Miggi

Yeah Matrix is a good choice 👍

Maybe use Docker with a UI like lazydocker or Portainer.

If you feel safe with Docker, perhaps experiment with Proxmox as a base. Then you can separate your environments into different VMs.

Matrix is a well-known self-hosted messenger. I use it for years now.

😂

Both your containers need share at least one network. It looks like have created a external network. Good job. The next step is to configure your container to join the network. Do something like this:

services:
  nginx-proxy-manager: 
     ....
     networks:
       - nginx-proxy-manager_default # or just nginx
      ...

networks:
  nginx:
    name: nginx-proxy-manager_default
    external: true  

Don’t forget to also add the network in your audiobookshelf service.

Maybe this helps: https://docs.docker.com/compose/how-tos/networking/#use-an-existing-network

I think it’s still one of the best solutions.