Node.js+Nginx 抛出 502 bad gateway 错误

Question

我刚刚将 Node.js 应用程序安装到开发环境中。配置是: 乌类图16.x PHP 7.0 Node.js 8.x mysql phpMyAdmin nginx

我的 Node 应用程序使用端口 2000，子文件夹名称为 nodeapp。尽管 phpmyadmin 正常打开，但 Node 应用程序给出 502 Bad gateway。

这是 nginxconf 文件:

server {
    listen 80 default_server;
    listen [::]:80 default_server;
        listen 2000;

    root /home/pjsp/public_html;
    index index.php index.html index.htm index.nginx-debian.html app.js;

    server_name mydomain.com;

    location /nodeapp {
    proxy_pass http://localhost/nodeapp:2000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
}
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }

}

下面是我在/var/log/nginx/error.log 文件中遇到的错误:

2018/06/02 13:13:15 [error] 32209#32209: *763 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 127.0.0.1, server: mydomain.com, request: "GET /nodeapp:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000

请帮忙!

Update:

新配置文件:

server {
    listen 80 default_server;
    listen [::]:80 default_server;
        #listen 2000;

    root /home/pjsp/public_html;
    index index.php index.html index.htm index.nginx-debian.html app.js;

    server_name app.pajasa.com www.app.pajasa.com;

    location /nodeapp {
    proxy_pass http://localhost;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
}
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }

}

现在出现错误:

2018/06/02 14:52:35 [alert] 3026#3026: *765 768 worker_connections are not enough while connecting to upstream, client: 127.0.0.1, server: app.pajasa.com, request: "GET /nodeapp:2000 HTTP/1.1", upstream: "http://127.0.0.1:80/nodeapp:2000", host: "www.app.pajasa.com"

网址:www.app.pajasa.com/nodeapp:2000

Answer 1

你的 nginx 中有一个无限循环。这就是为什么你会看到:

/nodeapp:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000:2000....

如果您的 Node 应用程序正在监听端口 2000，请不要在 Nnginx 上使用 listen 2000;。

删除该请求后，请求:http://localhost/nodeapp 将传递到您的 Node 应用程序上。

此外，您的 proxy_pass 不正确，应该是:

 proxy_pass http://localhost:2000;

更新

您的网址错误

www.app.pajasa.com/nodeapp:2000 // INCORRECT

首先，正如我们已经提到的，如果您使用 Nginx 代理 Node.js 应用程序，则不必在 URL 上添加端口，其次，更重要的是，这不是端口的工作方式:

www.app.pajasa.com:2000 // This is correct

从 URL 中删除 :2000，Nginx 会将其代理到您的 Node 应用程序。

www.app.pajasa.com/nodeapp