How to use the command line to enhance your Linux server security

How to use the command line to enhance your Linux server security

Abstract: In this article, I will share some common command line operations that can help you strengthen your Linux Server security. These operations include updating the system, using firewalls, configuring access control lists, and setting up logging. By using these tips, you can maximize your server's security and reduce potential security risks.

Keywords: Linux server, security, command line, firewall, access control list, logging

Introduction

In today's digital era, protecting the security of the server Crucial. As an administrator, you need to take a number of steps to prevent potential security threats and attacks. In Linux servers, the command line is one of the powerful tools for managing and protecting the server. It provides powerful and flexible features that can help you enhance the security of your server. Next, let’s explore some ways to enhance the security of your Linux server using the command line.

1. Update system software

Keeping the software installed on the server updated to the latest version is an important part of ensuring security. Through the command line, you can easily update system software. The following are some commonly used commands:

1. Use apt-get to update the package:

sudo apt-get update
sudo apt-get upgrade

2. Use yum to update the package:

sudo yum update

2. Use a firewall

Firewalls are a key component in protecting servers from network attacks. Linux provides a powerful firewall tool called iptables, which can be configured through the command line. Here are some commonly used commands:

1. Allow specific ports:

For example, allow SSH connections

sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT

2. Allow specific IP addresses :

For example, allow access from a specific IP address

sudo iptables -A INPUT -s 192.168.1.100 -j ACCEPT

3. Deny all other connections that are not allowed:

sudo iptables -A INPUT -j DROP

3. Configuring Access Control Lists (ACLs)

Access Control Lists (ACLs) are a feature used to control the access permissions of specific users or user groups to files and directories. Through the command line, you can easily configure ACLs. The following are some commonly used commands:

1. Add ACLs rules:

sudo setfacl -m u:user:rwx /path/to/file
sudo setfacl -m g:group:rx /path/to/directory

2. View ACLs rules:

getfacl /path/to/file

4. Settings Logging

Logging is an important means of tracking server activity and identifying potential security issues. Through the command line, you can configure the server's logging. The following are some commonly used commands:

1. View system log:

sudo tail -f /var/log/syslog

2. View login log:

sudo tail -f /var/log/auth.log

Conclusion

By using the command line, you can enhance the security of your Linux server. In this article, we cover some common commands and operations, including updating system software, configuring firewalls, using ACLs, and setting up logging. By using these tips, you can maximize your server's security and reduce security risks. I hope this article will help you protect your server security!

References:

1. Rose, J. (2017). How to Secure Your Linux Server with IPTables. Retrieved from https://www.tecmint.com/linux-server -hardening-security-tips/
2. Red Hat. (n.d.). Securing and Hardening Red Hat Linux Production Systems. Retrieved from https://www.redhat.com/archives/rhl-devel-list/2005 -January/msg00806.html

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