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Understanding the linux kernel11/10/2023 ![]() ![]() There’s also a concerted effort within Linux to separate the user space from the kernel space, meaning that the processes running throughout the system aren’t all necessarily available to users (depending on role privileges) and, likewise, the user processes aren’t available to the system as a whole. Linux has built-in tools and modules-like SELinux-to help further lock down, monitor, report, and remedy security issues. Each piece that makes up the Linux operating system has the ability to be audited, monitored, and secured. Securing one aspect doesn’t mean everything is secure-you have to address all parts.īecause Linux is modular its security can be more easily managed. The broader view of security also takes into account risk management, compliance, and governance. When it comes to IT security, the operating system plays a part in a larger story that goes from physical hardware to the people with access to that hardware as well as the applications deployed on the hardware. Open your possibilities: An open source security discussion from Red Hat The best security is layered. Linux continues to be the operating system of the future, with more and more systems depending on its stability and extensibility. Meanwhile, Amazon Web Services and Google Cloud Platform offer up multiple distributions of Linux in their publicly available images. When it comes to cloud, even on Microsoft’s Azure, more than 60% of the images on the Azure Marketplace and nearly ⅓ of virtual machines are Linux-based. As of 2017, 50% of the SAP market are Windows customers. By 2027, all SAP customers will be moving to SAP HANA-an in-memory, relational database management system-which only runs on Linux. NET Core/Mono) so that any platform can run it, opening up the capability for Linux-using developers to make applications with that framework. Microsoft has embraced Linux and open source in other ways, producing a SQL Server for Linux and open sourcing their. It has multiple use cases, distributions, target systems and devices, and capabilities-all depending on your needs and workloads. Linux has grown over the years to be the de facto standard for running highly available, reliable, and critical workloads in datacenters and cloud deployments. It’s at the core of some of the biggest industries and businesses in the world-from knowledge-sharing websites like Wikipedia to the New York Stock Exchange to mobile devices running Android (which is a specific-use distribution of the Linux kernel with complimentary software). This book will help you make the most of your Linux system.Linux can serve as the basis for nearly any type of IT initiative, including containers, cloud-native applications, and security. You'll learn what conditions bring out Linux's best performance, and you'll see how it meets the challenge of providing good system response during process scheduling, file access, and memory management in a wide variety of environments. The book focuses on the following topics: * Memory management, including file buffering, process swapping, and Direct memory Access (DMA) * The Virtual Filesystem layer and the Second and Third Extended Filesystems * Process creation and scheduling * Signals, interrupts, and the essential interfaces to device drivers * Timing * Synchronization within the kernel * Interprocess Communication (IPC) * Program execution Understanding the Linux Kernel will acquaint you with all the inner workings of Linux, but it's more than just an academic exercise. This edition of the book covers Version 2.6, which has seen significant changes to nearly every kernel subsystem, particularly in the areas of memory management and block devices. But the book covers more than just the functioning of the code it explains the theoretical underpinnings of why Linux does things the way it does. Relevant segments of code are dissected line by line. Important Intel-specific features are discussed. Probing beyond superficial features, the authors offer valuable insights to people who want to know how things really work inside their machine. The third edition of Understanding the Linux Kernel takes you on a guided tour of the most significant data structures, algorithms, and programming tricks used in the kernel. It manages limited memory so well that hundreds of processes can share the system efficiently, and expertly organizes data transfers so that the CPU isn't kept waiting any longer than necessary for the relatively slow disks. ![]() The kernel handles all interactions between the CPU and the external world, and determines which programs will share processor time, in what order. In order to thoroughly understand what makes Linux tick and why it works so well on a wide variety of systems, you need to delve deep into the heart of the kernel. ![]()
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