mysql5.7以后版本忘记密码找回

说明

系统是centos7,mysql 5.7.21

步骤

找到mysql的配置文件，如果不知道在哪里，打入命令

find / -name my.cnf

修改

vim /etc/my.cnf

后面加入

skip-grant-tables

exp例如

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

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
skip-grant-tables

重启动

systemctl restart mysqld 

再来输入

mysql -uroot

修改你的密码，这个时候5.7版本没有了password 这个字段了

update mysql.user set authentication_string=password('你的密码') where user='root';

这个时候搞定了退出,去掉刚才加的那个

skip-grant-tables

最后重启动mysql

systemctl restart mysqld