysql

sudo apt-get install mysql-server
sudo apt-get install mysql-client
sudo apt-get install libmysqlclient-dev

通过sudo netstat -tap | grep mysql检查之后，如果看到有mysql 的socket处于 listen 状态则表示安装成功

登录权限问题

Ubuntu18.04 安装mysql之后，发现普通用户和远程都没有权限连接。

ERROR 1045: Access denied for user: 'root@localhost' (Using 
password: YES)

修改了密码也不对。然后sudo mysql -u root即可登录。这显然不是我们想要的。

2、删除用户创建新用户

删除root，重新创建用户。

首先，登录

sudo mysql -u root

然后查看当前用户

SELECT User,Host FROM mysql.user;
+------------------+-----------+
| User             | Host      |
+------------------+-----------+
| admin            | localhost |
| debian-sys-maint | localhost |
| magento_user     | localhost |
| mysql.sys        | localhost |
| root             | localhost |

删除root账号

mysql> DROP USER 'root'@'localhost';
Query OK, 0 rows affected (0,00 sec)

重新创建root：

mysql> CREATE USER 'root'@'%' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0,00 sec)

授权

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
Query OK, 0 rows affected (0,00 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0,01 sec)

3、关于重置密码

host为%时允许远程登录

SET PASSWORD FOR root@'localhost' = PASSWORD('password');

or

UPDATE mysql.user SET Password=PASSWORD('newpwd') WHERE User='root';

or

USE mysql
UPDATE user SET Password = PASSWORD('newpwd')
WHERE Host = 'localhost' AND User = 'root';

允许任何地方登录

USE mysql
UPDATE user SET Password = PASSWORD('newpwd')
WHERE Host = '%' AND User = 'root';