Spyke

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muskrat's data eng expert's hard drive overheats while processing 60k rows

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No, not really. Programming requires understanding of the underlying hardware, at least to a certain extent. Otherwise performance issues will look like dark magic and optimizing anything would be impossible.

Where do you start debugging if something goes wrong with the software and your information level is this low/ do you look at network stats? CPU utilization, paging/swapping? Is the hard disk bandwidth the bottleneck? Without at least some passable understanding of a computer architecture people like this just throw up their hands, or throw whatever tricks they know at the wall and see what sticks.

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Do I need a second domain to run my own authoritative dns server?

The thing you want is "glue records" the upper level server would serve ns1.example.com (this is an approved domain for example use, better to use example.com than making your own example up) as the authoritative name server. Then provide the glue record which says "ns1.example.com is at IP address X".

It should ask for IP addresses as well as hostname. Otherwise they only assumed people will "host" their domain in another hosted, as opposed to self-hosting.

In that case (and in any other case) change your registrar to someone else who supports glue records.

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I want to get started with *arr apps - here are all the things I don't understand about (reverse-/)proxies and networking in order to get it set up.

Lots of people contributed really good answers, so I don't have anything valuable to add to their answers. But I wanted to point out for your detailed question, you include what you have done, what is your understanding and what are your shortcomings clearly. As opposed to a lot of posts with vague, detail-challenged narratives, that's a top notch post.

And the community delivered by giving good answers, so go community!

Also, you didn't just ghost after the initial post and interacted.with the people who graciously donated their time, so another bonus point there, as well.

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[finished, read edit in post.]What NAS to get for running plex and is there anything I should know?

in addition to "dedicated Nas + compute node" and "just use a desktop" suggestions, there's the microserver option in between. Small, but has enough power to run stuff other than storage.

Hp proliant microserver is what I use, you can try getting a previous generation from second hand market.

https://www.hpe.com/us/en/product-catalog/compute/proliant-servers/pip.proliant-microserver.1014673551.html