Google Cloud Compute Engine上的Flask + NGINX + UWSGI提供了502错误的网关

Question

我正在尝试在Google Cloud上运行的NGINX服务器上设置Pybossa（使用Flask构建的web应用程序）（此教程仅供参考）。 我认为我正在使用的虚拟主机文件有问题，因为一旦启用它，服务器就会返回502错误的网关。 Google Compute Engine VM实例正在运行Debian 8。

完整的主机文件在这里：

 server { listen 80; server_name _; large_client_header_buffers 4 32k; real_ip_header X-Forwarded-For; # change that to your pybossa directory root /home/pybossa/pybossa; client_max_body_size 5M; if (-f /home/pybossa/pybossa/503.html) { return 503; } error_page 503 @maintenance; location / { try_files $uri @pybossa; } location @pybossa { include uwsgi_params; uwsgi_pass unix:/tmp/pybossa.sock; } location /static { # change that to your pybossa static directory alias /home/pybossa/pybossa/pybossa/themes/default/static; autoindex on; expires max; } location ~ /api/app { rewrite ^/api/app /api/project$1 permanent; } location ~ /app { rewrite ^/app(.*) /project$1 permanent; } error_page 503 @maintenance; location @maintenance { if ($uri !~ ^/static/) { rewrite ^(.*)$ /503.html break; } } } 

和uwsgi配置文件：

 [uwsgi] socket = /tmp/pybossa.sock chmod-socket = 666 chdir = /home/pybossa/pybossa pythonpath = .. virtualenv = /home/pybossa/pybossa/env module = run:app cpu-affinity = 1 processes = 2 threads = 2 stats = /tmp/pybossa-stats.sock buffer-size = 65535 

我最初设置了自己的NGINX服务器，但该服务器无法正常工作。 现在，我在由Google云部署的NGINX服务器中运行它，在我在`/ etc / nginx / sites-enabled /中启用虚拟主机文件之前，它可以正常工作。

/var/log/nginx/error.log包含以下内容：

 2017/08/16 21:53:30 [alert] 439#0: *21 open socket #13 left in connection 4 2017/08/16 21:53:30 [alert] 439#0: *21 open socket #13 left in connection 4 2017/08/16 21:53:30 [alert] 439#0: aborting 2017/08/16 21:53:32 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:13 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:14 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:14 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:35 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:36 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:37 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 21:54:51 [crit] 16744#0: *1 connect() to unix:/tmp/pybossa.sock failed (2: No such file or directory) while connecting to upstream, client: 68.107.113.211, server: _, reques t: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 

我是Web应用程序开发的新手，以前没有使用过Flask或NGINX。 感谢我可以获得的任何帮助。

更新：修复了uwsgi不在运行的问题后，现在错误日志显示

 2017/08/16 23:53:27 [alert] 23944#0: *26 open socket #7 left in connection 3 2017/08/16 23:53:27 [alert] 23944#0: aborting 2017/08/16 23:53:30 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 23:53:30 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 23:53:31 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 23:53:31 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 23:53:31 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 23:54:29 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 2017/08/16 23:54:30 [error] 24536#0: *1 connect() to unix:/tmp/pybossa.sock failed (111: Connection refused) while connecting to upstream, client: 68.107.113.211, server: _, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/tmp/pybossa.sock:", host: "35.184.197.200" 

Answer 1

日志中说没有这样的文件或目录是因为您尚未在Nginx config设置套接字，请尝试添加它，如下所示：

 location / {
            proxy_pass http://unix:/tmp/pybossa.sock

Answer 2

检查uwsgi错误日志。 它应该说出为什么还是失败或返回500。此外，还要仔细检查套接字是使用适当的权限创建的，以便nginx可以连接到它。