NGINX 反向代理/端口转发规则将 http 流量发送到我的 Node Express 应用程序的端口 3000 导致应用程序无法使用

Question

我有一个运行 Express 的 Node JS 服务器，它被用作 Web 服务器。 它连接到我的数据库来为最终用户运行查询。

我在 Digital Ocean 上设置了一个 VPS，在端口 3000 上运行了一个 Node 应用程序。当我在 ip:3000 上访问 Node 应用程序时，它运行良好，并且与预期的一样快。 如果我使用 nginx 设置反向代理，或者将流量从端口 80 转发到端口 3000 的防火墙规则，页面的某些部分似乎运行得非常缓慢，或者根本不运行。 我似乎找不到原因的链接，因为有些数据库查询运行良好，但有些根本无法加载并导致页面挂起。 如果我使用端口 3000 访问该站点，该站点仍然可以继续正常运行，即使 nginx 正在运行。 只是从 80 端口的访问速度很慢。

我的 NGINX 配置是：

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

http {

        ##
        # Basic Settings
        ##

        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;

        ##
        # SSL Settings
        ##

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;

        ##
        # Logging Settings
        ##

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

        ##
        # Gzip Settings
          # server_names_hash_bucket_size 64;
        # server_name_in_redirect off;

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

        ##
        # SSL Settings
        ##

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;

        ##
        # Logging Settings
        ##

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

        ##
        # Gzip Settings
        ##

        gzip on;

        # gzip_vary on;
        # gzip_proxied any;
        # gzip_comp_level 6;
        # gzip_buffers 16 8k;
        # gzip_http_version 1.1;
        # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/$
        ##
        # Virtual Host Configs
        ##
server_names_hash_bucket_size 64;
include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;
}


#mail {
#       # See sample authentication script at:
#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#       # auth_http localhost/auth.php;
#       # pop3_capabilities "TOP" "USER";
#       # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
#       server {
#               listen     localhost:110;
#               protocol   pop3;
#               proxy      on;
#       }
#
#       server {
#               listen     localhost:143;
#               protocol   imap;
#               proxy      on;
#       }
#}

我的 example.com 文件是（其中“example.com”是我的网站地址）：

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

    root /var/www/example.com/html;
    index index.html index.htm index.nginx-debian.html;

    server_name example.com www.example.com;

location / {
        proxy_pass http://localhost:3000;
        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;
    }
}

Answer 1

我建议使用 PM2 在生产中启动节点应用程序的实例https://github.com/Unitech/pm2

尝试以下 NGINX 配置

upstream prod_nodejs_upstream {
    server 127.0.0.1:3000;
    keepalive 64;
}

server {
    listen 80;
    server_name example.com;
    root /home/www/example;

    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_max_temp_file_size 0;
        proxy_pass http://prod_nodejs_upstream/;
        proxy_redirect off;
        proxy_read_timeout 240s;
    }
}

应用这些更改后，您必须使用命令sudo nginx -t重新启动 NGINX，然后sudo systemctl restart nginx

Answer 2

请使用如下更新配置并共享文件的输出，以便可以测量上游所花费的时间

upstream prod_nodejs_upstream {
    server 127.0.0.1:3000;
    keepalive 64;
}

server {
    listen 80;
    server_name example.com;
    root /home/www/example;

    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_max_temp_file_size 0;
        proxy_pass http://prod_nodejs_upstream/;
        proxy_redirect off;
        proxy_read_timeout 240s;
    }

    log_format apm '"$time_local" client=$remote_addr '
               'method=$request_method request="$request" '
               'request_length=$request_length '
               'status=$status bytes_sent=$bytes_sent '
               'body_bytes_sent=$body_bytes_sent '
               'referer=$http_referer '
               'user_agent="$http_user_agent" '
               'upstream_addr=$upstream_addr '
               'upstream_status=$upstream_status '
               'request_time=$request_time '
               'upstream_response_time=$upstream_response_time '
               'upstream_connect_time=$upstream_connect_time '
               'upstream_header_time=$upstream_header_time';

}