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)
The End
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Converting ConfigMap output into environment variables

All the examples we've seen so far are differing only in the source. The destination is always the same. No matter whether ConfigMap is created from a file, from a directory, from literal values, or from an environment file, it perpetually resulted in one or more files being injected into a container.

This time we'll try something different. We'll see how we can convert a ConfigMap into environment variables.

Let's take a look at a sample definition:

cat cm/alpine-env.yml  

The output is as follows.

apiVersion: v1 
kind: Pod 
  name: alpine-env 
  - name: alpine 
    image: alpine 
    command: ["sleep"] 
    args: ["100000"] 
    - name: something 
          name: my-config 
          key: something...