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
About the Reviewer
Customer Feedback

Chapter 6. Clustering and Horizontal Scaling with LXC

Running applications inside LXC containers provides for a convenient way of allocating and limiting resources, as we saw in earlier chapters. LXC is also great for creating clusters of applications, for example, a web-server farm that can be scaled horizontally or vertically.

Horizontal scaling is a way of adding more computing power to a cluster or a group of resources performing a common task. This is usually accomplished by adding more servers, virtual machines, or in the case of LXC, more containers to run the applications. In contrast, vertical scaling is done by adding more hardware or virtual resources, such as CPU and memory, to physical servers, VMs, or containers.

In this chapter, we are going to put all the knowledge you've gained so far toward do the following:

  • Creating a simple Apache cluster, running LXC on a minimal root filesystem with libvirt

  • Implementing a multinode web cluster with Apache and HAProxy using Open vSwitch...