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NixOS ACME / LetsEncrypt

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Another day, another cert renewal48 Servers

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4 Jul 2025
@ctheune:matrix.flyingcircus.ioTheuniI'll put that into code and see how that works.08:13:00
@ctheune:matrix.flyingcircus.ioTheunisomething that doesn't fit in there is that preliminary self signed certificates can be turned off currently. 08:22:52
@ctheune:matrix.flyingcircus.ioTheunithis setup would always introduce (temporary) self-signed certificates. (currently if you turn off preliminary self signed certificates and lets encrypt doesn't work for some reason, we don't start the consumer service at all because the configs will be invalid)08:23:50
@ctheune:matrix.flyingcircus.ioTheunii would consider it an acceptable shift in detail wrt to reduced overall complexity. 08:24:40
@ctheune:matrix.flyingcircus.ioTheuni* i would consider it an acceptable tradeoff with the benefit of reduced complexity.08:25:11
@ctheune:matrix.flyingcircus.ioTheuniotoh if someone runs dns-01 everywhere and doesn't ever need to show self signed certificates and wants to reduce the risk of exposing users to those ... 08:26:12
@ctheune:matrix.flyingcircus.ioTheunihmpf.08:26:15
@ctheune:matrix.flyingcircus.ioTheunihowever, if you have a more complex service that acts as a "nexus" then maybe only one of multiple vhosts uses dns-01, others might be using http-01 or tls-01 and need the self-signed certificates anyway and then you get unpredictable behaviour.08:29:06
@ctheune:matrix.flyingcircus.ioTheuniin that sense, the tradeoff seems even more beneficial: reduced complexity and more predictable behaviour.08:29:26
@ctheune:matrix.flyingcircus.ioTheuniwe originally added it as an option when creating self-signed certificates wasn't supported yet, so ... i guess it was created as an option ... because we can?08:30:28
@ctheune:matrix.flyingcircus.ioTheunii'll turn into coding mode now and see how this works out.08:30:38
@leona:leona.isleona joined the room.08:31:15
@ctheune:matrix.flyingcircus.ioTheuni👋08:31:20
@ma27:nicht-so.sexyma27 joined the room.08:31:24
@emilazy:matrix.orgemilyI say this every time our ACME module fails to scale for someone, but ACME issuance really wants to be a proper service rather than scripted out of systemd bits and you might want to consider trying something like Caddy for an issuance daemon :)09:42:56
@emilazy:matrix.orgemily(not that I don't welcome improvements especially if they simplify the code)09:43:10
@ctheune:matrix.flyingcircus.ioTheuniyeah, our stack is already interesting, so i'd rather not use caddy (and we have non-http requirements anyway) and the overall integration is quite nice - it's a lot more advanced than what others have, so ... yeah. I was considering replacing the scripted stuff but it's not obvious to be better as a replacement when trying to start from the ground up ... 🙂10:00:53
@ctheune:matrix.flyingcircus.ioTheunii started this week with the assumption of "lets make it a proper service" but then the dependency management around it for consumers is quite complex anyway and this means doing stuff in "systemd land" isn't going away either ... 10:01:33
@ctheune:matrix.flyingcircus.ioTheuniso, at the moment: this makes me understand the code base much better and maybe we can turn it into a proper service at another point in time. lego as the client is quite valuable, so traefik would be an option, but then it gets in the way with other http stuff or needs more layering)10:02:35
@emilazy:matrix.orgemilyto be clear, you can use Caddy as an "issue TLS certs to files" daemon, for HTTP-01, TLS-ALPN-01, and DNS-0110:21:59
@emilazy:matrix.orgemily without any HTTP server component (beyond serving .well-known/acme-challenge if you use HTTP-01) 10:22:10
@emilazy:matrix.orgemilyit is one of the few ACME implementations that gets most of the things in https://github.com/https-dev/docs/blob/master/acme-ops.md right (I mean, the author co-wrote that document so not too surprising, and some of them are irrelevant these days, but :) )10:23:16
@emilazy:matrix.orgemilyanyway, not the optimal solution for every setup for sure, especially if you already integrate tightly with the NixOS ACME support10:23:31
@emilazy:matrix.orgemilyjust want to throw out that it is a very competent ACME client and if you have complex scaling needs that the module isn't covering it is worth considering for that purpose10:23:54
@emilazy:matrix.orgemily(it used to use lego internally but moved to its own acmez implementation because of lego design limitations)10:25:15
@ctheune:matrix.flyingcircus.ioTheunithanks for that input! 🙂10:27:56
@ctheune:matrix.flyingcircus.ioTheuniinterestingly the doc is a bit outdated already, though ... 10:30:34
@emilazy:matrix.orgemilywell that is just reference material for ACME client developers from >half a decade ago11:09:15
@emilazy:matrix.orgemilymost of it is still good, it's just OCSP stapling went away and ARI changed the renewal timing landscape a bit and so on11:09:40
@ctheune:matrix.flyingcircus.ioTheuniyup12:12:06

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