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NGINX 502 Bad Gateway Connect() 连接上游时失败（133：没有到主机的路由）

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NGINX 502 Bad Gateway Connect() 连接上游时失败（133：没有到主机的路由）

介绍

您好，我在为测试网站设置 Nginx 时遇到了问题。我有一个主机和一个虚拟机，虚拟机上的 docker 应用程序在端口 3000 上运行。

问题

现在当我执行 192.168.1.22:4444 (HOST MACHINE) 时，会出现 502 Bad Gateway。此外，似乎没有数据包到达我设置的 VM。

tcpdump -i eth0 'port 4444'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
2 packets received by filter
0 packets dropped by kernel

但是现在当我在浏览器中输入虚拟机的 IP（172.16.1.22）和服务端口（4444）时，我会收到数据包。

14:49:46.860869 IP .3458 > .4444: Flags [.], ack 1, win 229, options [nop,nop,TS val 211139829 ecr 9802156], length 0
14:49:46.860911 IP .3458 > .4444: Flags [.], ack 1, win 229, options [nop,nop,TS val 211139829 ecr 9802157], length 0
14:49:46.861545 IP .3458 > .4444: Flags [P.], seq 492:944, ack 244, win 237, options [nop,nop,TS val 211139829 ecr 9802133], length 452
14:49:46.862192 IP .3458 > .4444: Flags [P.], seq 1:451, ack 1, win 229, options [nop,nop,TS val 211139830 ecr 9802156], length 450
14:49:46.862248 IP .3458 > .4444: Flags [P.], seq 1:450, ack 1, win 229, options [nop,nop,TS val 211139830 ecr 9802157], length 449
14:49:46.862306 IP .4444 > .4444: Flags [.], ack 451, win 235, options [nop,nop,TS val 9802158 ecr 211139830], length 0

问题

我是否遗漏了某个配置，或者有人可以建议我如何解决这个问题？

Nginx /etc/nginx/conf.d/default.conf

http{
        server {
        listen       4444;
        server_name  vm3;

                location / {
                        proxy_pass http://172.16.1.22;
                        # re-send the host header - this may not be necessary
                        proxy_set_header Host $host;
                        # set the X-Forwarded-For header, so that the public IP of the client is available to the backend server
                        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                }
        }
}

/var/log/nginx/error.log

2019/05/26 17:09:02 [error] 12276#12276: *81 connect() failed (113: No route to host) while connecting to upstream, client: 192.168.1.22, server: _, request: "GET / HTTP/1.1", upstream: "http://172.16.1.22:80/", host: "192.168.1.10:32322"

答案1

确保指定上游端口。

http{
        server {
        listen       4444;
        server_name  vm3;

                location / {
                        proxy_pass http://172.16.1.22:3000;
                        # re-send the host header - this may not be necessary
                        proxy_set_header Host $host;
                        # set the X-Forwarded-For header, so that the public IP of the client is available to the backend server
                        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                }
        }
}

答案2

就我而言，端口已关闭，我通过 telnet 检查，配置防火墙后，错误消失

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