mysql中grant all privileges on赋给用户远程权限

• 改表法。

当你的帐号不允许从远程登陆，只能在localhost连接时。这个时候只要在mysql服务器上，更改 mysql 数据库里的 user 表里的 host 项，从localhost"改成%即可实现用户远程登录

在安装mysql的机器上运行：

1. mysql -u root -p  

2. select host,user from user where user='root';

3. update user set host = '%' where user='root' and host='localhost';  

4. select host, user from user where user='root';

• 授权法

[root@aaa-server ~]# mysql -u root -p
MariaDB [(none)]> grant all privileges on *.* to root@'%' identified by '123' with grant option;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> exit
Bye

• 授权法。

例如，你想user使用mypwd从任何主机连接到mysql服务器的话。

在安装mysql的机器上运行：

1. GRANT ALL PRIVILEGES ON *.* TO 'user'@'%' IDENTIFIED BY 'mypwd' WITH

      GRANT OPTION;  

2.FLUSH   PRIVILEGES;


模板：
grant all privileges on 库名.表名 to '用户名'@'IP地址' identified by '密码' with grant option;
flush privileges;

• 如果你想允许用户user从ip为192.168.1.4的主机连接到mysql服务器，并使用mypwd作为密码

在安装mysql的机器上运行：

 GRANT ALL PRIVILEGES ON *.* TO 'user'@'192.168.1.3' IDENTIFIED BY 'mypwd' WITH GRANT OPTION;   

 FLUSH   PRIVILEGES;

注意授权后必须FLUSH PRIVILEGES;否则无法立即生效。

高版本数据库不能按照grant all privileges on *.* to "root"@"%" identified by "xxxx";去修改用户权限

mysql> SELECT @@VERSION;
+-----------+
| @@VERSION |
+-----------+
| 8.0.14    |
+-----------+
1 row in set (0.00 sec)

高版本修改用户权限方法：

# 先创建远程用户，再授权
mysql> create user 'root'@'%' identified by  'password';
Query OK, 0 rows affected (0.03 sec)

mysql> grant all privileges on *.* to 'root'@'%' with grant option;
Query OK, 0 rows affected (0.01 sec)

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

再次查看发现有了root %

mysql>  select User,Host from user;
+------------------+-----------+
| User             | Host      |
+------------------+-----------+
| root             | %         |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
+------------------+-----------+
5 rows in set (0.00 sec)
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