CentOS

Log in to your server as the root user.

ssh root@server_ip_address
Use the adduser command to add a new user to your system.

Be sure to replace username with the user that you want to create.

adduser username
Use the passwd command to update the new user’s password.

passwd username
Set and confirm the new user’s password at the prompt. A strong password is highly recommended!

usermod -aG wheel username
By default, on CentOS, members of the wheel group have sudo privileges.

Test sudo access on new user account

Use the su command to switch to the new user account.

su - username
As the new user, verify that you can use sudo by prepending “sudo” to the command that you want to run with superuser privileges.

sudo command_to_run
For example, you can list the contents of the /root directory, which is normally only accessible to the root user.

sudo ls -la /root
The first time you use sudo in a session, you will be prompted for the password of the user account. Enter the password to proceed.

Output:
[sudo] password for username:
If your user is in the proper group and you entered the password correctly, the command that you issued with sudo should run with root privileges.




https://www.digitalocean.com/community/tutorials/how-to-create-a-sudo-user-on-centos-quickstart