Joining Debian 8 Jessie to Active Directory, and sharing files with Samba + realmd

There are three different ways to join a Samba domain in Linux.

1. Using pbis-open and samba interop 
1. Pbis open latest (8.3) works on Jessie (download here) to make your Linux box into a Kerberos client to your AD domain
2. Sadly Pbis Samba interop does not work with latest Samba 4.1 in Debian 8
2. Using the classical way of Samba + Winbind pam (although this does not include Kerberos)
1. https://wiki.samba.org/index.php/Setup_a_Samba_AD_Member_Server
3. Using realmd as below (this is the most modern way I suppose)
1. https://fedorahosted.org/sssd/wiki/Configuring_sssd_with_ad_server
2. http://www.hexblot.com/blog/centos-7-active-directory-and-samba