How to set up a CentOS system to disable unnecessary user accounts and services

How to set up CentOS system to disable unnecessary user accounts and services

CentOS is a commonly used Linux operating system. As a server operating system, security is crucial. Disabling unnecessary user accounts and services is an effective security measure to prevent unauthorized access and potential security breaches. This article will introduce how to disable unnecessary user accounts and services in CentOS systems.

1. Disable unnecessary user accounts

In the CentOS system, there are some default user accounts that are unnecessary or unsafe, and we should disable them. Disable these user accounts by following these steps:

Step 1: Open a terminal window and log in as root.

Step 2: List all user accounts, use the following command:

$ cat /etc/passwd

Step 3: Check which user accounts are unnecessary or unsafe, such as games, ftp, etc.

Step 4: Disable unnecessary user accounts, use the following command:

$ usermod --expiredate 1 [username]

For example, to disable the games user account, use the following command:

$ usermod --expiredate 1 games

Step 5: Repeat the steps 4. Disable other unnecessary user accounts.

Please note that if other users use these accounts, they need to be notified in advance or create new user accounts.

2. Disable unnecessary services

In the CentOS system, some services are installed by default, and some services are detrimental to the security of the system. In order to enhance the security of the system, we should disable unnecessary services. Here are the steps to disable a service:

Step 1: Open a terminal window and log in as the root user.

Step 2: List all running services, use the following command:

$ systemctl list-unit-files --type=service

Step 3: Check which services are unnecessary or unsafe.

Step 4: Disable unnecessary services, use the following command:

$ systemctl disable [service]

For example, to disable the telnet service, use the following command:

$ systemctl disable telnet

Step 5: Repeat step 4, Disable other unnecessary services.

Please note that disabling certain services may affect the normal operation of the system. Before disabling a service, make sure you understand its functionality and possible effects.

After completing the above steps, we have successfully disabled unnecessary user accounts and services. This will help improve the security of CentOS systems and reduce unauthorized access and potential security vulnerabilities.

Code example:

Code example to disable games user account:

$ usermod --expiredate 1 games

Code example to disable telnet service:

$ systemctl disable telnet

Please modify the user according to the actual situation Account and service names to suit your CentOS system.

Summary:

This article introduces how to disable unnecessary user accounts and services in CentOS systems. By disabling unnecessary user accounts and services, we can improve the security of our systems and prevent unauthorized access and potential security vulnerabilities. Before operating, please make sure you understand the role of user accounts and services to avoid affecting the normal operation of the system. I hope this article is helpful to you, and I wish your CentOS system runs safely!

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