mysql修改加密方式

安装

安装mysql服务

sudo apt-get install mysql-server

配置初始化信息

sudo mysql_secure_installation

具体配置信息

#1
VALIDATE PASSWORD PLUGIN can be used to test passwords...
Press y|Y for Yes, any other key for No: N (我的选项)

#2
Please set the password for root here...
New password: (输入密码)
Re-enter new password: (重复输入)

#3
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them...
Remove anonymous users? (Press y|Y for Yes, any other key for No) : N (我的选项)

#4
Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network...
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : Y (我的选项)

#5
By default, MySQL comes with a database named 'test' that
anyone can access...
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : N (我的选项)

#6
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : Y (我的选项)

修改加密方式

在Ubuntu系统中MySQL 5.7及之后的版本，MySQL的root用户被默认设置成通过auth_socket插件进行认证，而不是通过密码。在很多情况下，这些配置可以使系统更加的安全和可靠，但如果允许外部程序（例如phpMyAdmin）访问时，这将是事情变得非常复杂。

为了能够以root用户通过密码的方式连接MySQL，你需要将其认证方式从 auth_socket 方式变更为mysql_native_password。进行该设置，通过终端打开MySQL的提示符：

sudo mysql
use mysql;
select host, user, authentication_string, plugin from user;

表格介绍:

host: 允许用户登录的 ip ‘位置’ % 表示可以远程；
user: 当前数据库的用户名；
authentication_string: 用户密码（在mysql 5.7.9以后废弃了password字段和password()函数）；
plugin：密码加密方式；

update user set Host='%' where User='root';
alter user 'root'@'%' identified with mysql_native_password by 'password';
#password换成你的密码

注意这个密码如果设置的比较简单，例如 123456 等等，会设置不成功，它会提示你设置的密码太简单，最好设置成大写字母、数字、符号的组合。这个也是新版mysql的一个特点,MySQL 5.7.6 以后废弃了 user 表中的 password 字段和 password() 方法，所以使用旧的方法去重置密码对 mysql 8.0 是不行的！

可以将安全策略改为低

SHOW VARIABLES LIKE 'validate_password%';

这时再次查看权限

select host, user, authentication_string, plugin from user;

修改成功