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RHEL5 - how to restrict cannot use previous password for 'root'

I tried to use the followings at '/etc/pam.d/system-auth' to restrict the account cannot reuse previous password.

password    sufficient    pam_unix.so md5 shadow nullok try_first_pass use_authtok remember=5

It works ok at the user account, but not for the 'root' account. Is it possible to restrict on 'root' as well ?
0
francis_lai
Asked:
francis_lai
1 Solution
 
arnoldCommented:
Usually password policy does not apply to root since it does not go through the same process as user password changes.
root running passwd is not prompted for the current password.

There are fewer people who have access to root (with sudo access to passwd should be restricted.)
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