Linux 7以上版本安裝與卸載Mysql5.7

1.安裝可能出現的問題:
請看:https://blog.csdn.net/u011886447/article/details/79796802
2.卸載mysql
請看:https://blog.csdn.net/tjcyjd/article/details/52189182
3.卸載後運行出現的問題:
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)
請看:http://www.68idc.cn/help/mysqldata/mysql/20140720117666.html