No I have a domain already, and that's what I did during the first try. I have a blog (docker container with ghost) on XYZ.com. As soon as I installed cosmos, that blog went away and got replaced with cosmos as the host started pointing to the docker container of cosmos.

This is why I would like to install cosmos on my subdomain.

Question is can I install cosmos on - cosmos.xyz.com ? Or is it a requirement to have it on XYZ.com entered during setup ?

Thanks. For VPS then can I ignore the domain field during setup, and do a reverse proxy later to the cosmos container (via cosmos reverse proxy) to access it via the web ?

Installed this on my VPS a couple of days back. Look and feel fantastic and functionality like a swiss army knife. I temporarily had to turn off my container and turn back npm on. I definitely want to spend time this week to make this up and running.

1. Is there any guidance on if a subdomain is preferred over the domain ? For the first time, I used my main domain. And it somehow broke my existing let's encrypt certificate. I purged the folders and did a clean reinstall, this time on a subdomain. Works but somehow the certificate broke again. (Too many certificates or something like this)
2. Could this be because I clicked "new certificate" while I had temporarily turned off my NPM containers to try Cosmos ?