Starting MySQL 8.0.14, to allow the user account has a dual password, designated as primary and secondary passwords password.
Dual password function can be performed seamlessly change the credentials in the following scenarios:
There are a lot of MySQL server system, may be involved in master-slave replication
A plurality of application servers connect to different MySQL
Must conduct regular account password to connect to the server application for change
Experiments are as follows:
mysql version:
mysql>select version();
+-----------+
| version() |
+-----------+
| 8.0.16 |
+-----------+
1 row in set (0.00 sec)
mysql>create user root@'%' identified by '123456';
Query OK, 0 rows affected (0.25 sec)
mysql>grant all privileges on *.* to root@'%';
Query OK, 0 rows affected (0.10 sec)
mysql>alter user root@'%' identified by 'root' RETAIN CURRENT PASSWORD;
Query OK, 0 rows affected (0.28 sec)
Open another session:
Zhengzhou Women's Hospital: http: //byby.zztjyy.com/zztjyy///
Two password can log:
# mysql -uroot -p123456 -h 192.168.140.52
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 21
Server version: 8.0.16 MySQL Community Server - GPL
Copyright (c) 2000, 2019, 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>\q
Bye
[root@test2 ~]# mysql -uroot -proot -h 192.168.140.52
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 22
Server version: 8.0.16 MySQL Community Server - GPL
Copyright (c) 2000, 2019, 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>\q
Bye
丢弃旧密码:
mysql>alter user root@'%' DISCARD OLD PASSWORD;
Query OK, 0 rows affected (0.12 sec)开另外一个会话，用旧密码登录报错：
# mysql -uroot -p123456 -h 192.168.140.52
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'root'@'192.168.140.52' (using password: YES)
新密码可以登录:
# mysql -uroot -p123456 -h 192.168.140.52
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'root'@'192.168.140.52' (using password: YES)
[root@test2 ~]#
[root@test2 ~]#
[root@test2 ~]# mysql -uroot -proot -h 192.168.140.52
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 27
Server version: 8.0.16 MySQL Community Server - GPL
Copyright (c) 2000, 2019, 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>\q
Bye
备注:
RETAIN CURRENT PASSWORD保留帐户当前密码作为其辅助密码，替换任何现有的二级密码。新密码将成为主密码，
但客户端可以使用该帐户使用主密码或辅助密码连接到服务器。
对于ALTER USER， DISCARD OLD PASSWORD丢弃二级密码（如果存在）。该帐户仅保留其主密码，客户端可以使用
该帐户仅使用主密码连接到服务器。