mysql -u root -p

mysql>use mysql;

mysql>update user set host =’%'where user =’root’;

mysql>flush privileges;

mysql> use mysql

Reading table information for completion of table and column names

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Database changed

mysql> update user set password=password('root123') where user='root' and host='localhost'

-> ;

Query OK, 1 row affected (0.00 sec)

Rows matched: 1  Changed: 1  Warnings: 0

mysql> select 'host' from user where user='root'

-> ;

+------+

| host |

+------+

| host |

| host |

| host |

| host |

+------+

4 rows in set (0.00 sec)

mysql> GRANT ALL PRIVILEGES ON *.* TO ‘root’@‘%’ IDENTIFIED BY ‘root123’ WITH GRANT OPTION;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%’ IDENTIFIED BY ‘root123’ WITH GRANT OPTION' at line 1

mysql> grant all privileges on *.* to 'root'@'%' identified by 'root123' with grant option;

Query OK, 0 rows affected (0.00 sec)

mysql> update user set host='%' where user='root'

-> flush privileges;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'flush privileges' at line 2

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> select host from user where user='root'

-> ;

+-----------------------+

| host                  |

+-----------------------+

| %                     |

| 127.0.0.1             |

| ::1                   |

| localhost             |

| localhost.localdomain |

+-----------------------+

5 rows in set (0.00 sec)

mysql> update user set host='%' where user='root';

ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> select host,user from user where user='root'

-> ;

+-----------------------+------+

| host                  | user |

+-----------------------+------+

| %                     | root |

| 127.0.0.1             | root |

| ::1                   | root |

| localhost             | root |

| localhost.localdomain | root |

+-----------------------+------+

5 rows in set (0.00 sec)

mysql>