Linux mysql 5.6: ERROR 1045 (28000): Access denied for user & #39; root & #39; @ & #39; localhost & #39; (using password: NO ), 28000 denied

Linux mysql 5.6: ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password: NO), 28000 denied

Recently, mysql 5.6 has encountered the following problems.

Thank you for sharing the original article:

CASE Environment:

Operating System:Red Hat Enterprise Linux Server release 5.7 (Tikanga) 64 bit

Database Version:Mysql 5.6.19 64 bit

Case study:

I started to learn mysql this day and installed Mysql 5.6.19 64bit database. The installation was successful, but I encountered ERROR 1045 (28000) when using root login ): access denied for user 'root' @ 'localhost' (using password: NO) error. as shown below

[root@DB-Server tmp]# rpm -ivh MySQL-server-5.6.19-1.rhel5.x86_64.rpm 

Preparing...                ########################################### [100%]

   1:MySQL-server           ########################################### [100%]

[root@DB-Server tmp]# rmp -ivh MySQL-client-5.6.19-1.rhel5.x86_64.rpm 

-bash: rmp: command not found

[root@DB-Server tmp]# rpm -ivh MySQL-client-5.6.19-1.rhel5.x86_64.rpm 

Preparing...                ########################################### [100%]

   1:MySQL-client           ########################################### [100%]

[root@DB-Server tmp]# /etc/rc.d/init.d/mysql status

MySQL is not running[FAILED]

[root@DB-Server tmp]# /etc/rc.d/init.d/mysql start

Starting MySQL.[  OK  ]

[root@DB-Server tmp]# mysql -u root -p

Enter password: 

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

[root@DB-Server tmp]# mysql -u root mysql

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

The root password has not been set during the installation process. If you do not know the root password, you can search for the following information on the Internet:

1: Some blogs say that the root random password is in/root/. mysql_secret, but I have no/root/. mysql_secret file in this version. I found an article with the following general idea (no confirmation ). I still don't understand why I didn't generate this file in this version?

ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password: NO): NO temporary root password is generated.

ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password: YES): indicates that the temporary password of root is generated.

2: Some documents indicate that the default password of root is blank. It is confirmed that it is the old version. For Mysql 5.6 and later versions, the root password is no longer blank due to security considerations.

In addition, I found many people on the official website that encountered similar problems: ERROR 1045 (28000): Access denied for user 'root' @ 'localhost' (using password: NO)

Solution:

Stop the mysql server first.

[root@DB-Server init.d]# /etc/rc.d/init.d/mysql stop

 Shutting down MySQL..[ OK ]

Then run the mysqld_safe command to start mysql and update the password of the root account.

-- Skip-grant-tables: Do not start grant-tables (Authorization Table), skip permission control.

-- Skip-networking: skip the TCP/IP protocol and only access it from the Local Machine (this option is not required according to some information on the Internet. No)

[root@DB-Server init.d]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

[2] 9396

[root@DB-Server init.d]# 140722 14:59:46 mysqld_safe Logging to '/var/lib/mysql/DB-Server.err'.

140722 14:59:46 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

After executing the above command, this session window will be unresponsive, you need to use CTRL + C to interrupt the session, check/var/lib/mysql/DB-Server.err log, no other exception information is found. I didn't understand why the session window was unresponsive.

tail -200 /var/lib/mysql/DB-Server.err | more

2014-07-22 14:59:41 9346 [Note] Shutting down plugin 'binlog'

2014-07-22 14:59:41 9346 [Note] /usr/sbin/mysqld: Shutdown complete

140722 14:59:41 mysqld_safe mysqld from pid file /var/lib/mysql/DB-Server.pid ended

140722 14:59:46 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

2014-07-22 14:59:47 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timesta

mp server option (see documentation for more details).

2014-07-22 14:59:47 9516 [Note] Plugin 'FEDERATED' is disabled.

2014-07-22 14:59:47 9516 [Note] InnoDB: Using atomics to ref count buffer pool pages

2014-07-22 14:59:47 9516 [Note] InnoDB: The InnoDB memory heap is disabled

2014-07-22 14:59:47 9516 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2014-07-22 14:59:47 9516 [Note] InnoDB: Compressed tables use zlib 1.2.3

2014-07-22 14:59:47 9516 [Note] InnoDB: Using Linux native AIO

2014-07-22 14:59:47 9516 [Note] InnoDB: Using CPU crc32 instructions

2014-07-22 14:59:47 9516 [Note] InnoDB: Initializing buffer pool, size = 128.0M

2014-07-22 14:59:47 9516 [Note] InnoDB: Completed initialization of buffer pool

2014-07-22 14:59:47 9516 [Note] InnoDB: Highest supported file format is Barracuda.

2014-07-22 14:59:47 9516 [Note] InnoDB: 128 rollback segment(s) are active.

2014-07-22 14:59:47 9516 [Note] InnoDB: Waiting for purge to start

2014-07-22 14:59:47 9516 [Note] InnoDB: 5.6.19 started; log sequence number 1626087

2014-07-22 14:59:47 9516 [Note] /usr/sbin/mysqld: ready for connections.

Version: '5.6.19'  socket: '/var/lib/mysql/mysql.sock'  port: 0  MySQL Community Server (GPL)

-> From user

    -> where user='root' and host='root' or host='localhost';

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

| Host      | User | Password                                  | password_expired |

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

| localhost | root | *A848DE7CCD839E924921BEE41711991DDA0D529E | Y                |

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

1 row in set (0.00 sec)

mysql> update user set password=PASSWORD('p12#456')

    -> where user='root' and host='root' or host='localhost';

Query OK, 1 row affected (0.00 sec)

Rows matched: 1  Changed: 1  Warnings: 0

After setting a new user or changing the password, use flush privileges to refresh the MySQL system permission table. Otherwise, access is denied. Another method is to restart the mysql server, to make the new settings take effect.

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> quit

Bye

[root@DB-Server init.d]# /etc/rc.d/init.d/mysql restart

Shutting down MySQL..140722 15:02:27 mysqld_safe mysqld from pid file /var/lib/mysql/DB-Server.pid ended

[  OK  ]

Starting MySQL.[  OK  ]

[2]-  Done                    mysqld_safe --user=mysql --skip-grant-tables --skip-networking

[root@DB-Server init.d]# mysql -u root p

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

[root@DB-Server init.d]# mysql -u root -p

Enter password: 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.6.19

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

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

mysql> 

In addition, if ERROR 1820 (HY000): You must set password before executing this statement occurs after logging on to the mysql database, You can reset the PASSWORD to solve the problem.

mysql>set password = password('p12#456'); 

 

Now the problem is solved, but there are still some questions. Why is this error? In fact, all these materials are about solutions, but they all shy away from the causes.

References:

Http://huangyifa163.blog.163.com/blog/static/262875752011127102215790/

Http://sundful.iteye.com/blog/704337

Http://wenku.baidu.com/view/735ffa41be1e650e52ea995a.html

Http://www.cnblogs.com/sunson/articles/2172086.html

Http://blog.163.com/eric1945@126/blog/static/164934572201081494343373/

Http://www.cnblogs.com/likai198981/archive/2013/04/06/3002518.html

Author: Xiaoxiang hidden Source: http://www.cnblogs.com/kerrycode/