Book Image

Docker High Performance. - Second Edition

By : Allan Espinosa, Russ McKendrick
Book Image

Docker High Performance. - Second Edition

By: Allan Espinosa, Russ McKendrick

Overview of this book

Docker is an enterprise-grade container platform that allows you to build and deploy your apps. Its portable format lets you run your code right from your desktop workstations to popular cloud computing providers. This comprehensive guide will improve your Docker work?ows and ensure your application's production environment runs smoothly. This book starts with a refresher on setting up and running Docker and details the basic setup for creating a Docker Swarm cluster. You will then learn how to automate this cluster by using the Chef server and cookbooks. After that, you will run the Docker monitoring system with Prometheus and Grafana, and deploy the ELK stack. You will also learn best practices for optimizing Docker images. After deploying containers with the help of Jenkins, you will then move on to a tutorial on using Apache JMeter to analyze your application's performance. You will learn how to use Docker Swarm and NGINX to load-balance your application, and how common debugging tools in Linux can be used to troubleshoot Docker containers. By the end of this book, you will be able to integrate all the optimizations that you have learned and put everything into practice in your applications.
Table of Contents (16 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Scaling applications


When we receive alerts from our monitoring system, as in Chapter 3, Monitoring Docker, that the pool of Docker containers running our web application is not loaded, it is time to scale out. We accomplished this using load balancers in Chapter 7, Load Balancing. The following diagram shows the high-level architecture of the commands we ran in Chapter 7, Load Balancing:

When we decide to scale out and add an additional Docker host, we can automate the process with a Scale out orchestrator component. This can be a series of simple shell scripts that we will install inside a build server, such as Jenkins. The orchestrator will basically ask the cloud provider API to create a New Docker Host. This request will then provision the Docker host and run the initial bootstrap script to download the configuration from our Configuration Management System in Chapter 2, Configuring Docker with Chef. This will then increase the number of nodes in our Docker Swarm cluster. After this...