Mysql忘记root密码了怎么办（完整步骤）

前提，51Testing软件测试网RCRf5~R Uai

能登录到mysql的这台Linux服务器 ；51Testing软件测试网uQ(~3_4N`L

已经忘记了mysql root密码，无法登录的情况下，51Testing软件测试网w|.nBT9A&{

限于有权限修改mysql安装文件（此方法适用于linux ）
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以Linux为例： 

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1.编辑/etc/my.cnf配置文件，vim /etc/my.cnf51Testing软件测试网:U%Wh I(N*go y

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2.在[mysqld]下添加一行 skip-grant-tables，然后保存并退出51Testing软件测试网,t&]}r/V0v5G

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[mysqld]51Testing软件测试网 B(}.L#R6a$[

#51Testing软件测试网.`MliE?

# 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_bin51Testing软件测试网,Bv_)q#nF0[?2V(x K

#51Testing软件测试网D0Q A#|_%Uy:z

# 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.51Testing软件测试网$M'@o \~*Zv

# join_buffer_size = 128M51Testing软件测试网tW`\4_/B/DL

# sort_buffer_size = 2M

# read_rnd_buffer_size = 2M51Testing软件测试网v Rh_2B+hP'of wUe

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

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

symbolic-links=0

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log-error=/var/log/mysqld.log51Testing软件测试网X$P Gh2hRmpF

pid-file=/var/run/mysqld/mysqld.pid

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# ADD free password by idoxu (isTester.com)

skip-grant-tables      # IDO老徐注：新增这行51Testing软件测试网6d+V
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~                                                                                                                                      

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3.重启mysql服务：service mysqld restart

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[root@isTester ~]# service mysqld restart51Testing软件测试网 q+X,Np)k4sP

Redirecting to /bin/systemctl restart mysqld.service51Testing软件测试网,lY1b+KW*AD

[root@isTester ~]# 

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4.更改root密码51Testing软件测试网t_*Cr$I{&j|,r-S

重启以后，执行mysql命令进入mysql命令行（上面已经设置了跳过密码，不用输入密码）

[root@isTester ~]# mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.51Testing软件测试网O7C)ptO5V"q'D,A)j9S

Your MySQL connection id is 251Testing软件测试网(by!vF1D9EO

Server version: 5.7.30 MySQL Community Server (GPL)

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

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Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.51Testing软件测试网*d9WsLqejQ4I

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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mysql> 51Testing软件测试网Ty:N2G8@VwD

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5.修改root用户密码51Testing软件测试网g'^ _#q!fK!i

》参考文章51Testing软件测试网0oB
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6.把/etc/my.cnf中的skip-grant-tables注释掉51Testing软件测试网!MG ihhG

参考第2步51Testing软件测试网w K1}+V5vP6Bs[

# ADD free password by idoxu (isTester.com)51Testing软件测试网/[!nG7tec)^&X9Z

# skip-grant-tables      # IDO老徐注：前面新增一个 “#” 注释掉这行

~     

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7.重启mysql51Testing软件测试网(_Ti7Y+y%t'q

参考第3步51Testing软件测试网@.qY` F-t

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搞定，51Testing软件测试网"OK){#U4y-DP.g'E!]

可以用root新的密码登录了51Testing软件测试网 HPK2I`zPJ)[