Please refer the following steps:
a. Login to the server as root.
b. Execute the following command:
root@host [~]# visudo
c. The screen would show you sudoers file in the vi editor. Include the
below line into this file to assign complete root privileges to an account
(in this case it is accountname)
accountname ALL=(ALL) ALL
d. If you want that the user should be able to run particular commands, you may create a
command alias in your sudoers file, for example:
User_Alias ADMINS = accountname
Cmnd_Alias HTTPD = /etc/init.d/httpd
ADMINS ALL = HTTPD
You should be able to create a group of users whom you can then assign command aliases to. You only need to ensure that the users are separated using a comma (,).
The Cmnd_Alias would show you a list of different commands that the users of a particular Alias can run. You may then choose the user alias and assign the command alias.
In the above case user would be asked to enter password each time sudo is run. Though if you don’t want the system to ask for a password each time, you may replace ADMINS ALL = HTTPD in the last line with the following:
ADMINS ALL = NOPASSWD: HTTPD