MySQL 'root'@'localhost'无法登录

今天早上同事说MySQL root账号登录不上了。我试了一下
#mysql -u root -p
提示”Access denied for user ‘root’@’localhost’ (using password: YES)”

因为年后有同事离职,我第一反应是谁修改了root密码?按照忘记root密码来重置一下密码:
#/etc/init.d/mysql stop
#mysqld_safe –skip-grant-tables &
#mysql -uroot -p
mysql>update mysql.user set password=password(‘mypassword’) where user=’root’;
mysql>flush privileges;
mysql>quit

用新密码还是无法登录,提示跟上面一样。换一个非root账号登录,查看一下user表:
mysql> select user,host from user;
+———–+———+
| user   | host |
+———–+———+
| root  | 127.0.0.1 |
| night | % |
+———–+———+

怀疑默认的localhost没有映射到127.0.0.1?试试#mysql -u root -p xxxx -h 127.0.0.1,果然可以登录。
之前配置数据库的同学没有给’root’@’localhost’和’root’@’ip’授权。
grant all privileges on . to ‘root’@’localhost’ identified by ‘mypassword’ with grant option;
grant all privileges on . to ‘root’@’118.192.91.xxx’ identified by ‘mypassword’ with grant option;

再查询一下用户表:
MySQL 'root'@'localhost'无法登录_第1张图片
然后#mysql -u root -p xxxx,登录成功!

查了一下mysql -h localhost和mysql -h 127.0.0.1的区别,通过localhost连接到mysql是使用UNIX socket,而通过127.0.0.1连接到mysql是使用TCP/IP。看看状态:
mysql -h localhost > status
Connection id:     639
Current database: mysql
Current user:   root@localhost
SSL:           Not in use
Current pager: stdout
Using outfile:        ”
Using delimiter:    ;
Server version:     5.6.15-log Source distribution
Protocol version: 10
Connection:    Localhost via UNIX socket

mysql -h 127.0.0.1 > status
Connection id:     640
Current database: mysql
Current user:   root@localhost
SSL:           Not in use
Current pager: stdout
Using outfile:        ”
Using delimiter:    ;
Server version:     5.6.15-log Source distribution
Protocol version: 10
Connection:   127.0.0.1 via TCP/IP

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