MySQL修改密码
mysql临时密码">一、查看MySQL临时密码
Linux安装好MySQL后,为了增加数据库的安全性,在安装时会为root用户生成一个临时的随机密码,存放在/var/log/mysqld.log 中。
[root@localhost mysql_bundle]# cat /var/log/mysqld.log | grep temp2020-05-12T12:05:15.901037Z 1 [Note] A temporary password is generated for root@localhost: .fJJk*j&t4h6
2020-05-12T12:05:18.403371Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
这个.fJJk*j&t4h6就是临时密码。第一次登录就使用这个密码。
二、修改密码
登录后输入show databases命令查看数据库中有哪些库,发现出现错误。
mysql> show databases;ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql>
这条错误语句时说必须使用ALTER USER重设密码才可以执行这条语句。
那么接下来就重置密码吧。
注意:密码要符合复杂度规则,也就是说要包含大小写字母、数字、特殊符号,并且长度不小于八位。否则会报错,如下:
mysql> alter user root@localhost identified by "123456";ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql>
设置一个合格的密码。
mysql> alter user root@localhost identified by "MySQLroot123#";Query OK, 0 rows affected (0.00 sec)
mysql>
- alter user是命令
- root@localhost 是用户名,这是MySQL用户名的完整格式,@符号前面是用于登录的用户名,后面的是主机名,localhost表示root只能在本地登录。
- identified by是指定密码的命令
使用exit退出系统,之后就可以使用新密码登录MySQL。
[root@localhost mysql_bundle]# mysql -uroot -pEnter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 5
Server version: 5.7.29 MySQL Community Server (GPL)
Copyright (c) 2000, 2020, 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> exit
Bye
[root@localhost mysql_bundle]#
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