This works great (and I use it) internally but when you want things like your docker domains to work when you're on the go, it's annoying.

I have setup a VM running DNS on my laptop before ...

It is not too difficult to allow your PiHole to serve you globally (but does requiring opening some ports in your firewall == additional security risk).

There is a simple checkbox within the DNS's web interface to `Allow WAN Requests`. You'd then only run into issues of accessing your local IP addresses if those hosts aren't configured correctly within your network rulesets.

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I am a user, not an expert; by trade, I am a blue collar electrician. I know very little about internet topology except how to use simple open-source hardware. Perhaps what you said makes sense (e.g. that you cannot use outside your network, some service(s)).