错误2002 (HY000):无法通过socket '/var/lib/ MySQL / MySQL .sock'连接到本地MySQL服务器

I have installed Centos7 update, removed MariaDB and done a fresh install of MySQL - additionally I have removed it and reinstalled it but everytime I connect to mysql -u root -p I get the titled error. Additionally I I have installed Centos7 update, removed MariaD