步骤1、修改mysql配置文件
[root@localhost ~]# vi /etc/my.cnf
在底部添加一行
skip-grant-tables
保存退出
重启mysql
[root@localhost ~]# systemctl restart mysqld
步骤2、将root密码置空
[root@localhost ~]# mysql -uroot -p
直接回车
mysql> use mysql
mysql> select host, user, authentication_string, plugin from user;
mysql> update user set authentication_string=‘‘ where user=‘root‘;
mysql> \q
步骤3、改回mysql配置文件
返回步骤1，将添加的一行删或注释掉，保存退出，重启mysql.
[root@localhost ~]# vi /etc/my.cnf
#skip-grant-tables
[root@localhost ~]# systemctl restart mysqld
步骤4、修改root密码
[root@localhost ~]# mysql -uroot -p
直接回车
mysql> ALTER USER ‘root‘@‘%‘ IDENTIFIED BY ‘MyNewPass4!‘;
mysql> select host, user, authentication_string, plugin from user; +-----------+------------------+------------------------------------------------------------------------+-----------------------+ | host | user | authentication_string | plugin | +-----------+------------------+------------------------------------------------------------------------+-----------------------+ qH%eL3@wUvYXiOmjuqkVggHwIwYIWZA3.0kpC1HjNaGWxM7EH51cB | caching_sha2_password | | % | userbook | *59B1E18AA534B3A2E3A33430582E9EE06AF3B729 | mysql_native_password | | localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password | | localhost | mysql.session | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password | | localhost | mysql.sys | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED | caching_sha2_password | +-----------+------------------+------------------------------------------------------------------------+-----------------------+ 5 rows in set (0.00 sec)
这时会出现如下显示格式不正确的情况。
（思路：
可通过先将%设置为localhost，
再执行，
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘MyNewPass4!‘;
将localhost设置为%，
mysql> update user set host=‘%‘ where user=‘root‘;
然后，
mysql> flush privileges;
解决。）