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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Injecting configurations from files

In its purest, and probably the most common form, a ConfigMap takes a single file. For example, we can create one from the cm/prometheus-conf.yml file:

kubectl create cm my-config \

We created a ConfigMap (cm) called my-config. The data of the map is the content of the cm/prometheus-conf.yml file.

Let's describe it, and see what we'll get.

kubectl describe cm my-config  

The output is as follows:

Name:         my-config 
Namespace:    default 
Labels:       <none> 
Annotations:  <none> 
  scrape_interval:     15s 
  - job_name: Prometheus 
    metrics_path: /prometheus/metrics 
      - targets: 
        - localhost:9090 
Events:  <none> 

The important part is located below Data. We can...