Understanding memory information on Linux systems

Understanding Linux memory information Every operating system needs memory to store program code segments and data. This is also true for Linux systems. The problem: there is a lot of information available regarding memory usage and its behavior. Let’s discover how Linux manages its memory and how we can gather memory information. Great for troubleshooting, but also to learn more about the inner workings of our system. Random access memory When we talk about memory in this article, we usually mean […]

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Livepatch: Linux kernel updates without rebooting

Maximize uptime with livepatch If you run a Linux server, software patching is a task that will have to be performed on a weekly (or daily) basis. Although most programs can be auto-restarted with a tool like needrestart, there is one exception: the kernel. Wouldn’t it be a nice if we could patch the kernel, without the mandatory reboot? Here is livepatch, the feature of the Linux kernel that makes it possible. Kernel Live Patching Core Although there are more […]

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How to see the version of Oracle Linux

Determine Oracle Linux version Oracle Linux is based on Red Hat Enterprise Linux. At first, it may be confusing to determine what specific operating system is running. This is because both have the /etc/redhat-release file. If that file exists, use the cat command to display the contents. Next step is to determine if there is a /etc/oracle-release file as well. If so, then you can be sure that Oracle Linux is running. cat /etc/oracle-release Sample output might be: Oracle Linux Server release […]

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Show vulnerable packages on Arch Linux with arch-audit

Vulnerable Software Packages on Arch Linux Vulnerabilities happen and are usually fairly quickly fixed. This is also true for Arch Linux. This rolling distribution can be considered to be always up-to-date, as it uses the latest versions of software packages from the upstream. When there is an update, it doesn’t take long that it becomes available and can be installed with package manager pacman. One problem that remained was the inability to quickly test if you have any vulnerable packages. After all […]

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Linux Security Guide (extended version)

Linux Security Guide (extended version) With so many articles about Linux security on the internet, you may feel overwhelmed by how to properly secure your Linux systems. With this guide, we walk through different steps, tools, and resources. The main goal is to have you make an educated choice on what security defenses to implement on Linux. For this reason, this article won’t show any specific configuration values, as it would implicate a possible best value. Instead, related articles and […]

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Difference between CentOS, Fedora, and RHEL

Difference between CentOS, Fedora, and RHEL The biggest open source company is nowadays Red Hat. It is known for its contributions to many open source projects, including the Linux kernel itself. Less known is that Red Hat is involved in different Linux distributions, directly or indirectly. Fedora Fedora has received many updates and individual releases over the years. It is a playground for new functionality. Often new technology is found here. It can be compared with other distributions like Arch […]

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The Most Influential Linux Security Blogs

The Most Influential Linux Security Blogs Finding quality blogs about Linux security can be challenging. We made an effort to seek the best and most influential blogs on the internet. What makes it influential? It should have quality articles, regularly updated and tailored to Linux or UNIX security. The countless “How to” websites are skipped. Months of searching and reading resulted in a list of blogs, sorted by category. If you are interested in the developments on Linux security, add […]

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How Linux Security Fails to be Simple

Linux Security Should be Simple, Right? Why that is not a reality, and we might never achieve it. Linux gained great popularity over the last 10 years, powering our servers and smartphones. With all the efforts put in creating more secure software, it seems installing security updates will remain a weekly task. Will this ever change? Security is Hard Properly securing a system means different things for different people. So let’s take the assumption that every system has a particular […]

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