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.

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Table of Contents (22 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
1
Section 1 - Key Container Concepts
Section 1 - Key Container Concepts
Free Chapter
2
Modern Infrastructures and Applications with Docker
Modern Infrastructures and Applications with Docker
Technical requirements
Understanding the evolution of applications
Infrastructures
Processes
Microservices and processes
What are containers?
Learning about the main concepts of containers
Docker components
Building, shipping, and running workflows
Windows containers
Customizing Docker
Docker security
Chapter labs
Summary
Questions
Further reading
3
Building Docker Images
Building Docker Images
Technical requirements
Building Docker images
Understanding copy-on-write filesystems
Building images with a Dockerfile reference
Image tagging and meta-information
Docker registries and repositories
Securing images
Managing images and other related objects
Multistage building and image caches
Templating images
Image releases and updates
Chapter labs
Summary
Questions
Further reading
4
Running Docker Containers
Running Docker Containers
Technical requirements
Reviewing the Docker command line in depth
Learning about Docker objects
Running containers
Interacting with containers
Limiting host resources
Converting containers into images
Formatting and filtering information
Managing devices
Chapter labs
Summary
Questions
Further reading
5
Container Persistency and Networking
Container Persistency and Networking
Technical requirements
Understanding stateless and stateful containers
Learning about different persistence strategies
Networking in containers
Learning about container interactions
Publishing applications
Chapter labs
Summary
Questions
Further reading
6
Deploying Multi-Container Applications
Deploying Multi-Container Applications
Technical requirements
Installing and using Docker Compose
Understanding the docker-compose.yaml file
Using the Docker Compose command-line interface
Customizing images with docker-compose
Automating your desktop and CI/CD with Docker Compose
Chapter labs
Summary
Questions
Further reading
7
Introduction to Docker Content Trust
Introduction to Docker Content Trust
Technical requirements
The Update Framework
Signing images
Reviewing signatures
Creating and running applications in trusted environments
Chapter labs
Summary
Questions
Further reading
8
Section 2 - Container Orchestration
Section 2 - Container Orchestration
9
Introduction to Orchestration
Introduction to Orchestration
Introducing orchestration concepts
Learning about container orchestration
Scheduling applications cluster-wide
Managing data and persistency
Scaling and updating application components
Summary
Questions
Further reading
10
Orchestration Using Docker Swarm
Orchestration Using Docker Swarm
Technical requirements
Deploying Docker Swarm
Creating a Docker Swarm cluster
Scheduling workloads in the cluster – tasks and services
Deploying applications using Stacks and other Docker Swarm resources
Networking in Docker Swarm
Chapter labs
Summary
Questions
Further reading
11
Orchestration Using Kubernetes
Orchestration Using Kubernetes
Technical requirements
Deploying Kubernetes using Docker Engine
Deploying a Kubernetes cluster with high availability
Pods, services, and other Kubernetes resources
Deploying orchestrated resources
Kubernetes networking
Publishing applications
Kubernetes security components and features
Comparing Docker Swarm and Kubernetes side by side
Chapter labs
Summary
Questions
Further reading
12
Section 3 - Docker Enterprise
Section 3 - Docker Enterprise
13
Introduction to the Docker Enterprise Platform
Introduction to the Docker Enterprise Platform
Reviewing the Docker editions
Understanding CaaS
The Docker Enterprise platform
Planning your Docker Enterprise deployment
Summary
Questions
Further reading
14
Universal Control Plane
Universal Control Plane
Technical requirements
Understanding UCP components and features
Deploying UCP with high availability
Reviewing the Docker UCP environment
Role-based access control and isolation
UCP's Kubernetes integration
UCP administration and security
Backup strategies
Upgrades, monitoring, and troubleshooting
Summary
Questions
Further reading
15
Publishing Applications in Docker Enterprise
Publishing Applications in Docker Enterprise
Technical requirements
Understanding publishing concepts and components
Understanding an application's logic
Publishing applications in Kubernetes using ingress controllers
Using Interlock to publish applications deployed in Docker Swarm
Reviewing Interlock usage
Summary
Questions
Further reading
16
Implementing an Enterprise-Grade Registry with DTR
Implementing an Enterprise-Grade Registry with DTR
Technical requirements
Understanding DTR components and features
Deploying DTR with high availability
Learning about RBAC
Image scanning and security features
Integrating and automating image workflow
Backup strategies
Updates, health checks, and troubleshooting
Summary
Questions
Further reading
17
Section 4 - Preparing for the Docker Certified Associate Exam
Section 4 - Preparing for the Docker Certified Associate Exam
18
Summarizing Important Concepts
Summarizing Important Concepts
Reviewing orchestration concepts
A brief summary of Docker image concepts
A summary of the Docker architecture, installation, and configuration topics
A summary of the networking topics
Understanding security concepts and related Docker features
Quickly summarizing Docker storage and volumes
Summary
19
Mock Exam Questions and Final Notes
Mock Exam Questions and Final Notes
Docker Certified Associate exam details
Mock exam questions
Summary
20
Assessments
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Exam answers
21
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Comparing Docker Swarm and Kubernetes side by side

In this section, we will compare the Docker Swarm and Kubernetes features side by side to get a good idea of how they solve common problems. We have discussed these concepts in both this chapter and in Chapter 8, Orchestration Using Docker Swarm. They have common approaches to many problems:

Parameters Docker Swarm Kubernetes
High-availability solution Provides high availability for core components. Provides high availability for core components.
Resilience All services run with resilience based on the state definition. All resources based on replication controllers will provide resilience (ReplicaSet, DaemonSet, Deployment, and StatefulSet) based on the state definition.
Infrastructure as code The Docker Compose file format will allow us to deploy stacks. We will use YAML to format resource files. These will allow us to deploy workloads using a declarative format.
Dynamic distribution Application components and their replicas...
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