mysql报错Can't connect to local MySQL server through socket '/usr/local/mysql/mysql/mysql.sock' (2)

一开始我用easyswoole测试连接数据库的，报连接失败，然后我自己在ssh那尝试用命令行先连接看看，就报了下面这个错

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

想起上次也是这个报错，啥问题呢，lsof -i:3306看没有？！启动呗service mysql start就OK了