@homelab took that script and modified it for building the template described there as well. And verified it's working. Later on I'm gonna set up some new docker containers, and then if that goes well I'll start migrating some of my existing services to them.
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@homelab neither of these were a fantastic fit to automate, because I won't be doing them regularly, and using the console and GUI was definitely faster.
Getting a better understanding of the CLI tools for VM creation was good though, and since this won't be something I do all the time, having something that I know worked the last time I used it will make it easier to repeat.