migrate エラー SQLSTATE[HY000] [2002] Connection refused

Illuminate\Database\QueryException : SQLSTATE[HY000] [2002] Connection refused

参考url
Illuminate\Database\QueryException : SQLSTATE[HY000] [2002] Connection refused
https://readouble.com/laravel/5.6/ja/migrations.html

https://www.ganbaruyo.net/details/sqlstatehy000-2002-connection-refused-mysql/

https://teratail.com/questions/133881