RROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock'

mysql -uroot -h 127.0.0.1 -p这样可以登录

mysql -u root -p这样登录时提示RROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' 

说的是/tmp/mysql.sock这个文件没有。一般我们安装完了都在/var/lib/mysql/mysql.sock

建立一个软连接：
ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock