1、前沿

今天在服務(wù)器安裝mysql之后，登錄發(fā)現(xiàn)密碼錯(cuò)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(huì)自動(dòng)創(chuàng)建一個(gè)初始密碼。

報(bào)錯(cuò)如下:

[root@mytestlnx02 ~]#mysql -u root -p

Enter password:

ERROR1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

2、檢查MySQL服務(wù)是否啟動(dòng)

先檢查MySQL服務(wù)是否啟動(dòng)，如果啟動(dòng)，先關(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

mysql23166 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

root23237 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 ~]#

3、修改MySQL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。

在配置文件中增加兩行代碼。

[mysqld]

skip-grant-tables

作用是登陸MySQL的時(shí)候調(diào)過密碼驗(yàn)證。

然后啟動(dòng)MySQL服務(wù)，并進(jìn)入MySQL。

[root@mytestlnx02 ~]#service mysqld start

[root@mytestlnx02 ~]#[root@mytestlnx02 ~]#mysql -u root

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

mysql>

4、修改密碼

連接mysql這個(gè)數(shù)據(jù)庫，修改用戶名密碼。

mysql>use mysql;

Reading table informationforcompletion 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 (0.00sec)

Rows matched:1 Changed: 1 Warnings: 1mysql>flush privileges;

Query OK,0 rows affected (0.00sec)

mysql> exit

5、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. Commandsend with ; or \g.

CentOS特別說明

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(bào)錯(cuò)

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

ERROR1064 (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

使用初始密碼登陸

[root@VM_0_8_centos ~]#mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commandsendwith ; or \g.

Your MySQL connection id is8Server 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';

ERROR1820(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 (0.11sec)

mysql>flush privileges;

Query OK,0 rows affected (0.01sec)

mysql>exit

Bye

重啟服務(wù)器就生效了

[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

【參考資料】

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