CentOS Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’

如果仅仅只yum 安装了mysql这个包，启动mysql时就会提示：
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’

yum安装mysql这个包其实是MySQL 客户端程序和共享库，所以我们还需要安装php-mysql和mysql-server这两个包.

[root@localhost ~] yum install mysql mysql-server php-mysql -y
[root@localhost ~] chkconfig mysqld on
[root@localhost ~] service mysqld start
[root@localhost ~] service httpd restart