Ask Nodejs: Docker Nginx 502 Bad Gateway ipv6

Tuesday, 2 May 2017

Docker Nginx 502 Bad Gateway ipv6

Problem

I am attempting to achieve a docker+nginx setup with upstart and a node.js app on one ubuntu server.

I have the node.js app running and I am able to connect to it directly. And the nginx default server worked for me. However, I am encountering 502 bad gateways when trying to link the two. I am wondering if it may be due to my ipv6 node address (not intentional, but shown in netstat below).

Sorry if this is a noob question/config issue. I am new to nginx and ubuntu. I have combed several helpful articles and found neat linux commands, but none of the solutions have worked for me so far.

cat /proc/version:

Linux version 4.4.0-72-generic (buildd@lcy01-24) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #93~14.04.1-Ubuntu SMP Fri Mar 31 15:05:15 UTC 2017

netstat -tpln

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:21            0.0.0.0:*               LISTEN      599/vsftpd
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1305/sshd
tcp        0      0 127.0.0.1:27017         0.0.0.0:*               LISTEN      24199/mongod
tcp6       0      0 :::22                   :::*                    LISTEN      1305/sshd
tcp6       0      0 :::8443                 :::*                    LISTEN      11608/.node.bin
tcp6       0      0 :::80                   :::*                    LISTEN      13646/docker-proxy

nginx.conf

# the IP(s) on which your node server is running. 
upstream app_yourdomain {
    server [::1]:8443;
    keepalive 8;
}

# the nginx server instance
server {
    listen 80;
    server_name [::1];
    rewrite_log on;
    error_log /var/log/nginx/localhost.error_log notice;
    # pass the request to the node.js server with the correct headers
    # and much more can be added, see nginx config options
    location / {
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
      proxy_set_header X-Real-IP $remote_addr;
      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_pass http://app_yourdomain;
      proxy_redirect off;
    }
 }

Error.log

Using server http:// 127.0.0.1:8443 in app_yourdomain

2017/05/02 21:50:22 [error] 5#5: *1 connect() failed (111: Connection refused) while connecting to upstream, client: XXX.XXX.XXX.XX, server: http://XXX.XX.XXX.XXX, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8443/", host: "XXX.XX.XXX.XXX"
2017/05/02 21:50:22 [warn] 5#5: *1 upstream server temporarily disabled while connecting to upstream, client: XXX.XXX.XXX.XX, server: http://XXX.XX.XXX.XXX, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8443/", host: "XXX.XX.XXX.XXX"

Using server [::1]:8443 in app_yourdomain

2017/05/02 22:13:20 [crit] 5#5: *1 connect() to [::1]:8443 failed (99: Cannot assign requested address) while connecting to upstream, client: XXX.XXX.XXX.XX, server: localhost, request: "GET / HTTP/1.1", upstream: "http://[::1]:8443/", host: "XXX.XX.XXX.XXX"

via Justin Reigel

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