mysql错误ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'MAC'解决办法
MariaDB [(none)]> create database MAC;
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'MAC'
MariaDB [(none)]>
方法一：
1.关闭mysql
# service mysqld stop 【 备注centos7是systemctl stop mariadb】
2.屏蔽权限
# mysqld_safe --skip-grant-table
屏幕出现： Starting demo from .....
3.新开起一个终端输入
#mysql -uroot -pxxxxxx
MariaDB [(none)]> use mysql;
MariaDB [mysql]>
MariaDB [mysql]> UPDATE user SET Password=PASSWORD('newpassword') where USER='root'; 【备注：下一次会用newpassword密码登录数据库】
MariaDB [mysql]> FLUSH PRIVILEGES;//记得要这句话，否则如果关闭先前的终端，又会出现原来的错误
MariaDB [mysql]> \q
----------------------------------------------------------------------------
我的实操测试
[root@nessus ~]# systemctl stop mysqld
Failed to stop mysqld.service: Unit mysqld.service not loaded.
[root@nessus ~]# systemctl stop mariadb
[root@nessus ~]#
[root@nessus ~]#
[root@nessus ~]# mysqld_safe --skip-grant-table
191030 11:11:24 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
191030 11:11:24 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
新开起一个终端输入
[root@nessus ~]# mysql -uroot 【我的无密码】
MariaDB [(none)]> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [mysql]> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4 Changed: 4 Warnings: 0
MariaDB [mysql]>
MariaDB [mysql]>
MariaDB [mysql]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]> \q
Bye
[root@nessus ~]# mysql -uroot 【发现之前无密码无法登陆了】
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[root@nessus ~]#
[root@nessus ~]# mysql -uroot -pnewpassword 【得用newpassword密码登录数据库】
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.60-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
MariaDB [(none)]>
MariaDB [(none)]>
MariaDB [(none)]> create database MAC;
Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]>
MariaDB [(none)]>
MariaDB [(none)]>
MariaDB [(none)]>
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