Single sign-on across a mixed fleet: joining Linux hosts to a domain with realmd and SSSD, Kerberos and GSSAPI for SSH, mapping AD users and groups to POSIX, sudo rules sourced from AD, Samba for file shares and as a domain member, and the alternative of FreeIPA with an AD trust. Making one identity work everywhere without running everything on Windows.
Realmd
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Integrating Linux with Active Directory