LXC and Docker issue with Nginx proxy pass

[DeviC3]

On one of my lxc containers I installed nginx (as usual systemd service) and on docker I have web image which have port 3000 opened.
On vhost side proxy pass is configured like this

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

    server_name example.com;

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

    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_set_header   Host $host;
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Host $server_name;
        proxy_set_header   X-Forwarded-Proto $scheme;
    }

}

But unfortunately nginx shows 502 with error log lines

connect() failed (111: Connection refused) while connecting to upstream

On any VM there are no problem with this I'm using Proxmox 7.2-7 version
Is there any issues with this type of communication ?

 

[shanreich]

Are nginx and the webservice running in two separate containers? Because then using 127.0.0.1 as IP would point to the local docker container, not the host. You need to specify the IP of the docker container instead (usually smth like 172.16.x.x or an alias (name of the container)).

 

[DeviC3]

I've created VM, it takes too much time to configure it on lxc if it is possible

 

[shanreich]

So you have docker running with both the webservice and nginx in the VM? Because then it would still pose a problem using 127.0.0.1 as the IP. You can check the name of the container via docker ps -a and then try using the name of the container (in the rightmost column) instead of the IP address. For the future it might be smart to assign a fixed name to the web service container then, so it works after restarting the container.