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thanky you, this looks like exactly what I need.
I do run several webservices (nextcloud, matrix) behind the same reverse proxy (nginx prxy manager). In my setup I have one docker with nginx running, which is the only one to be exposed to the web. It proxy-ing for the other services relies upon them being in the same network. It all works well, however I ran into problems when restarting my server after a shutdown. I suspect that some of the services tried to get the same ip adress as my nginx service, which results in that service not running properly and my whole reverse proxy setup falls apart at that point.
I'm not certain, that this is really what happens but I want to try and assign the fixed ip's and see if that solves the problem.
Honestly, I'd be surprised if static IPs fix it. Docker's default network type (bridge network) is very good at assigning IPs to containers without clashing, even with container restarts and replacements: it's been battle tested for years in production use. As others have said, standard DNS hostnames of containers should be sufficient. But I'll certainly be interested to hear your results.
Edit: I fixed my problem by re-making my nginx reverse proxy and a do-over of my proxy hosts. I have yet to restart my server, though ...
I'm a beginner with all of this stuff, so I'm sure I'm not assessing correctly what's wrong with my setup. It's more of a methodical "trial and error" approach, that I have, where I change one thing at a time and see what happens ... quite time consuming but it helps me to figure things out along the way :)
However, if you have an idea, what could be wrong with my server, I'd appreciate any ideas: I run Nginx Reverse Proxy with nginx in a container within a custom network "my_network" and have assigned that container a fixed IP. I run other containers (portainer, mariadb, nextcloud, synapse) that all connect to the same custom network. The nginx container "see's" the outside web with ports 80 and 443 openend on the firewall for that container's fixed ip and routes traffic (and needed other ports) to my other containers. This is all working well and also works after restarting the server.
Now I tried to install a lemmy instance and got it up and running by bringing the lemmy containers in my custom network as well and proxy'img my nginx to the lemmy proxy. However, when I made a restart of the server, something broke and I cannot get the web-ui of NPM to load. I think somehow host names and/or IP adresses got mixed up somewhere. The containers start just fine, but I can't access it with web-ui anymore. Also reverse proxy-ing doesn't work, but if I open the needed ports on my firewall manually I can access the other services containers.
I hope this is even understandable, not sure if I'm using the correct terms ..