Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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The entire renewal process is fairly cheap, resource wise. 7 day certificates are already a thing.
In terms of bandwidth you could easily renew a billion certificates a day over a gigabit connection, and in terms of performance I recon even without specialized hardware a single system could keep up with that, though that also depends on the signature algorithms employed in the future of course.
The dependence on these servers is the far bigger problem I'd say.
This shortening of lifetimes is a slow change, so I hope there will be solutions before it becomes an issue. Like keeping multiple copies of certificates alive with different providers, so the one in use can silently fall through when one provider stops working. Currently there are too few providers for my taste, that would have to improve for such a system to be viable.
Maybe one day you'll select a bundle of 5 certificate services with similar policies for creating your certificate the way you currently select a single one in certbot or acme.sh