docker解决Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

今天用docker装mysql，连接时报这个错：

Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’
网上找了很久，终于找到解决办法：
mysql -h 127.0.0.1 -P 3306 -u root -p回车后输入密码即可登陆成功。