[英]Flask with gunicorn on nginx 502 bad gateway error
經過一些ubuntu 16.04升級和應用程序代碼修改后,以前在gunicorn和nginx網站上運行的Flask現在出現502錯誤的網關錯誤。
myapp.conf:
upstream app_server_wsgiapp {
server localhost:8000 fail_timeout=0;
}
server {
listen 80;
server_name www.myserver.com;
access_log /var/log/nginx/www.myapp.access.log;
error_log /var/log/nginx/www.myapp.error.log info;
keepalive_timeout 5;
location /static {
autoindex on;
alias /myapp/static;
}
location / {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
if (!-f $request_filename) {
proxy_pass http://app_server_wsgiapp;
break;
}
client_max_body_size 2097152;
#to get around upstream sent too big header while reading response header from upstream error
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
}
# this section allows Nginx to reverse proxy for websockets
location /socket.io {
proxy_pass http://app_server_wsgiapp/socket.io;
proxy_redirect off;
proxy_buffering off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
}
}
/var/log/nginx/myapp.error.log
2017/06/11 06:42:52 [error] 31054#31054: *1 connect() failed (111: Connection refused) while connecting to upstream, client: clientip, server: www.myserver.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "www.myapp.com"
從我的應用程序日志文件中,我注意到Flask是啟動過程的一部分,然后以連續的失敗/重新啟動循環重新啟動。
關於如何調試可能導致此問題的任何想法?
看來問題是由flask應用運行錯誤引起的。 您可以嘗試以交互方式運行該應用程序嗎? 在守護程序方式下使用相同的參數和環境設置,並檢查服務是否可以正確啟動?
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