laravels + laradock nginx 502

1. 报错如下

2018/09/02 15:24:31 [error] 9#9: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.28.0.1, server: laravel.test, request: "GET / HTTP/1.1", upstream: "http://172.28.0.7:5200/", host: "laravel.test"

2. 解决方案

https://github.com/hhxsv5/laravel-s/issues/71#issuecomment-416174603