linux系統(tǒng)中mysql數(shù)據(jù)庫密碼錯誤怎么辦

linux系統(tǒng)中mysql數(shù)據(jù)庫密碼錯誤怎么辦？相信很多沒有經(jīng)驗的人對此束手無策，為此本文總結(jié)了問題出現(xiàn)的原因和解決方法，通過這篇文章希望你能解決這個問題。    

前言

今天在服務(wù)器安裝mysql之后，登錄發(fā)現(xiàn)密碼錯誤，但是我沒有設(shè)置密碼呀，最后百度之后得知，mysql在5.7版本之后會自動創(chuàng)建一個初始密碼。

報錯如下:

[root@mytestlnx02 ~]# mysql -u root -p
Enter password: 
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

修改密碼

1. 檢查mysql服務(wù)是否啟動，如果啟動，關(guān)閉mysql服務(wù)

//查看mysql服務(wù)狀態(tài)
[root@mytestlnx02 ~]# ps -ef | grep -i mysql
root     22972     1  0 14:18 pts/0    00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql
mysql    23166 22972  0 14:18 pts/0    00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
root     23237 21825  0 14:22 pts/0    00:00:00 grep -i mysql
//關(guān)閉服務(wù)
[root@mytestlnx02 ~]# service mysql stop
[root@mytestlnx02 ~]#

2. 修改mysql的配置文件my.cnf

my.cnf配置文件的位置，一般在/etc/my.cnf，有些版本在/etc/mysql/my.cnf

在配置文件中，增加2行代碼

[mysqld]
skip-grant-tables

作用是登錄mysql的時候跳過密碼驗證

然后啟動mysql服務(wù)，并進入mysql

[root@mytestlnx02 ~]# service mysqld start
[root@mytestlnx02 ~]#
[root@mytestlnx02 ~]# mysql -u root 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>

3. 修改密碼

連接mysql這個數(shù)據(jù)庫，修改用戶密碼

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> update mysql.user set authentication_string=password('root_password') where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
 
mysql> exit

4. 重啟mysql服務(wù)

先將之前加在配置文件里面的2句代碼注釋或刪除掉，然后重啟mysql服務(wù)，就可以使用剛剛設(shè)置的密碼登錄了。

[root@mytestlnx02 ~]# service mysql start
[root@mytestlnx02 ~]#
[root@mytestlnx02 ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
p.s.

在CentOS上的操作方式有所不同。

執(zhí)行修改密碼的命令一直報錯

mysql> update user set authentication_string=password('xxxxxxxx') where User='root';       
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 '('root_password') where User='root'' at line 1

不可能是語法問題，檢查了很多遍，最后發(fā)現(xiàn)CentOS下應(yīng)該這樣操作：

查看初始密碼

[root@VM_0_8_centos ~]# grep 'temporary password' /var/log/mysqld.log
2018-09-26T04:25:54.927944Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: DN34N/=?aIfZ

可以看到初始密碼為DN34N/=?aIfZ

使用初始密碼登錄

[root@VM_0_8_centos ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.12 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

修改密碼

mysql> ALTER USER 'root' IDENTIFIED BY 'xxxxxxxxx';  
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'xxxxxxxx';
Query OK, 0 rows affected (0.11 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> exit
Bye
重啟服務(wù)

就生效了

[root@VM_0_8_centos ~]# service mysqld stop 
Redirecting to /bin/systemctl stop  mysqld.service
[root@VM_0_8_centos ~]# service mysqld start
Redirecting to /bin/systemctl start  mysqld.service

看完這篇文章，你能夠獨立解決mysql數(shù)據(jù)庫密碼錯誤的問題了嗎？如果還想學到更多技能或想了解更多相關(guān)內(nèi)容，歡迎關(guān)注億速云行業(yè)資訊頻道，感謝各位的閱讀。