mysql 5.7 初始化密碼

安裝了mysql5.7以後初始密碼再也不默認爲空

1.查看初始密碼：

[root@VM_225_102_centos ~]# grep 'temporary password' /var/log/mysqld.log 
2016-07-08T02:25:46.311098Z 1 [Note] A temporary password is generated for root@localhost: MtPqF0/oN5zo

即初始密碼爲 MtPqF0/oN5zo    （密碼是隨機產生的，每臺機器產生的都不同哦）

2.登陸及修改密碼：

[root@VM_225_102_centos ~]# mysql -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or /g.
Your MySQL connection id is 4
Server version: 5.7.11


Copyright (c) 2000, 2016, 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> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

登陸以後 第一步必須先修改密碼，不然其餘操做都執行不了。

修改密碼的方法：

mysql> alter user root@localhost identified by 'tyzZ001!';
Query OK, 0 rows affected (0.00 sec)

新修改的密碼中 必須包含 大小寫字母數字及符號