MySQL8.0.16賬戶雙密碼實(shí)驗(yàn)一例

從MySQL 8.0.14開始，允許用戶帳戶擁有雙密碼，指定為主密碼和輔助密碼。

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雙密碼功能可以在以下場(chǎng)景中無縫地執(zhí)行憑證更改：

系統(tǒng)有大量MySQL服務(wù)器，可能涉及主從復(fù)制

多個(gè)應(yīng)用程序連接到不同的MySQL服務(wù)器

必須對(duì)應(yīng)用程序用于連接服務(wù)器的帳戶進(jìn)行定期密碼更改

實(shí)驗(yàn)如下:

mysql版本:

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)

開另外一個(gè)session:

兩個(gè)密碼都可以登錄:

# 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

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

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

丟棄舊密碼:

mysql>alter user root@'%' DISCARD OLD PASSWORD;

Query OK, 0 rows affected (0.12 sec)

開另外一個(gè)會(huì)話，用舊密碼登錄報(bào)錯(cuò)：

# 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)

新密碼可以登錄:

# 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 ~]# 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

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

備注:

RETAIN CURRENT PASSWORD保留帳戶當(dāng)前密碼作為其輔助密碼，替換任何現(xiàn)有的二級(jí)密碼。新密碼將成為主密碼，

但客戶端可以使用該帳戶使用主密碼或輔助密碼連接到服務(wù)器。

對(duì)于ALTER USER， DISCARD OLD PASSWORD丟棄二級(jí)密碼（如果存在）。該帳戶僅保留其主密碼，客戶端可以使用

該帳戶僅使用主密碼連接到服務(wù)器。

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