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The Docker Workshop

You're reading from   The Docker Workshop Learn how to use Docker containers effectively to speed up the development process

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Product type Paperback
Published in Oct 2020
Publisher Packt
ISBN-13 9781838983444
Length 792 pages
Edition 1st Edition
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Concepts
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Authors (5):
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Engy Fouda Engy Fouda
Author Profile Icon Engy Fouda
Engy Fouda
Onur Yılmaz Onur Yılmaz
Author Profile Icon Onur Yılmaz
Onur Yılmaz
Sathsara Sarathchandra Sathsara Sarathchandra
Author Profile Icon Sathsara Sarathchandra
Sathsara Sarathchandra
Aric Renzo Aric Renzo
Author Profile Icon Aric Renzo
Aric Renzo
Vincent Sesto Vincent Sesto
Author Profile Icon Vincent Sesto
Vincent Sesto
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Toc

Table of Contents (17) Chapters Close

Preface
1. Running My First Docker Container 2. Getting Started with Dockerfiles FREE CHAPTER 3. Managing Your Docker Images 4. Multi-Stage Dockerfiles 5. Composing Environments with Docker Compose 6. Introduction to Docker Networking 7. Docker Storage 8. CI/CD Pipeline 9. Docker Swarm 10. Kubernetes 11. Docker Security 12. Best Practices 13. Monitoring Docker Metrics 14. Collecting Container Logs 15. Extending Docker with Plugins Appendix

Configuration of Services

Cloud-native applications are expected to store their configuration in environment variables. Environment variables are easy to change between different platforms without source code changes. Environment variables are dynamic values that are stored in Linux-based systems and used by applications. In other words, the variables can be used to configure applications by changing their values.

For instance, assume your application uses a LOG_LEVEL environment variable to configure what is logged. If you change the LOG_LEVEL environment variable from INFO to DEBUG and restart your application, you would see more logs and be able to troubleshoot problems more easily. In addition, you can deploy the same application with different sets of environment variables to staging, testing, and production. Likewise, the method of configuring services in Docker Compose is to set environment variables for the containers.

There are three methods of defining environment...

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