mysql8.0忘記密碼如何找回

為了演示，找個(gè)測(cè)試環(huán)境來操作，千萬不要線上這么搞
pkill mysqld 關(guān)閉掉mysql

跳過MySQL的權(quán)限表啟動(dòng)MySQL服務(wù)：
--skip-grant-tables啟動(dòng)mysql

/usr/local/mysql8013/bin/mysqld_safe --defaults-file=/data/mysql8/my8.cnf --skip-grant-tables & 

將密碼置空：

root@localhost [(none)]>update mysql.user set authentication_string='' where user="root" and host="localhost";
Query OK, 1 row affected (0.06 sec)
Rows matched: 1  Changed: 1  Warnings: 0

root@localhost [(none)]>

pkill mysqld 關(guān)閉掉mysql

再次啟動(dòng)mysql服務(wù)

[root@localhost ~]# /usr/local/mysql8013/bin/mysqld --defaults-file=/data/mysql8/my8.cnf &

無密碼登錄MySQL服務(wù)并設(shè)置新的密碼：

root@localhost [(none)]>select version();
+-----------+
| version() |
+-----------+
| 8.0.13    |
+-----------+
root@localhost [(none)]>alter user user() identified by 'jist558@wei';

[root@localhost ~]# mysql -uroot -p'jist558@wei' -e "select version();"
mysql: [Warning] Using a password on the command line interface can be insecure.
+-----------+
| version() |
+-----------+
| 8.0.13 |
+-----------+

密碼寫入.my.cnf文件就可以mysql直接登錄mysql窗口：

[root@localhost ~]# cat .my.cnf 
[mysql]
prompt="\u@\h:\p \R:\m:\s[\d]>"
no-auto-rehash
user=root
password=jist558@wei

[root@localhost ~]# mysql -e "select version();"
+-----------+
| version() |
+-----------+
| 8.0.13    |
+-----------+

演示完畢