Book Image

The DevOps 2.3 Toolkit

By : Viktor Farcic
Book Image

The DevOps 2.3 Toolkit

By: Viktor Farcic

Overview of this book

Building on The DevOps 2.0 Toolkit, The DevOps 2.1 Toolkit: Docker Swarm, and The DevOps 2.2 Toolkit: Self-Sufficient Docker Clusters, Viktor Farcic brings his latest exploration of the DevOps Toolkit as he takes you on a journey to explore the features of Kubernetes. The DevOps 2.3 Toolkit: Kubernetes is a book in the series that helps you build a full DevOps Toolkit. This book in the series looks at Kubernetes, the tool designed to, among other roles, make it easier in the creation and deployment of highly available and fault-tolerant applications at scale, with zero downtime. Within this book, Viktor will cover a wide range of emerging topics, including what exactly Kubernetes is, how to use both first and third-party add-ons for projects, and how to get the skills to be able to call yourself a “Kubernetes ninja.” Work with Viktor and dive into the creation and exploration of Kubernetes with a series of hands-on guides.
Table of Contents (18 chapters)
16
The End
17
Other Books You May Enjoy

Kubernetes ConfigMaps compared to Docker Swarm configs

The mechanisms behind Kubernetes ConfigMaps and Docker Swarm Configs are almost the same. At least, from the functional perspective. Both allow us to store some literal texts in the scheduler's internal data store, and both enable us to add them to containers. The syntax is equally simple and straightforward in both cases. Still, there are a few differences.

Docker is good at preventing people from doing silly things (the politically correct version of the word stupid). An example would be an attempt to delete a configuration. It cannot be deleted if there are Docker services that reference the configuration. Only after all the services that reference it are removed, are we allowed to remove the configuration source. Kubernetes, on the other hand, will let us delete a ConfigMap object without even a hint about the consequences...