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

2014-07-22 23:33 771 查看

案例环境：操作系统：RedHatEnterpriseLinuxServerrelease5.7(Tikanga)64bit数据库版本:Mysql5.6.1964bit案例介绍：今天开始学习mysql，遂先安装了Mysql5.6.1964bit版本的数据库，结果安装成功了，但是使用root登录时遇到了ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:NO)错误.如下所示

[root@DB-Servertmp]#rpm-ivhMySQL-server-5.6.19-1.rhel5.x86_64.rpm

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

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

[root@DB-Servertmp]#rmp-ivhMySQL-client-5.6.19-1.rhel5.x86_64.rpm

-bash:rmp:commandnotfound

[root@DB-Servertmp]#rpm-ivhMySQL-client-5.6.19-1.rhel5.x86_64.rpm

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

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

[root@DB-Servertmp]#/etc/rc.d/init.d/mysqlstatus

MySQLisnotrunning[FAILED]

[root@DB-Servertmp]#/etc/rc.d/init.d/mysqlstart

StartingMySQL.[OK]

[root@DB-Servertmp]#mysql-uroot-p

Enterpassword:

ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:NO)

[root@DB-Servertmp]#mysql-urootmysql

ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:NO)

安装过程中没有设置过root密码，不清楚root密码，搜索了网上一些资料，大致有下面一些情况：
1：有些博客说root的随机密码位于/root/.mysql_secret中，但是我这个版本根本没有/root/.mysql_secret文件。搜索到一篇文章，大意如下所示（没有确认）。到现在也没有明白，我这个版本为什么没有生成这个文件？
ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:NO):表示没有生成root的临时密码
ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:YES):表示生成了root的临时密码。
2：有些资料说root的默认密码为空，经过确认那是以前的老版本，Mysql5.6及以后版本出处于安全考虑，root密码已经不为空了。
另外，我在官网论坛居然发现有很多人遇到类似问题ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:NO)
解决方法：
首先停掉mysql服务器

[root@DB-Serverinit.d]#/etc/rc.d/init.d/mysqlstop

ShuttingdownMySQL..[OK]

然后使用mysqld_safe命令在启动mysql，更新root账号的密码
--skip-grant-tables：不启动grant-tables(授权表),跳过权限控制。
--skip-networking：跳过TCP/IP协议，只在本机访问(从网上有些资料看，这个选项不是必须的。可以不用)

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

[2]9396

[root@DB-Serverinit.d]#14072214:59:46mysqld_safeLoggingto'/var/lib/mysql/DB-Server.err'.

14072214:59:46mysqld_safeStartingmysqlddaemonwithdatabasesfrom/var/lib/mysql

执行上面命令后，此会话窗口会出现无反应的状态，需要使用CTRL+C中断会话，检查/var/lib/mysql/DB-Server.err日志，发现也无其它异常信息。没有弄明白该会话窗口为啥会出现无响应状态。

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

2014-07-2214:59:419346[Note]Shuttingdownplugin'binlog'

2014-07-2214:59:419346[Note]/usr/sbin/mysqld:Shutdowncomplete

14072214:59:41mysqld_safemysqldfrompidfile/var/lib/mysql/DB-Server.pidended

14072214:59:46mysqld_safeStartingmysqlddaemonwithdatabasesfrom/var/lib/mysql

2014-07-2214:59:470[Warning]TIMESTAMPwithimplicitDEFAULTvalueisdeprecated.Pleaseuse--explicit_defaults_for_timesta

mpserveroption(seedocumentationformoredetails).

2014-07-2214:59:479516[Note]Plugin'FEDERATED'isdisabled.

2014-07-2214:59:479516[Note]InnoDB:Usingatomicstorefcountbufferpoolpages

2014-07-2214:59:479516[Note]InnoDB:TheInnoDBmemoryheapisdisabled

2014-07-2214:59:479516[Note]InnoDB:Mutexesandrw_locksuseGCCatomicbuiltins

2014-07-2214:59:479516[Note]InnoDB:Compressedtablesusezlib1.2.3

2014-07-2214:59:479516[Note]InnoDB:UsingLinuxnativeAIO

2014-07-2214:59:479516[Note]InnoDB:UsingCPUcrc32instructions

2014-07-2214:59:479516[Note]InnoDB:Initializingbufferpool,size=128.0M

2014-07-2214:59:479516[Note]InnoDB:Completedinitializationofbufferpool

2014-07-2214:59:479516[Note]InnoDB:HighestsupportedfileformatisBarracuda.

2014-07-2214:59:479516[Note]InnoDB:128rollbacksegment(s)areactive.

2014-07-2214:59:479516[Note]InnoDB:Waitingforpurgetostart

2014-07-2214:59:479516[Note]InnoDB:5.6.19started;logsequencenumber1626087

2014-07-2214:59:479516[Note]/usr/sbin/mysqld:readyforconnections.

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

[root@DB-Serverinit.d]#mysql-urootmysql

Readingtableinformationforcompletionoftableandcolumnnames

Youcanturnoffthisfeaturetogetaquickerstartupwith-A

WelcometotheMySQLmonitor.Commandsendwith;or\g.

YourMySQLconnectionidis1

Serverversion:5.6.19MySQLCommunityServer(GPL)

Copyright(c)2000,2014,Oracleand/oritsaffiliates.Allrightsreserved.

OracleisaregisteredtrademarkofOracleCorporationand/orits

affiliates.Othernamesmaybetrademarksoftheirrespective

owners.

Type'help;'or'\h'forhelp.Type'\c'toclearthecurrentinputstatement.

mysql>selectHost,User,Password,password_expired

->fromuser

->whereuser='root'andhost='root'orhost='localhost';

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

|Host|User|Password|password_expired|

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

|localhost|root|*A848DE7CCD839E924921BEE41711991DDA0D529E|Y|

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

1rowinset(0.00sec)

mysql>updateusersetpassword=PASSWORD('p12#456')

->whereuser='root'andhost='root'orhost='localhost';

QueryOK,1rowaffected(0.00sec)

Rowsmatched:1Changed:1Warnings:0

新设置用户或更改密码后需用flushprivileges刷新MySQL的系统权限相关表，否则会出现拒绝访问，还有一种方法，就是重新启动mysql服务器，来使新设置生效。

mysql>flushprivileges;

QueryOK,0rowsaffected(0.00sec)

mysql>quit

Bye

[root@DB-Serverinit.d]#/etc/rc.d/init.d/mysqlrestart

ShuttingdownMySQL..14072215:02:27mysqld_safemysqldfrompidfile/var/lib/mysql/DB-Server.pidended

[OK]

StartingMySQL.[OK]

[2]-Donemysqld_safe--user=mysql--skip-grant-tables--skip-networking

[root@DB-Serverinit.d]#mysql-urootp

ERROR1045(28000):Accessdeniedforuser'root'@'localhost'(usingpassword:NO)

[root@DB-Serverinit.d]#mysql-uroot-p

Enterpassword:

WelcometotheMySQLmonitor.Commandsendwith;or\g.

YourMySQLconnectionidis2

Serverversion:5.6.19

Copyright(c)2000,2014,Oracleand/oritsaffiliates.Allrightsreserved.

OracleisaregisteredtrademarkofOracleCorporationand/orits

affiliates.Othernamesmaybetrademarksoftheirrespective

owners.

Type'help;'or'\h'forhelp.Type'\c'toclearthecurrentinputstatement.

mysql>

另外，如果登录mysql数据库后执行脚本遭遇ERROR1820(HY000):YoumustSETPASSWORDbeforeexecutingthisstatement,可以使用重新设置一次密码即可解决问题.

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

至此问题解决，但是还有不少地方有些疑惑，为啥出现这个错误？其实这么多资料都只是说了解决方法，但是都回避了问题的原因。
参考资料：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

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