Initial Setting CentOS 7 - Add an User

Add an User "cent" as an example below.

[root@dlp ~]# 

useradd cent 

[root@dlp ~]# 

passwd cent 

Changing password for user cent.
New UNIX password:

# set password

Retype new UNIX password:

# confirm

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

exit 

Try to switch to a user that was added above.

dlp login: 

cent

# input user name

password: 

# password

[cent@dlp ~]$ 

su - 

# switch to root

Password:

# root password

[root@dlp ~]# 

Make a user be only a user who can switch to root as an administration user. (it's 'cent' in this example)

[root@dlp ~]# 

usermod -G wheel cent 

[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            substack        system-auth
auth            include         postlogin
account         sufficient      pam_succeed_if.so uid = 0 use_uid quiet
account         include         system-auth
password        include         system-auth
session         include         system-auth
session         include         postlogin
session         optional        pam_xauth.so

To forward to emails for root user to another user, set like follows. (it's 'cent' in this example)

[root@dlp ~]# 


vi /etc/aliases



# Person who should get root's mail



# last line: uncomment and change to a user

root: 

cent

[root@dlp ~]# 

newaliases