0845680984
  1. Add Repositories
  2. Add an User
[1] Add an User “soncq” as an example below.
[root@localhost ~]# useradd soncq
[root@localhost ~]# passwd soncq
Changing password for user soncq.
New UNIX password:     # set password
Retype new UNIX password:     # confirm
passwd: all authentication tokens updated successfully.
[root@localhost ~]# exit     # logout
[2] Try to switch to a user that was added above.
localhost login: soncq     # input user name
password:     # password
[soncq@localhost ~]$ su -     # switch to root
Password:     # root password
[root@localhost ~]#     # just switched to root
[3] Make a user be only a user who can switch to root as an administration user. (it’s ‘soncq’ in this example)
[root@localhost ~]# usermod -aG wheel soncq
[root@localhost ~]# 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
[4] To forward to emails for root user to another user, set like follows. (it’s ‘soncq’ in this example)
[root@localhost ~]# vi /etc/aliases
# Person who should get root's mail
# last line: uncomment and change to a user
root: soncq
[root@localhost ~]# newaliases     # reload

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