How to Secure Your Linux Server? Step-by-Step Guide

Linux Server Security
June 27, 2024 | Cybersecurity
  1. Introduction
  2. What is Linux Server?
  3. Assessing Security Risks
  4. Securing Your Linux Server: Step-by-Step Guide
  5. Best Practices for Linux Server Security
  6. Conclusion
  7. FAQs

Ensuring Linux server security is crucial for maintaining a secure IT infrastructure in the current landscape of threats. Securing the networked nodes has become more crucial due to the rising number of security threats in the world. While firewalls and network infrastructure can help reduce external risks and offer protection for Linux servers, there has been a rise in local vulnerabilities with limited proactive protection measures.

Linux servers are commonly utilized in corporate settings and may be susceptible to attacks if not adequately protected. Thus, it is necessary to know how to secure Linux server. Protecting Linux servers is crucial in order to avoid unauthorized access, data breaches, and any other security issues. Linux security best practices involve securing accounts and logins, addressing components and subsystems, prioritizing updates and patches, securing networks and firewalls, protecting remote access, and conducting vulnerability scans.

What is Linux Server?


Prior to learning how to secure Linux server, one must know what the Linux server is. A server based on the Linux open-source operating system is known as a Linux server, providing companies with an affordable solution for providing content, apps, and services to their customers. Linux servers are well-liked because of their open-source design, strong performance abilities, and customizable features, which cater to businesses of any scale.

They offer enhanced efficiency, scalability, cost reductions, stability, security, and a wide range of software applications. The secure and reliable base of Linux servers makes them well-suited for government or financial institutions. Due to their extensive use in hosting important applications and services, securing Linux servers is essential. Linux server technology will persist in offering cutting-edge solutions for a long time due to the continuously changing technology environment.

Security elements comprise encryption, verification, restriction of access, and tools for managing users to safeguard data stored on the server. Consistent upkeep activities like installing software updates, checking system logs, and conducting security audits are essential for the efficient functioning of Linux servers.

Assessing Security Risks

Linux servers face a myriad of security perils, encompassing malware, illicit access, and data breaches. Incidents involving Linux-targeted malware carry grave risks, including remote code execution and data exposure, posing profound security threats. The National Vulnerability Database recorded 1,958 Linux vulnerabilities in 2020, underscoring the criticality of robust defenses.

Cyber assailants commonly exploit system frailties to infiltrate networks, underscoring the imperative of vigilant vulnerability management and meticulous patching protocols to mitigate exposure to emerging exploits. It can take just a couple of days, or sometimes even just a few hours, for someone to discover an exploit for a vulnerability.

This issue is especially important for Linux because a majority of the software running on it is open-source, and the amount of time and expertise needed to reverse-engineer a fix may be shorter than ever.

Securing Your Linux Server: Step-by-Step Guide

Securing Linux Server

Want to know how to secure Linux server? Here’s a step-by-step guide to securing Linux servers:

A. Implementing Access Controls

Understanding the implementation of access controls is important to learn how to secure Linux server. Make sure that strong passwords that meet complexity requirements are regularly changed to protect both user accounts and root access. Improve security by setting up SSH to verify users with cryptographic keys instead of passwords, making it more difficult for unauthorized users to enter. Minimize potential entry points for attackers by turning off unnecessary services and deleting unused user accounts to reduce the attack surface.

B. Patch Management and Software Updates

Protection for Linux servers is possible by frequently updating the Linux OS and upgrading software packages to the most recent releases. Simplify the update process by using automated patch management tools to guarantee the timely application of security patches. Recognize and rank important security updates to quickly fix known weaknesses and reduce the chance of being exploited.

C. Configuring Firewall and Network Security

To answer the question ‘how to secure Linux server,’ it is crucial to control inbound and outbound network traffic by setting up firewall regulations to permit only essential connections, thus lowering the chances of unauthorized entry.

Segment the network to protect vital services from online threats by keeping them separate from the public internet. Oversee network traffic for any signs of questionable behavior and possible dangers through the implementation of IDS/IPS systems to identify and stop unauthorized entry or harmful actions.

D. Deploying Encryption and Data Protection Measures

Maintain the utmost security for data residing on the Linux server by enabling disk encryption, even in scenarios of physical server access. Uphold network communication integrity by employing TLS/SSL encryption protocols to cloak data transmissions between clients and the server, thwarting any interception or tampering attempts.

Avert data loss by consistently backing up crucial data and securely storing the backups offsite, mitigating the repercussions of security breaches or system malfunctions.

E. Monitoring and Auditing

Track system activity, resource utilization, and security incidents using monitoring tools to glean an understanding of server functionalities and potential security hazards. Consolidate logging settings for comprehensive aggregation and analysis of log information from diverse origins, facilitating swift identification and remediation of security breaches.

Uncover potential weaknesses and vulnerabilities via regular security examinations and vulnerability evaluations to uphold the server’s robustness against evolving threats.

Best Practices for Linux Server Security

Once you learn how to secure Linux server, you must understand that securing Linux servers requires a multi-layered approach.

  • Linux security best practices involve keeping the operating system and software up to date to address vulnerabilities and enhance security.
  • Minimize attack surfaces by configuring servers with strict security settings and removing unnecessary services.
  • As per Linux security best practices, enforce robust authentication mechanisms and limit user privileges to prevent unauthorized access.
  • Protect sensitive data and communications using encryption technologies in accordance with Linux security best practices.
  • Monitor server activity for signs of compromise and conduct regular audits to detect and mitigate security risks.
  • Keep abreast of emerging threats and securing Linux best practices.

Morphisec Knight for Linux offers innovative protection for Linux servers using Moving Target Defense (MTD) technology, dynamically altering the attack surface to thwart threats and providing detailed forensics on prevented attacks. This protection security solution enhances security by randomizing APIs in memory, safeguarding critical assets from supply chain attacks and other exploits at runtime.


Protecting Linux servers from advanced threats is paramount in today’s evolving threat landscape. Regular updates, hardening configurations, strong access controls, encryption, and monitoring are key steps in securing Linux. Prioritizing Linux server security and staying informed about Linux security features is essential. Morphisec Knight Linux Server Security offers advanced threat protection through machine learning and behavioral analysis, fortifying servers against unknown and zero-day attacks and enhancing overall security measures.


What measures should I take to safeguard my linux server against advanced threats?

If you are wondering how to secure Linux server, you must know that it is important to adhere to best practices. To protect Linux servers from advanced threats, one must consistently update and patch the OS and software while diligently monitoring and auditing server operations.

How can I enhance the security of SSH access to my Linux server?

Elevate the security of SSH access to your Linux server by creating an SSH key pair and deactivating root access privileges.

What approach can I employ to enhance Linux server security via file system permissions?

Utilize commands like chmod and chown to establish suitable permissions and ownership for files and directories, thus enhancing Linux server security.

Which tools offer continuous monitoring and intrusion detection capabilities for my Linux server?

Consider leveraging solutions like Morphisec Knight for continuous monitoring and detecting intrusions on your Linux server.

What's a secure method for enabling logging and auditing on my Linux server?

Ensure logging and auditing on your Linux server are secure by adopting a centralized logging system. Routinely scrutinize logs for indications of suspicious activities and maintain secure storage and backup protocols for log files.

What advanced strategies exist for strengthening the security of a Linux server?

Explore Linux security best practices for fortifying your server, including the utilization of tools such as Morphisec Knight.