mysql5.7.26-忘记密码（CentOS为例）

编辑 my.cnf　
```
[mysqld]下插入 skip-grant-tables
```

[root@VM_0_7_centos mysql]# vim /etc/my.cnf

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
skip-grant-tables

#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

重启 MySQL 服务

[root@VM_0_7_centos mysql]# service mysqld restart

进入MySQL

[root@VM_0_7_centos mysql]# mysql -uroot

更新密码

flush privileges;
alter user 'root'@'localhost' identified with mysql_native_password by '123456';
flush privileges;
exit;

编辑 my.cnf 注释掉 skip-grant-tables
重启MySQL服务

[root@VM_0_7_centos mysql]# service mysqld restart

进入MySQL 输入密码

[root@VM_0_7_centos mysql]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.7.26 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>

结束