How to set up a CentOS system to prevent the execution and transmission of malicious code

How to set up CentOS system to prevent the execution and transmission of malicious code

The rapid development of the Internet and the popularization of information technology make computer security issues particularly important. Among them, the execution and transmission of malicious code is the most common security risk. This article will describe how to set up a CentOS system to prevent the execution and transmission of malicious code, and provide relevant code examples.

1. Installing and updating the system
   First, make sure the CentOS system is the latest version and install the latest security updates. Execute the following command to update the system:

   sudo yum update

2. Install firewall
   Firewall is one of the important measures to protect computer security. In CentOS systems, you can use iptables or firewalld as a firewall. The following is a sample code to install and enable firewalld:

   sudo yum install firewalld
   sudo systemctl start firewalld
   sudo systemctl enable firewalld

3. Turn off unnecessary services
   There may be some unnecessary services in the system, which will increase the security risk of the system. You can use the following command to list the currently enabled services and close unnecessary services according to actual needs:

   sudo systemctl list-unit-files --type=service | grep enabled
   sudo systemctl stop [service_name]
   sudo systemctl disable [service_name]

4. Disable unsafe network services
   Some network services may have security vulnerabilities , in order to protect system security, it is recommended to disable these services. The following is a sample code to disable the FTP service:

   sudo systemctl stop vsftpd
   sudo systemctl disable vsftpd

5. Installing and configuring SELinux
   SELinux is the default security module of the CentOS system and can limit the execution of malicious code. The following is sample code for installing and configuring SELinux:

   sudo yum install selinux-policy-targeted
   sudo setenforce 1
   sudo sed -i 's/SELINUX=disabled/SELINUX=enforcing/g' /etc/selinux/config

6. Use secure software sources
   Using officially recognized secure software sources can ensure the security of the software. The following is the official software source sample code of CentOS:

   sudo yum install epel-release

7. Install anti-virus software and malicious code scanning tools
   Install anti-virus software and malicious code scanning tools to actively detect and remove the system Malicious code. The following is a sample code for installing ClamAV antivirus software and rkhunter scanning tool:

   sudo yum install clamav rkhunter
   sudo freshclam
   sudo rkhunter --update

8. Regular backup and monitoring system
   Regular backup of the system can prevent data loss when the system is affected by malicious code. At the same time, it is recommended to use system monitoring tools to monitor the operating status of the system in real time and promptly discover and deal with possible security vulnerabilities. The following is sample code to install and configure backup tools and monitoring tools:

   sudo yum install rsync
   sudo crontab -e

9. 2 * rsync -avz --delete /path/to/source /path/ to/backup

   sudo yum install htop
   htop

In summary, by installing and updating the system, setting up firewalls, closing unnecessary services, and disabling unnecessary Measures such as secure network services, installing and configuring SELinux, using secure software sources, installing anti-virus software and malicious code scanning tools, and regularly backing up and monitoring the system can help us effectively prevent the execution and transmission of malicious code in CentOS systems. Of course, these measures cannot completely eliminate security risks, but they can greatly improve the security of the system.

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