How to add a new user to CentOS?
Jun 13, 2025 am 12:21 AM
Adding new users to the CentOS system requires attention to security settings and permission management. The most basic method is to use the useradd command. Execute sudo useradd newusername and add the -m parameter to create the user and home directory; specify the user group such as wheel through the -G parameter to give sudo permissions. Then use sudo passwd to set the password. To configure sudo permissions, it is recommended to add users to the wheel group: sudo usermod -aG wheel newusername and verify sudo permissions. If you need SSH login, 1. Check the AllowUsers settings in /etc/ssh/sshd_config and add the username; 2. When configuring the public key login, put the public key into .ssh/authorized_keys and set the chmod 700 ~/.ssh and chmod 600 ~/.ssh/authorized_keys permissions. Ignoring these details can lead to access failures or security risks.
It is not difficult to add a new user to the CentOS system, but many people tend to ignore some security settings or permission management details when operating. The following are several commonly used methods and precautions, so that you can quickly add people and ensure system security.
Use the useradd command to add users
This is the most common and basic way. Just execute in the terminal:
sudo useradd newusername
Then set the password:
sudo passwd newusername
This completes the basic user creation. However, by default, this user's home directory will not be automatically created (depending on the system configuration). You can add the -m parameter to force creation:
sudo useradd -m newusername
If you want the user to belong to a specific user group, you can use the -G parameter:
sudo useradd -m -G wheel newusername
This way the user can obtain administrator permissions through sudo.
Set user permissions (Sudo permissions)
CentOS does not add new users to the administrator group by default, so you need to manually set it up to allow new users to execute sudo commands.
There are two ways:
- Add users to
wheelgroup (recommended) - Modify
/etc/sudoersfile to directly authorize
The first method is recommended because it is more convenient and less prone to errors. The operation is as follows:
sudo usermod -aG wheel newusername
After that, you can switch to this user to verify whether sudo can be used normally:
su - newusername sudo ls /root
If the prompt is insufficient or the execution cannot be executed, it means that the configuration has not been correctly configured.
Optional: Configure SSH login permissions
If you want new users to log in to the server through SSH, you need to pay attention to two things:
Ensure that the SSH configuration allows the user to log in
Open the/etc/ssh/sshd_configfile and check if there are any restrictions similar to the following:AllowUsers newusername
If so, you need to add the new username, otherwise SSH will refuse to connect.
Configure a public key or password for the user
If you log in with a key, remember to put the user's public key into the.ssh/authorized_keysfile and set permissions:chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys
Otherwise, the key may be invalidated or even ignored by the system.
summary
The above describes how to add new users, set permissions, and configure SSH login in CentOS. These steps may seem simple, but a slight oversight can lead to security risks or access issues. For example, forgetting to add
-mcauses no home directory, or failing to add to the wheel group causes insufficient permissions, which are often pitfalls for novices.Basically that's it. As long as you follow the steps, there will generally be no problems.
The above is the detailed content of How to add a new user to CentOS?. For more information, please follow other related articles on the PHP Chinese website!
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