从上游 Ruby 项目读取响应标头时，上游过早关闭连接答案

【问题标题】：Upstream prematurely closed connection while reading response header from upstream Ruby project从上游 Ruby 项目读取响应标头时，上游过早关闭连接
【发布时间】：2018-03-27 08:44:30
【问题描述】：

我正在尝试使用 NGINX 在 GCP 上反向代理一个 ruby 项目，我的 /etc/nginx/sites-available/default 文件看起来像这样

 server {
     large_client_header_buffers 4 16k;
     listen 80 default_server;
     #server_name my-devops-staging.com  
     listen [::]:80 default_server;
     #return 301 https://$host$request_uri;
     # SSL configuration
     #
     listen 443 ssl default_server;
     listen [::]:443 ssl default_server;
     ssl_certificate           /etc/nginx/certificate.crt;
     ssl_certificate_key       /etc/nginx/key.key;
     ssl off;
     ssl_session_cache  builtin:1000  shared:SSL:10m;
     ssl_protocols  TLSv1 TLSv1.1 TLSv1.2;
     ssl_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4;
     ssl_prefer_server_ciphers on;
     # Note: You should disable gzip for SSL traffic.
     # See: https://bugs.debian.org/773332
     #
     # Read up on ssl_ciphers to ensure a secure configuration.
     # See: https://bugs.debian.org/765782
     #
     # Self signed certs generated by the ssl-cert package
     # Don't use them in a production server!
     #
     # include snippets/snakeoil.conf;
     root /var/www/html;
     # Add index.php to the list if you are using PHP
     index index.html index.htm index.nginx-debian.html;
     location / {
         proxy_set_header        Host $server_name;
         proxy_set_header        X-Real-IP $remote_addr;
         proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header        X-Forwarded-Proto $scheme;
         # Fix the “It appears that your reverse proxy set up is broken" error.
         proxy_pass http://localhost:8080;
         # proxy_read_timeout 300;
         proxy_read_timeout  9000;
         proxy_request_buffering off;
         proxy_buffering off;
         proxy_redirect off;
     }
}

每当我运行时，我可能做错了什么

$ sudo service nginx restart

我在error.log 中收到这些错误

2018/03/27 08:32:50 [error] 2959#2959: *64 upstream prematurely closed connection while reading response header from upstream, client: 130.211.2.175, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8080/", host: "my-devops-staging.com" 
2018/03/27 08:32:53 [error] 2959#2959: *66 upstream prematurely closed connection while reading response header from upstream, client 130.211.2.87, server: , request: "GET / HTTP/1.1", upstream: http://127.0.0.1:8080/", host: "my-devops-staging.com"

【问题讨论】：

标签： ruby-on-rails nginx google-cloud-platform

【解决方案1】：

通过将这些参数添加到您的代理 Nginx 配置文件中，使您的代理和后端之间的通信更加忠诚：

location / {

    proxy_http_version 1.1;  # you need to set this in order to use params below.

    proxy_temp_file_write_size 64k;
    proxy_connect_timeout 10080s;
    proxy_send_timeout 10080;
    proxy_read_timeout 10080;
    proxy_buffer_size 64k;
    proxy_buffers 16 32k;
    proxy_busy_buffers_size 64k;
    proxy_redirect off;
    proxy_request_buffering off;
    proxy_buffering off;
    proxy_pass <whatever_here>;
}

我从适合我们的生产环境中获得的神奇数字。您可能需要考虑更改这些数字以适应您的环境和连接数等。

我希望这会有所帮助。

【讨论】：

你的环境好吗？

【解决方案2】：

您实际上在连接到您的 Rails 应用程序时超时，您可以将 proxy_read_timeout 降低到 300 并提高您的 proxy_connect_timeout 以匹配它，或者如果它继续发生，则更高。只需在 location \ {...} 块中添加这些行：

 location / {
     proxy_set_header        Host $server_name;
     proxy_set_header        X-Real-IP $remote_addr;
     proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header        X-Forwarded-Proto $scheme;
     proxy_pass http://localhost:8080;
     proxy_read_timeout 300; # Reducing this
     proxy_connect_timeout 300;  # Adding this
     proxy_request_buffering off;
     proxy_buffering off;
     proxy_redirect off;
 }

【讨论】：