Docker: proxy_pass to another container - nginx: host not found in upstream

Question

(I know others have asked this question before, but I\'m not able to solve the problem using the solutions proposed in other posts, so i figured i would try to post my c

Answer 1

It's simple. Just change the old configuration:

upstream docker-web {
    server web:8000;
}

To this new one:

upstream docker-web {
    server web:80;
}

The reason is, between containers can't communicate with published port. It just can communicate with the target port. 8000:80 (8000 is published port and 80 is target port).

Let say you have 8000:443, you must create the configuration with "server web:443" inside Nginx listen to 443 port number. May this help.