mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.01 sec)
 
mysql>

看到默认初始化了mysql数据库，其中user表里面存储MySQL用户信息。我们可以看一下默认MySQL用户：

 select user,host,authentication_string from mysql.user;

mysql> select user,host,authentication_string from mysql.user;
+------------------+-----------+-------------------------------------------+
| user | host | authentication_string |
+------------------+-----------+-------------------------------------------+
| mysql.infoschema | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.session | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.sys | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| root | localhost | *27C237A977F4F44D3F551F1A673BE14DFD232961 |
+------------------+-----------+-------------------------------------------+
4 rows in set (0.00 sec)
 
mysql>

管理员root的host是localhost，代表仅限localhost登录访问。如果要允许开放其他ip登录，则需要添加新的host。如果要允许所有ip访问，可以直接修改成“%”

创建用户：

CREATE USER 'xxh'@'%' IDENTIFIED WITH mysql_native_password BY 'xxh123!@#';

#(需要注意：mysql8.0加密方式修改了)
#检查用户

select user, host, plugin, authentication_string from user\G;

授权远程数据库

#授权所有权限 
GRANT ALL PRIVILEGES ON *.* TO 'xxh'@'%'；
#授权基本的查询修改权限，按需求设置
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP,ALTER ON *.* TO 'xxh'@'%';

查看用户权限

show grants for 'xxh'@'%';

示例：

mysql> use mysql;
Database changed
mysql> CREATE USER 'xxh'@'%' IDENTIFIED WITH mysql_native_password BY 'xxh123!@#'; #创建用户(注意：mysql8.0加密方式修改了)
Query OK, 0 rows affected (0.07 sec)
mysql> 

查看密码加密方式：

mysql> select user, host, plugin, authentication_string from user;
+------------------+-----------+-----------------------+-------------------------------------------+
| user | host | plugin | authentication_string |
+------------------+-----------+-----------------------+-------------------------------------------+
| xxh | % | mysql_native_password | *70FD6FB4F675E08FF785A754755B5EBA6DA62851 |
| mysql.infoschema | localhost | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.session | localhost | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.sys | localhost | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| root | localhost | mysql_native_password | *27C237A977F4F44D3F551F1A673BE14DFD232961 |
+------------------+-----------+-----------------------+-------------------------------------------+
5 rows in set (0.00 sec)
 
mysql>

另外，如果需要新增账户，或者本机以外的其他人访问MySQL则还需要设置内置账户的host，具体可以参考：MySQL创建用户与授权。

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