如何正确配置 nginx 以在 Digital Ocean 上的 Ubuntu 16.04 上使用 rails

Question

我决定在我管理的网站上安装最新的 ubuntu 16.04 系统，结果却接二连三地出现问题。我的 mysql 服务器出现了问题，我不确定是否已经完全修复，因为有时我会遇到 mysql 连接错误。我放弃了设置 spam assasin。但我至少希望网站能像以前一样运行。我遇到了这些奇怪的 nginx 错误，我无法理解。过去，我能够成功部署各种 rails 应用程序，而不会出现重大问题。但在这里，我陷入了无可救药的困境。我的网站大部分功能正常，但有些链接却无法使用。http://chrisbeard-images.com/photos?tag=Bridges

它们在本地开发机器上似乎运行良好，在我重新安装系统之前也完全正常。

$ tail log/nginx.error.log 给出了我无法理解的错误

2016/06/20 21:01:34 [info] 17909#17909: *41 client closed connection while waiting for request, client: 86.22.165.132, server: 0.0.0.0:80

$ 尾日志/nginx.access.log

86.22.165.132 - - [20/Jun/2016:20:48:24 -0400] "GET /photos?tag=Bridges HTTP/1.1" 500 643 "http://chrisbeard-images.com/tags“Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.0”

$ cat /etc/nginx/nginx.conf

user www-data;
worker_processes 4;
pid /var/run/nginx.pid;

events { worker_connections 1024; }

http {
        client_max_body_size 2048M;
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    server_tokens off;

    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    gzip on;
    gzip_disable "msie6";
    gzip_types text/plain text/xml text/css text/comma-separated-values;
        upstream app_server { server 127.0.0.1:8080 fail_timeout=0; }

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}

$ cat /etc/nginx/sites-enabled/default

upstream puma {
  server unix:///home/chris/Rails/chrisbim2ree/shared/tmp/sockets/chrisbim2ree-puma.sock;
}

server {
  listen 80 default_server deferred;
  # server_name example.com;

  root /home/chris/Rails/chrisbim2ree/current/public;
  access_log /home/chris/Rails/chrisbim2ree/current/log/nginx.access.log;
  error_log /home/chris/Rails/chrisbim2ree/current/log/nginx.error.log info;

  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  try_files $uri/index.html $uri @puma;
  location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    proxy_pass http://puma;
  }

  error_page 500 502 503 504 /500.html;
  client_max_body_size 10M;
  keepalive_timeout 10;
}