Book Image

Mastering Linux Administration

By : Alexandru Calcatinge, Julian Balog
Book Image

Mastering Linux Administration

By: Alexandru Calcatinge, Julian Balog

Overview of this book

Linux plays a significant role in modern data center management and provides great versatility in deploying and managing your workloads on-premises and in the cloud. This book covers the important topics you need to know about for your everyday Linux administration tasks. The book starts by helping you understand the Linux command line and how to work with files, packages, and filesystems. You'll then begin administering network services and hardening security, and learn about cloud computing, containers, and orchestration. Once you've learned how to work with the command line, you'll explore the essential Linux commands for managing users, processes, and daemons and discover how to secure your Linux environment using application security frameworks and firewall managers. As you advance through the chapters, you'll work with containers, hypervisors, virtual machines, Ansible, and Kubernetes. You'll also learn how to deploy Linux to the cloud using AWS and Azure. By the end of this Linux book, you'll be well-versed with Linux and have mastered everyday administrative tasks using workflows spanning from on-premises to the cloud. If you also find yourself adopting DevOps practices in the process, we'll consider our mission accomplished.
Table of Contents (20 chapters)
Section 1: Linux Basic Administration
Section 2: Advanced Linux Server Administration
Section 3: Cloud Administration

Introducing SELinux

Security-Enhanced Linux (SELinux) is a security framework in the Linux kernel for managing the access control policies of system resources. It supports a combination of the MAC, RBAC, and MLS models that were described in the previous section. SELinux is a set of kernel-space security modules and user-space command-line utilities, and it provides a mechanism for system administrators to have control over who can access what on the system. SELinux is designed to also protect a system against possible misconfigurations and potentially compromised processes.

SELinux was introduced by the National Security Agency (NSA) as a collection of Linux Security Modules (LSMs) with kernel updates. SELinux was eventually released to the open source community in 2000 and into Linux starting with the 2.6 kernel series in 2003.

So, how does SELinux work? We'll look at this next.

Working with SELinux

SELinux uses security policies to define various access control...