Setting password expiration settings on CentOS

Question

How does one set the password expiration parameters on CentOS or Red Hat Linux using PAM? Specifically, I need to set the following:

1. Maximum number of days that a password may be used.
2. Minimum number of days allowed between password changes.

Answer 1

There is a file that will do this: /etc/login.defs. Two values you want to look to change here:

• PASS_MAX_DAYS
• PASS_MIN_DAYS

Answer 2

the parameters you are searching for are:
PAM_MAX_DAYS
PAM_MIN_DAYS

you'll find a more detailed explanation and some other hints here.