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

    用XAMPP装装好mysql之后，mysql -uroot 连不上，报这个错误：

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

    在mysql的配置文件里，/opt/lampp/etc/my.cnf， 发现了这样的配置：

# The following options will be passed to all MySQL clients
[client]
#password       = your_password
port            = 3306
socket          = /opt/lampp/var/mysql/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
user            = nobody
port            = 3306
socket          = /opt/lampp/var/mysql/mysql.sock

    原来mysql用的套接字文件是：/opt/lampp/var/mysql/mysql.sock于是建立了个软连接， 命令如下。不能建立硬链接，不知道为什么。

    ln -s /opt/lampp/var/mysql/mysql.sock  /var/run/mysqld/mysqld.sock

    现在可以用mysql -uroot命令登陆上了~