Book Image

Docker Certified Associate (DCA): Exam Guide

By : Francisco Javier Ramírez Urea
Book Image

Docker Certified Associate (DCA): Exam Guide

By: Francisco Javier Ramírez Urea

Overview of this book

Developers have changed their deployment artifacts from application binaries to container images, and they now need to build container-based applications as containers are part of their new development workflow. This Docker book is designed to help you learn about the management and administrative tasks of the Containers as a Service (CaaS) platform. The book starts by getting you up and running with the key concepts of containers and microservices. You'll then cover different orchestration strategies and environments, along with exploring the Docker Enterprise platform. As you advance, the book will show you how to deploy secure, production-ready, container-based applications in Docker Enterprise environments. Later, you'll delve into each Docker Enterprise component and learn all about CaaS management. Throughout the book, you'll encounter important exam-specific topics, along with sample questions and detailed answers that will help you prepare effectively for the exam. By the end of this Docker containers book, you'll have learned how to efficiently deploy and manage container-based environments in production, and you will have the skills and knowledge you need to pass the DCA exam.
Table of Contents (22 chapters)
1
Section 1 - Key Container Concepts
8
Section 2 - Container Orchestration
12
Section 3 - Docker Enterprise
17
Section 4 - Preparing for the Docker Certified Associate Exam

Learning about different persistence strategies

As we've already learned, there are different approaches to persistence in containers. Choosing the right solution will depend on the use case or requirements of the environment and our applications.

Local persistence

We will use local directories or files whenever we are deploying applications on isolated and standalone Docker daemons. In this approach, you should take care of filesystem permissions and secure module configurations. This strategy is quite interesting for developers as they can run multi-container applications on their laptops using local source code files inside containers. Therefore, all changes made on their local files will be synced within the containers (in fact, they will not quite be synced; rather, they are the same files that are mounted inside the container filesystem as a bind mount volume). We will review some examples of this in the Chapter labs section. This solution will not provide high availability...