Scientific Linux 6
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Create an admin user
2011/03/13
[1] Create an admin user.
[root@dlp ~]#
useradd fermi

[root@dlp ~]#
passwd fermi

Changing password for user fermi.
New UNIX password:
# set password

Retype new UNIX password:
# Confirm

passwd: all authentication tokens updated successfully.
[root@dlp ~]#
# logout

[2] Try to switch to a user that was added above.
dlp login:
fermi
# input user name

password:
# password

[fermi@dlp ~]$
su -
# switch to root

Password:
# root password

[root@dlp ~]#
# just switched to root

[3] Make a user (it's 'fermi' in this example) be only a user who can switch to root as an administration user.
[root@dlp ~]#
vi /etc/group


# line 11: add user name

wheel:x:10:root
,fermi


[root@dlp ~]#
vi /etc/pam.d/su


#%PAM-1.0
auth
sufficient
pam_rootok.so

# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth
sufficient
pam_wheel.so trust use_uid

# Uncomment the following line to require a user to be in the "wheel" group.
# uncomment the following line

auth
required
pam_wheel.so use_uid

auth
include
system-auth

account
sufficient
pam_succeed_if.so uid = 0 use_uid quiet

account
include
system-auth

password
include
system-auth

session
include
system-auth

session
optional
pam_xauth.so

Forwarding email for root to administration user
[4] Configure that forwarding emails for root to administration user you set above.
[root@dlp ~]#
vi /etc/aliases


# Person who should get root's mail
# last line: uncomment and change to a user

root:
fermi


[root@dlp ~]#
# Configuration change

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