docker nginx reverse proxy to gitlab container with built-in nginx give Connection refused

Question

I'm trying to setup a local env using Nginx container as reverse proxy to Jfrog container and Gitlab (with Nginx build in enabled) container, I can access the artifactory container through the Nginx (reverse proxy) but when I'm trying to access the Gitlab container through the Nginx (revrese proxy) I get Connection Refused error.

Here is my Nginx configuration:

upstream gitlab {
    server git.dev.local:8000;
} 
upstream jfrog {
    server jfrog.dev.local:8082;
}

server {
    server_name git.dev.local;
    location / {
        proxy_pass http://gitlab;
    }
}

server { 
    server_name jfrog.dev.local;
    location / {
        proxy_pass http://jfrog;
    }
}

Notes:

• set Gitlab exteranl_url to "git.dev.local".

• I can access the git.dev.local:8000 directly without any issues.

• the jfrog mapped from port 8082 to 8082 and gitlab from 8000 to 80.

• the Jfrog is accessible using the nginx reverse proxy without any issues.

• the Nginx (reverse proxy), Gitlab and Jfrog containers all attached to custom network with their host names.

  • docker network connect --alias jfrog.dev.local general-network jfrog

  • docker network connect --alias git.dev.local general-network gitlab

[error] 42 42: *111 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.48.1, server: git.dev.local, request: "GET /api HTTP/1.1", upstream: "http://172.18.0.2:8000/", host: "git.dev.local"

Answer 1

When doing reverse proxy using nginx container, I should forward the port to the docker port not host port as the answered here. thanks for Jollege answer.