"In part 1 of our look at Linux PAM, we learned how to remove the annoying failed-login delay, lock out users who have too many failed login attempts and how to set a restrictive fallback configuration. Today we'll look at Linux distribution differences, dig into the module types, what order to put things in, and what the different options mean. You should have part 1 handy so you can refer to the examples.
"Red Hat is (in)famous for heavily customizing its Linux releases. This gets confusing when howto authors assume that Red Hat = Linux and don't bother to point out the Red Hat-specific bits, or when you're reading the program author's documentation and it makes no sense for Red Hat. When you're studying PAM there are two items in particular that you'll see a lot of that belong to Red Hat and its derivatives: the pam_stack.so module, and the system_auth file..."
