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Table of Contents
Modify sudoers file
Add users to sudo group
Check whether the user has sudo permissions
Home Operation and Maintenance CentOS How to grant sudo privileges to a user?

How to grant sudo privileges to a user?

Jul 03, 2025 am 12:11 AM
user sudo permissions

To grant sudo permissions to Linux users, there are two main methods: one is to modify the /etc/sudoers file through visudo to add authorization rules, and the other is to add the user to the default sudo group. 1. Use the visudo command to add "username ALL=(ALL) ALL" to grant full permissions. If you need to be exempt from passwords, add the NOPASSWD option, but you should use it with caution; 2. Use the "usermod -aG sudo username" command to add the user to the sudo group, which is simple and safer. After the changes, the user needs to log in again to take effect. After the configuration is completed, you can verify whether the permission is effective by executing "sudo ls /root". If you prompt "username is not in the sudoers file", it means that there is an error in the configuration and you need to check the steps. The two methods have applicable scenarios, and you can choose according to actual needs, and pay attention to the permission details and effective conditions.

In Linux systems, granting sudo permissions to users is a common practice in administrative permissions. Simply put, it is to let ordinary users execute commands that require administrator permissions. The implementation method is not complicated, but there are several key points that need attention.


Modify sudoers file

The most standard and recommended way is to configure permissions by modifying the /etc/sudoers file. It is risky to edit this file directly. It is recommended to use the visudo command to automatically check for syntax errors when saving.

  • Open a file using the command visudo
  • Add a line like the following to authorize the user:
 username ALL=(ALL) ALL

This means that the user can run any command as any user on any host. If you want to not enter your password when executing sudo , you can change it to:

 username ALL=(ALL) NOPASSWD: ALL

Note: This method is suitable for users who have a certain understanding of the system, especially in production environments, to use the password-free option with caution.


Add users to sudo group

Most modern Linux distributions (such as Ubuntu) have a sudo group by default. As long as the user is added to this group, you can obtain sudo permissions.

  • The command to add a user to the sudo group is as follows:
 usermod -aG sudo username
  • After the addition is completed, the user needs to log in again to take effect.

This method is safer and simpler and suitable for daily management. If you are not sure how to configure permissions, give priority to this method.


Check whether the user has sudo permissions

After granting permissions, it is best to verify whether it takes effect.

  • You can switch to the target user and execute a command that requires permissions, for example:
 sudo ls /root
  • If the password is prompted and the execution is successful, it means that the permissions have been correctly configured.
  • If you encounter an error username is not in the sudoers file , it means that the configuration is not completed or is incorrect. You need to check the above two steps again.

Basically that's it. Whether it is modifying sudoers files or adding groups, it is a feasible method, just choose according to actual needs. What is not complicated but is easy to ignore is the permission details and effective conditions, especially after the group permissions are changed, you have to log in again to work.

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