Book Image

Containerization with LXC

By : Konstantin Ivanov
Book Image

Containerization with LXC

By: Konstantin Ivanov

Overview of this book

In recent years, containers have gained wide adoption by businesses running a variety of application loads. This became possible largely due to the advent of kernel namespaces and better resource management with control groups (cgroups). Linux containers (LXC) are a direct implementation of those kernel features that provide operating system level virtualization without the overhead of a hypervisor layer. This book starts by introducing the foundational concepts behind the implementation of LXC, then moves into the practical aspects of installing and configuring LXC containers. Moving on, you will explore container networking, security, and backups. You will also learn how to deploy LXC with technologies like Open Stack and Vagrant. By the end of the book, you will have a solid grasp of how LXC is implemented and how to run production applications in a highly available and scalable way.
Table of Contents (17 chapters)
Containerization with LXC
About the Author
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Chapter 1. Introduction to Linux Containers

Nowadays, deploying applications inside some sort of a Linux container is a widely adopted practice, primarily due to the evolution of the tooling and the ease of use it presents. Even though Linux containers, or operating-system-level virtualization, in one form or another, have been around for more than a decade, it took some time for the technology to mature and enter mainstream operation. One of the reasons for this is the fact that hypervisor-based technologies such as KVM and Xen were able to solve most of the limitations of the Linux kernel during that period and the overhead it presented was not considered an issue. However, with the advent of kernel namespaces and control groups (cgroups) the notion of a light-weight virtualization became possible through the use of containers.

In this chapter, I'll cover the following topics:

  • Evolution of the OS kernel and its early limitations

  • Differences between containers and platform virtualization

  • Concepts and terminology related to namespaces and cgroups

  • An example use of process resource isolation and management with network namespaces and cgroups