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Does this support DNS management with nsupdate? I'm currently automating DNS on pihole by changing a text file and reloading the service, which is just not very convenient not to mention slow.
I have a similar use case where I also need my records to change dynamically.
Leng doesn't support nsupdate (feel free to make an issue!), but it supports changing the config file at runtime and having leng reread it by issuing a SIGUSR1 signal. I have not documented this yet (I'll get to it today), but you can see the code here
Alternatively, you can just reload the service like you do with pihole - I don't know how quick pihole is to start, but leng should be quick enough that you won't notice the interim period when it is restarting. This is what I used to do before I implemented signal reloading.
Edit: my personal recommendation is you use templating to render the config file with your new records, then reload via SIGUSR1 or restart the service. nsupdate would make leng stateful, which is not something I desire (I consider it an advantage that the config file specifies the server's behaviour exactly)
Pihole reloading in my case is probably mostly slow because of the hardware. That signal functionality to reload is pretty neat, though I think I disagree with the config files being the only thing specifying the servers behaviour exactly being a big advantage. In an environment using infrastructure as code it would probably be better to define DNS over the generic nsupdate API (e.g. with ansible or other equivalent tools) than having to write custom code to reload some config files that have to be regenerated every time. But for smaller home setups both options are probably fine anyhow.
I think there are two approaches to infrastructure as code (and even code in general):
Both should scale (in my company we use templating a lot) but I find the latter easier to debug, because you can 'see' the expected end result. But it boils down to personal preference really.
As for your case, ideally you don't write custom code to generate your template (I agree with you in that it's tedious!), but you use the templating tool of your framework of choice. You can see this example, it's on grimd (what I forked leng from) and Nomad, but it might be useful to you.
P.S also added to the docs on the signal reloading here