CentOS 8.x Configure password aging

It might be desired to set password aging so that users are forced to change password after a fixed interval.

Check current password aging configuration

To check current password aging configuration for a user use:

chage -l <username>

Use man chage to see how to change various listed values for a user

Note that this only affects new users created after the values are changed. This does not affects existing users password aging

To configure password aging for new users edit '/etc/login.defs' and set values for:

PASS_MAX_DAYS   99999
PASS_MIN_DAYS   0
PASS_MIN_LEN    8
PASS_WARN_AGE   7

where

PASS_MAX_DAYS: Maximum no. of days for which password is valid and need not be changed
PASS_MIN_DAYS: Minimum no. of days that must pass since last password change. A value of 0 means user can change password immediately after changing once.
PASS_MIN_LEN: Minimum length of password. Better see CentOS 8.x Configure password complexity on password complexity
PASS_WARN_AGE: These many days before PASS_MAX_DAYS (Password expiry) since last change, the warning would be displayed to user.

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