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Re:Ask HN: What are some fun projects to try out on a spare ... by aetherith on Wednesday July 03, 2019 @10:41AM (#20344667)
I've had a ton of fun with setting up FreeIPA [1] to do LDAP/Kerberos for single sign-on. It's a primarily RH project but I think they have a working server implementation for Ubuntu and derivatives.

[1]https://www.freeipa.org/page/Main_Page

Re:Ask HN: What are some fun projects to try out on a spare ... by dundercoder on Wednesday July 03, 2019 @11:38AM (#20345237)
I set this up 4 or 5 years ago, has it gotten easier since then? Specifically TOTP was rough.
Re:Ask HN: What are some fun projects to try out on a spare ... by elcritch on Wednesday July 03, 2019 @12:38PM (#20345962)
Try out the free version of the Univention server. It’s pretty easy with ldap and active directory running out of the box, but you have to KVM it.

1: https://www.univention.com/products/ucs/