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 -pEnter 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 mysqlroot     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=mysqlmysql    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.sockroot     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 namesYou can turn off this feature to get a quicker startup with -A Database changedmysql> 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 -pEnter 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.log2018-09-26T04:25:54.927944Z 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 -pEnter password: Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 8Server version: 8.0.12 MySQL Community Server - GPLCopyright (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> exitBye

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 startRedirecting to /bin/systemctl start  mysqld.service