Linux CentOS 7 MySQL 修改root密码和设置权限

Access denied for user 'root'@'localhost' (using password: YES)

[root@localhost ~]# vim /etc/my.cnf

skip-grant-tables

[root@localhost ~]# mysql -u root -p

mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.43 MySQL Community Server (GPL)

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owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select host,user,password from user;
+-----------------------+------+-------------------------------------------+
| host                  | user | password                                  |
+-----------------------+------+-------------------------------------------+
| 192.168.5.104         | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| localhost.localdomain | root |                                           |
| 127.0.0.1             | root |                                           |
| ::1                   | root |                                           |
| %                     | root | *FABE5482D5AADF36D028AC443D117BE1180B9725 |
+-----------------------+------+-------------------------------------------+
5 rows in set (0.00 sec)

mysql> UPDATE user SET Password = PASSWORD('root') WHERE user = 'root';
Query OK, 4 rows affected (0.01 sec)
Rows matched: 5  Changed: 4  Warnings: 0

mysql> select user, host,password  from user;
+------+-----------------------+-------------------------------------------+
| user | host                  | password                                  |
+------+-----------------------+-------------------------------------------+
| root | 192.168.5.104         | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| root | localhost.localdomain | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| root | 127.0.0.1             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| root | ::1                   | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| root | %                     | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+------+-----------------------+-------------------------------------------+
5 rows in set (0.00 sec)

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

[root@localhost ~]# systemctl restart mysqld.service 

mysql>  GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION; 
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.5.104'  IDENTIFIED BY 'root'WITH GRANT OPTION;
Query OK, 0 rows affected (0.00 sec)

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

[root@localhost ~]# systemctl restart mysqld.service