MySQL 查看初始密码并修改

环境

系统 Centos 7.3
MySQL 5.7.24

设置

一、查看初始密码

[deployer@lqas home]$ grep 'temporary password' /var/log/mysqld.log
2019-10-25T02:18:49.492601Z 1 [Note] A temporary password is generated for root@localhost: %ss.wKa3FchV

%ss.wKa3FchV 就是初始密码

####二、使用初始密码登陆

[deployer@lqas home]$ mysql -u root -p                             
Enter password: 

输入刚才查到的初始密码，然后进入 MySQL

####三、修改密码

# 设置新的 root 密码
mysql> alter user 'root'@'localhost' identified by '你的密码';
Query OK, 1 rows affected (0.00 sec)
# 刷新
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
# 可以远程登陆 
mysql> grant all privileges on *.* to 'root'@'%' identified by '你的密码' with grant option; 
Query OK, 1 rows affected (0.00 sec)
# 刷新
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

注意中间的两次刷新不要少，少了可能会报错~

四、测试修改是否成功

重启 MySQL 服务 systemctl; restart mysqld
使用新密码登陆 mysql -u root -p
在数据库中更换数据库 use msyql;
结果如下：

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 5.7.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, 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> 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