You're reading from Docker for Developers Develop and run your application with Docker containers using DevOps tools for continuous delivery

Product type Paperback

Published in Sep 2020

Publisher Packt

ISBN-13 9781789536058

Length 468 pages

Edition 1st Edition

Tools

Docker

Concepts

Containerization

Authors (3):

Richard Bullington-McGuire

Michael Schwartz

Andrew K. Dennis

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Table of Contents (21) Chapters

Preface

1. Section 1: An Introduction to Docker – Containers and Local Development

2. Chapter 1: Introduction to Docker FREE CHAPTER

3. Chapter 2: Using VirtualBox and Docker Containers for Development

4. Chapter 3: Sharing Containers Using Docker Hub

5. Chapter 4: Composing Systems Using Containers

6. Section 2: Running Docker in Production

7. Chapter 5: Alternatives for Deploying and Running Containers in Production

8. Chapter 6: Deploying Applications with Docker Compose

9. Chapter 7: Continuous Deployment with Jenkins

10. Chapter 8: Deploying Docker Apps to Kubernetes

11. Chapter 9: Cloud-Native Continuous Deployment Using Spinnaker

12. Chapter 10: Monitoring Docker Using Prometheus, Grafana, and Jaeger

13. Chapter 11: Scaling and Load Testing Docker Applications

14. Section 3: Docker Security – Securing Your Containers

15. Chapter 12: Introduction to Container Security

16. Chapter 13: Docker Security Fundamentals and Best Practices

17. Chapter 14: Advanced Docker Security – Secrets, Secret Commands, Tagging, and Labels

18. Chapter 15: Scanning, Monitoring, and Using Third-Party Tools

19. Chapter 16: Conclusion – End of the Road, but not the Journey

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Chapter 4: Composing Systems Using Containers

In the previous chapter, we created a server-side application using microservices architecture. The application was made up of five separate containers: three official images and two custom images. The official images were for MongoDB, Redis, and Mosca (MQTT).

For the most part, communication between containers is done via MQTT message passing. The subscriber container carries out the database Create, Read, Update, and Delete (CRUD) operations via the Node.js API for MongoDB and Redis. All of the relevant network ports are exposed on the development host, enabling the subscriber program to access the database servers at localhost (127.0.0.1) and both subscriber and publisher programs to access Mosca/MQTT at localhost, too.

In this chapter, we are going to discuss composing systems—specifically, Docker Compose. We are also going to learn how to keep network access private so that services can be accessed from within...