Book Image

The Docker Workshop

By : Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda
5 (3)
Book Image

The Docker Workshop

5 (3)
By: Vincent Sesto, Onur Yılmaz, Sathsara Sarathchandra, Aric Renzo, Engy Fouda

Overview of this book

No doubt Docker Containers are the future of highly-scalable software systems and have cost and runtime efficient supporting infrastructure. But learning it might look complex as it comes with many technicalities. This is where The Docker Workshop will help you. Through this workshop, you’ll quickly learn how to work with containers and Docker with the help of practical activities.? The workshop starts with Docker containers, enabling you to understand how it works. You’ll run third party Docker images and also create your own images using Dockerfiles and multi-stage Dockerfiles. Next, you’ll create environments for Docker images, and expedite your deployment and testing process with Continuous Integration. Moving ahead, you’ll tap into interesting topics and learn how to implement production-ready environments using Docker Swarm. You’ll also apply best practices to secure Docker images and to ensure that production environments are running at maximum capacity. Towards the end, you’ll gather skills to successfully move Docker from development to testing, and then into production. While doing so, you’ll learn how to troubleshoot issues, clear up resource bottlenecks and optimize the performance of services. By the end of this workshop, you’ll be able to utilize Docker containers in real-world use cases.
Table of Contents (17 chapters)
Preface

Using Prometheus Exporters

In this chapter, we have configured application metrics to provide data for Prometheus to scrape and collect, so why do we need to worry about exporters? As you have seen, Docker and cAdvisor have nicely exposed data endpoints from which Prometheus can gather metrics. But these have limited functionality. As we have seen from our new web-nginx site, there is no relevant data exposed by the web page running on our image. We can use exporters to help gather metrics from the application or service, and then provide data in a way that Prometheus can understand and gather.

Although this may seem to be a major flaw in how Prometheus works, due to the increase in the use of Prometheus and the fact that it is open-source, vendors and third-party providers are now providing exporters to help you get your metrics from the application.

This means that, by installing a specific library or using a prebuilt Docker image to run your application, you can expose your...