Question

我正在将Nginx配置为内部Gunicorn服务器的面向公众的代理服务器，以托管我正在开发的“ Reddit clone” Flask项目。有一次，Nginx正常工作（当我使用与在线教程基本相同的配置时），但是在进行适合我的应用程序的更新后，导航到我的Amazon Lightsail时出现“内部服务器错误”（ Ubuntu 16.04）服务器的IP地址，并将更改恢复为教程配置现在不起作用。

我尝试过：
1.停止并启动Nginx服务
2.运行sudo netstat -tulpn，找到PID（对于本地地址0.0.0.0:80和0.0.0.0:443似乎出现两次），用sudo fuser -k 80/tcp和sudo fuser -k 443/tcp终止进程，然后然后再次启动Nginx
3.从我的系统中完全删除Nginx并重新安装： sudo apt-get purge --auto-remove nginx sudo apt-get -y install nginx

flask_reddit（我在/etc/nginx/sites-enabled/中的配置文件）：

# write access and error logs to /var/log
access_log /var/log/nginx/flask_reddit/flask-reddit_access.log;
error_log /var/log/nginx/flask_reddit/flask-reddit_error.log;

server {
    # As Gunicorn documentation states, prevent host spoofing by blocking requests without "Host" request header set
    listen 80;
    listen 443; 
    server_name "";
    return 444;
}

server {
    # listen on port 80 (http)
    listen 80 default_server;
    server_name _;
    location / {
        # redirect any requests to the same URL but on https
        return 301 https://$host$request_uri;
    }
}
server {
    # listen on port 443 (https)
    listen 443 ssl default_server;
    server_name _;
    client_max_body_size 5m; # Useful for situations such as file uploads; will return 413 code in violation of this limit
    keepalive_timeout 120s 120s; # Used to expedite request processing

    # location of the self-signed SSL certificate
    ssl_certificate /home/ubuntu/flask-reddit/certs/cert.pem;
    ssl_certificate_key /home/ubuntu/flask-reddit/certs/key.pem;

    location / {
        # forward application requests to the gunicorn server
        proxy_pass http://localhost:8000;
        proxy_redirect off; # Preserve the fact that Gunicorn handled the request by disabling proxy_pass->location URL prefix change
        proxy_set_header Host $host; # When a domain name is configured, this will equal the name in lowercase with no port (protocol added in X-Forwarded-Proto)
        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;
    }

    location /static {
        # handle static files directly, without forwarding to the application
        root /home/ubuntu/flask-reddit/app;
        try_files $uri /templates/404.html; # Provide custom-written 404 response page
        expires 30d;
    }
}

运行sudo service nginx status时，得到以下输出：

● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/nginx.service.d
           └─override.conf
   Active: active (running) since Thu 2019-08-29 04:07:42 UTC; 22h ago
  Process: 4744 ExecStopPost=/bin/rm -f /run/nginx.pid (code=exited, status=0/SUCCESS)
  Process: 4741 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=1/FAILURE)
  Process: 5678 ExecReload=/usr/sbin/nginx -g daemon on; master_process on; -s reload (code=exited, status=0/SUCCESS)
  Process: 4856 ExecStartPost=/bin/sleep 0.1 (code=exited, status=0/SUCCESS)
  Process: 4852 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
  Process: 4849 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
 Main PID: 4855 (nginx)
    Tasks: 2
   Memory: 2.7M
      CPU: 309ms
   CGroup: /system.slice/nginx.service
           ├─4855 nginx: master process /usr/sbin/nginx -g daemon on; master_process on
           └─5681 nginx: worker process                           

Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

如过去所见，如果我导航到服务器的公共IP地址，我很难弄清是什么阻碍了Nginx为我的应用程序提供服务，并且可以使用一些帮助。

如何解决nginx内部服务器错误

0 个答案: