ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

本机登陆mysql数据库，报以下错误：

# mysql -u root -p 
Enter password: 
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

其它方式登陆尝试：

# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
# mysql -u root -h localhost -p 
Enter password: 
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
# mysql -u root -h 127.0.0.1 -p 
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.6.25 Source distribution

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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>

从数据库中查看相关信息：

mysql> 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
mysql>  select  Host,user,password from user;
+-----------+------+-------------------------------------------+
| Host      | user | password                                  |
+-----------+------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| 127.0.0.1 | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+-----------+------+-------------------------------------------+
2 rows in set (0.00 sec)

mysql> show variables like 'socket';
+---------------+------------------+
| Variable_name | Value            |
+---------------+------------------+
| socket        | /tmp/mysqld.sock |
+---------------+------------------+
1 row in set (0.00 sec)

mysql> 

查看my.cnf配置文件：

# more /etc/my.cnf 
[client]

[mysqld]
basedir=/usr/local/mysql
datadir=/var/mysql/data
socket=/tmp/mysqld.sock

解决方案：

在my.cnf文件中增加以下记录，然后再次登陆

[client] 
socket  = /tmp/mysqld.sock