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Not saying I don't believe you, but do you have any examples where changing the external port causes an issue? I change the port on almost every single docker container from what the default is. To be clear, I'm referring to the left side of the colon in the port declaration:
I should also clarify I don't use LXC containers. My background had me more familiar with VMs so I went that route. I've never felt like I'm performing surgery when deploying containers, but I have seen other complaints around docker networking that I've apparently been lucky enough to avoid.
Like I said though, do what works best for you. I don't mind tinkering to get things tuned just right, which causes some friction with unRAID. I've invested enough time an energy for this where I just have to spin up a proxmox VM and pass the IP to a few Ansible playbooks I wrote to get to a healthy base state and then start deploying my docker containers. I recognize not everyone wants to do this though.
Same here. I can't think of an instance when this hasn't worked. Perhaps if you have multiple applications that depend on each other? But you can just put those in the same compose file.