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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Exploring the effects of discrepancies between resource specifications and resource usage

Let's take a look at a slightly modified version of the go-demo-2 definition:

cat res/go-demo-2-insuf-mem.yml  

When compared with the previous definition, the difference is only in resources of the db container in the go-demo-2-db Deployment.

The output, limited to the relevant parts, is as follows:

apiVersion: apps/v1beta2 
kind: Deployment 
  name: go-demo-2-db 
      - name: db 
        image: mongo:3.3 
            memory: 10Mi 
            cpu: 0.5 
            memory: 5Mi 
            cpu: 0.3 

The memory limit is set to 10Mi and the request to 5Mi. Since we already know from Heapster's data that MongoDB requires around 38Mi, memory resources...