首先 打开配置文件 vim /etc/my.cnf
并在[mysql]下面加上
skip-grant-tables
然后重启mysql
service mysqld restatus #重启
更新密码
UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
#最新mysql
UPDATE user SET authentication_string=PASSWORD('newpassword') where USER='root';
#如果提示user 不存在 就替换为 mysql.user
刷新
FLUSH PRIVILEGES;
退出
quit;如下所示
mysql> UPDATE user SET authentication_string=PASSWORD('123456') where USER='root';
ERROR 1046 (3D000): No database selected
mysql> UPDATE mysql.user SET authentication_string=PASSWORD('123456') where USER='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
mysql> quit;
出现如下问题
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql>
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> alter user 'root'@'localhost' identified by '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
解决办法
vim /etc/my.cnf
在文件末尾添加以下内容：
plugin-load=validate_password.so
validate-password=OFF
# For advice on how to change settings please see
# http://dev.mysql***/doc/refman/5.7/en/server-configuration-defaults.html
[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
#skip-grant-tables
# 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
plugin-load=validate_password.so
validate-password=OFF
重启 service mysqld restart
mysql> alter user 'root'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
mysql> exit;
由此便解决了
