如何使用Nginx + Rails + Unicorn避免502錯誤的網關？

Question

我每天都有相同的502錯誤，但找不到原因。

2014/12/22 16:33:03 [error] 1697#0: *331 upstream prematurely closed connection while reading response header from upstream, client: 105.121.243.92, server: server01.domain.com, request: "GET /doco/in_documents HTTP/1.0", upstream: "http://unix:/tmp/unicorn.docs.sock:/doco/in_documents", host: "go.domain.com:443" 
2014/12/22 16:33:05 [error] 1697#0: *331 connect() failed (111: Connection refused) while connecting to upstream, client: 105.121.243.92, server: server01.domain.com, request: "GET /doco/in_documents HTTP/1.0", upstream: "http://10.213.0.46:80/doco/in_documents", host: "go.domain.com:443" 
2014/12/22 16:33:09 [error] 1697#0: *334 upstream prematurely closed connection while reading response header from upstream, client: 10.212.255.3, server: server01.domain.com, request: "GET /doco/in_documents HTTP/1.1", upstream: "http://unix:/tmp/unicorn.docs.sock:/doco/in_documents", host: "server01.domain.com" 
2014/12/22 16:33:09 [error] 1697#0: *334 connect() failed (111: Connection refused) while connecting to upstream, client: 10.212.255.3, server: server01.domain.com, request: "GET /doco/in_documents HTTP/1.1", upstream: "http://10.213.0.46:80/doco/in_documents", host: "server01.domain.com" 
2014/12/22 16:33:15 [info] 1697#0: *333 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 
2014/12/22 16:33:15 [info] 1697#0: *335 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 
2014/12/22 16:33:15 [info] 1697#0: *336 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 
2014/12/22 16:33:15 [info] 1697#0: *338 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 
2014/12/22 16:33:15 [info] 1697#0: *337 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 
2014/12/22 16:33:17 [info] 1697#0: *334 epoll_wait() reported that client prematurely closed connection, so upstream connection is closed too while sending request to upstream, client: 10.212.255.3, server: server01.domain.com, request: "GET /doco/in_documents HTTP/1.1", upstream: "http://unix:/tmp/unicorn.docs.sock:/doco/in_documents", host: "server01.domain.com" 
2014/12/22 16:33:19 [info] 1698#0: *343 epoll_wait() reported that client prematurely closed connection, so upstream connection is closed too while sending request to upstream, client: 105.121.243.92, server: server01.domain.com, request: "GET /doco/in_documents HTTP/1.0", upstream: "http://unix:/tmp/unicorn.docs.sock:/doco/in_documents", host: "go.domain.com:443" 
2014/12/22 16:33:35 [info] 1698#0: *347 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 
2014/12/22 16:33:35 [info] 1698#0: *346 client closed connection while waiting for request, client: 10.212.255.3, server: 0.0.0.0:80 

任何想法如何避免這種情況？我嘗試了另一個問題的不同方式，但沒有任何效果。

Answer 1

根據您的錯誤日誌和返回的狀態（502），有一件事是確保您的上游服務器不迴應答覆。我建議你檢查你的上游配置，地址，端口或其他東西。