今天安装lnmp环境后用mysql -u root -p连接密码后出现错误：
Access denied for user 'root'@'localhost' (using password: YES)
然后我就用 /etc/init.d/mysql stop 先去停止数据库。
然后用安全模式 mysqld_safe --user=mysql --skip-grant-tables --skip-networking & 进入数据库。
然后用SQL语句修改root权限 UPDATE user SET Password=PASSWORD('我的密码') where USER='root';
改完了后 重新刷新权限 FLUSH PRIVILEGES; 然后quit退出。
然后重启数据库就行了，/etc/init.d/mysql restart
[root@967b0e11e627 default]# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
[root@967b0e11e627 default]# /etc/init.d/mysql stop
Shutting down MySQL. SUCCESS!
[root@967b0e11e627 default]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
[1] 91761
[root@967b0e11e627 default]# 160618 11:54:54 mysqld_safe Logging to '/usr/local/mysql/var/967b0e11e627.err'.
160618 11:54:55 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var
[root@967b0e11e627 default]# mysql -u root mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.48-log Source distribution
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.02 sec)
mysql> UPDATE user SET Password=PASSWORD('Weiwend&20150125') where USER='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
mysql> quit
Bye
[root@967b0e11e627 default]# /etc/init.d/mysql restart
Shutting down MySQL.160618 11:55:53 mysqld_safe mysqld from pid file /usr/local/mysql/var/967b0e11e627.pid ended SUCCESS!
Starting MySQL.. SUCCESS!
[1]+ Done mysqld_safe --user=mysql --skip-grant-tables --skip-networking
[root@967b0e11e627 default]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.48-log Source distribution
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)
mysql> exit
Bye