mysql,Can 't connect to local MySQL server through socket '/tmp/mysql.sock '(2) "

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

如果只是登陆查询用，可以  # mysql -uroot -h 127.0.0.1 -p  即可,如果要详细参见：
https://blog.csdn.net/hjf161105/article/details/78850658