Wednesday, 2 May 2018

How to add user with sudo privileges in Linux



Add a user with administrative privileges that can ssh into the server and switch to on root user using sudo.


In this article, we are using the user name linuxcnf and will add in sudoers with full privileges.

 To create a new user type the following command:

[root@linuxcnf ~]# useradd linuxcnf
[root@linuxcnf ~]# 

Verify the user ID details:

[root@linuxcnf ~]#  id linuxcnf
uid=1001(linuxcnf) gid=1001(linuxcnf) groups=1001(linuxcnf)
[root@linuxcnf ~]# 

Set the password for the user linuxcnf

[root@linuxcnf ~]# passwd linuxcnf
Changing password for user linuxcnf.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root@linuxcnf ~]# 

Add user in sudoers file, use the following command:

[root@linuxcnf ~]#  visudo /etc/sudoers

Add the below line in the file:

Linuxcnf           ALL=(ALL)              ALL

To ensure login sudo privilege, SSH to the server with the linuxcnf user:

[root@linuxcnf ~]#  ssh linuxcnf@192.168.43.107
linuxcnf@192.168.43.107's password:
Last login: Wed May 2 10:23:39 2018 from 192.168.43.103
[linuxcnf@linuxcnf ~]$

Switch with root user:

[linuxcnf@linuxcnf ~]$ sudo su -
[sudo] password for linuxcnf:
[root@linuxcnf ~]# 

Verify the logged user:

[root@linuxcnf ~]#  whoami
root

It’s done!!!

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