對於DBA來講,丟失超管用戶root的密碼是致命的,mysql
能夠經過添加--ship-grant-tables參數來跳過權限表。sql
這個時候須要強制停庫,先查看MySQL進程號數據庫
Kill掉MySQL進程,命令以下:測試
Kill完能夠再查看是否還有進程spa
[root@tse2 tmp]# kill -9 9840 1 [root@tse2 tmp]# ps -ef |grep mysql
建議停庫這種操做不要影響業務的狀況下,停服操做的,還有最好這種密碼記錄好的,能夠用keepass保存密碼軟件!code
而後加跳過權限表參數,重啓數據庫。這樣即便不輸入密碼,也能夠進入數據庫。orm
[root@tse2 bin]# mysqld_safe --defaults-file=/etc/my.cnf --skip-grant-tables & [1] 4854
直接輸入mysql不須要密碼便可進入blog
給root用戶設置新的密碼並刷新權限,MySQL5.7以後,庫下的password字段用authentication_string字段代替。進程
(product)root@localhost:mysql.sock [(none)]> use mysql; Database changed (product)root@localhost:mysql.sock [mysql]> update user set authentication_string=password('123456') where user='root'; Query OK, 0 rows affected, 1 warning (0.00 sec) Rows matched: 1 Changed: 0 Warnings: 1 (product)root@localhost:mysql.sock [mysql]> flush privileges; Query OK, 0 rows affected (0.00 sec)
設置完成以後,重啓數據庫。注意重啓的時候不須要再加--skip-grant-tables參數了,正常啓動服務,輸入新的密碼能夠正常進入數據庫了。這邊重啓之後測試直接mysql沒有密碼是沒法進入的了。ip
[root@tse2 bin]# mysqld_safe --deaults-file=/etc/my.cnf & [2] 6720 [root@tse2 bin]# 2020-01-16T02:55:45.223195Z mysqld_safe Logging to '/mysql/mysql3306/logs/error.log'. 2020-01-16T02:55:45.262302Z mysqld_safe A mysqld process already exists [2]+ Exit 1 mysqld_safe --deaults-file=/etc/my.cnf [root@tse2 bin]# mysql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
這邊輸入密碼鏈接,便可正常進入,是修改後的密碼123456
[root@tse2 bin]# mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.7.23-log 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. (product)root@localhost:mysql.sock [(none)]> use mysql Database changed (product)root@localhost:mysql.sock [mysql]> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | +--------------------+ 4 rows in set (0.01 sec)