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

Chapter 2

  1. b: The image ID is the only identification of uniqueness when listing or managing images. We can have one ID with many names, including the registry part, and tags.
  2. d: All the methods described are valid.
  1. b: Using a Dockerfile is a reproducible method as we describe all actions to add software, execute commands, add files, and more, in order to build a new image. We can automate and use templates to build images with Dockerfiles and this is the preferred method.
  2. a and c: Only RUN, CMD, and ENTRYPOINT instructions admit shell and exec formats.
  3. a: Using the shell format, the container main process, as defined by the ENTRYPOINT key, cannot be modified with arguments.