LDAP authentication with Percona Server
I have used the Percona PAM Authentication Plugin for MySQL to successfully authenticate individual users via LDAP but so far I haven't managed to the group/proxy part working.

You do need to make sure that there is a PAM profile for MySQL, which is probably the bit that is missing (first question) from the article you linked. I had also read through that along the way.

I found this guide particularly helpful for getting it working (second question):


http://www.arubin.org/blog/2012/07/16/mysql-pam-ldap-authentication-module-configuration/


I'm still in the process of finalising this all and once I'm finished I'll blog about my experience and update this post with more information. Hope this helped!