Linux Security and Hardening Essential Training Online Class LinkedIn Learning, formerly Lynda com

Checklists may give a false sense of security to technical people and managers. It requires serious effort to improve Linux security and apply system hardening measures correctly. So that is why this checklist will include a lot of other resources to build up your knowledge. Keep yourself and your company out of the news by protecting your Linux systems from hackers, crackers, and attackers! This course will not only teach you the security concepts and guidelines that will keep your Linux servers safe, it will walk you through hardening measures step-by-step.

Welcome to our comprehensive Linux Security and Hardening training, where we delve into the world of securing Linux systems and implementing robust defense mechanisms. In this training, you will learn essential techniques and best practices to safeguard your Linux-based infrastructure from various security threats and vulnerabilities. Growing up in New York City, NY, much of my 13 years of IT work experience in the private sector came while I lived there. Throughout this training, we provide practical examples, command-line instructions, and configuration tips to help you implement the recommended security practices. We aim to empower you with the knowledge and skills to strengthen the security of your Linux systems, protect valuable data, and mitigate potential risks.

case “production”:

SELinux (Security-Enhanced Linux) is a security module that provides a mechanism for supporting access control security policies. It helps to limit the resources a process can access, enhancing overall system security. Best practices are procedures or steps in a particular field of Linux Hardening and Security Lessons expertise that are generally accepted as being effective. They are formed by professionals reaching an agreement and share consensus-based tips with others in and outside the field. Bastille Linux was a popular tool to perform hardening of systems running Linux and other flavors.

  • You can configure a free tool, like OSSEC, to block any IP address that tries connections to more than, say, three different ports within a five-minute period.
  • Jay is a co-founder, Chief Operating Officer and CTO of the information security consulting company InGuardians.
  • Nixarmor is a set of shell scripts to harden Linux systems and help with security automation.
  • This involves a range of steps to tighten the capabilities of a system, its software, and its users.
  • It is done by setting a password or passphrase, that needs to be provided during the boot of the Linux system.
  • You’ll even learn some security concepts that apply to information security as a whole while focusing on Linux-specific issues that require special consideration.

We’ll cover file system security and how permissions work in detail, including special modes, file attributes, and ACLs. You’ll also learn what rootkits are, how to detect them, and how to remove them. As part of the network configuration, a firewall is a useful defense mechanism. It should be configured to block all traffic and only allow incoming and outgoing data streams that are required for the machine to do its job. So a web server would typically allow incoming HTTPS requests to port 443/TCP. A mail server usually has this port blocked and instead allow connections to port 25/TCP.

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Included with RHEL, new features in Podman 4.9 simplify management and increase resilience of your container environment. Now that you know the counter-attack, would you skip the hardening steps? The bulk of the total population of attackers, including fully-automated worms, aren’t willing or able to use a botnet. At that point, the probability is much lower that the attacker coming after me is in the “willing and capable” group.

During the boot process, a so-called bootloader is one of the components that is started first. During this part of the installation, there is also the option to encrypt all the data. It is done by setting a password or passphrase, that needs to be provided during the boot of the Linux system. The very first step is to ensure that your current backup strategy is working correctly. This way you always have the option to go back to a previous configuration, if for some reason things fail. Hardening the operating system means changes to its configuration will happen.

Linux Fundamentals for Security Practitioners

The software for the system is typically selected during the installation phase. That means that you have the choice to select roles, a group of packages, or individual packages. It speeds up the installation, reduces disk space, and decreases the risk of vulnerable software packages later on. The installation process is a good first indicator on well a system is hardened.

Share what you’ve learned, and be a standout professional in your desired industry with a certificate showcasing your knowledge gained from the course. Secure web servers by updating server software, configuring SSL/TLS for encrypted connections, implementing strong authentication methods, and regularly scanning for vulnerabilities. It ensures that even if data is intercepted or accessed by unauthorized persons, it remains unreadable and secure. Common myths include the belief that Linux is immune to viruses, doesn’t require a firewall, or that it’s only for tech-savvy users. These are misconceptions, as Linux also requires diligent security practices.

Checklist to improve the security of your Linux system

Learn how BeyondTrust solutions protect companies from cyber threats. Take O’Reilly with you and learn anywhere, anytime on your phone and tablet. Learn the most in-demand business, tech and creative skills from industry experts. Nix-Auditor is a tool to help with scanning Linux systems and test them against CIS benchmarks.

Linux Hardening and Security Lessons

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