Thanks for the enthusiasm! I don't think you have to wait for me to update the blog though as the post on realmd at https://platformadmin.com/blogs/paul/2015/07/active-directory-authentication-for-sas-on-linux-with-realmd/ is still the same method I use today. Whilst I mention CentOS 7.1 in the post I have also used it with RHEL 7.4 and CentOS 7.5.
Try it out and if you have any specific questions post them here (as a new question) and I will respond if I can help. You can post the questions on the blog post too but if you post them here then you may also get responses from other SAS admins with experience in this area.
I'd also encourage you search for and read SAS Global Forum papers on IWA and Kerberos by Stuart Rogers, Heesun Park, Zhiyong Li, Mike Roda etc - they've published lots of essential info on these topics. A good place to start is a search of Lex Jansen's excellent SAS papers archive https://www.lexjansen.com/search/searchresults.php?q=kerberos
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