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这篇文章给大家介绍MySQL 5.7中忘记root密码怎么办，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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修改mysql参数文件：
[root@test ~]# vi /etc/my.cnf
在
[mysqld]后面加入：
skip-external-locking
保存。
[root@test ~]# service mysqld restart
MySQL server PID file could not be found! [FAILED]
不需要密码就能登录：
[root@test ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.19-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, 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 [(none)]> USE mysql ;
Database changed
MySQL [mysql]> update user set authentication_string=password('test') where user='root' and Host = '127.0.0.1';
Query OK, 1 row affected, 1 warning (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 1
MySQL [mysql]> update user set authentication_string=password('test') where user='root' and Host = '%';
Query OK, 0 rows affected, 1 warning (0.00 sec)
Rows matched: 0 Changed: 0 Warnings: 1
修改完毕。
再把原来在/etc/my.cnf里面[mysqld]后面的
skip-external-locking
去掉。
需要输入密码登录：
[root@test ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.19-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, 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 [(none)]>
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