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

Debugging from outside Docker


Even though Docker isolates the network, memory, CPU, and storage resources inside containers, each individual container will still have to go to the Docker host's operating system to perform the actual command. We can take advantage of this trickling down of calls to the host operating system to intercept and debug our Docker containers from the outside. In this section, we will cover some selected tools and how to use them to interact with our Docker containers. We can perform the interaction from the Docker host itself or from inside a sibling container with elevated privileges to see some components of the Docker host.

Tracing system calls

A system call tracer is one of the essential tools for server operations. It is a utility that intercepts and traces calls made by the application to the operating system. Each operating system has its own variation. Even if we run various applications and processes inside our Docker containers, it will eventually enter...