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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Updating Deployments

Let's see what happens when we set a new image to the db Pod.

kubectl set image \
    -f deploy/go-demo-2-db.yml \
    db=mongo:3.4 \

It'll take a while until the new image is pulled, so you might as well fetch yourself a coffee. Once you're back, we can describe the Deployment by checking the events it created.

kubectl describe \
    -f deploy/go-demo-2-db.yml

The last few lines of the output are as follows:

  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  19m   deployment-controller  Scaled 
up replica set go-demo-2-db-75fbcbb5cd to 1
Normal ScalingReplicaSet 5m deployment-controller Scaled
up replica set go-demo-2-db-f8d4b86ff to 1
Normal ScalingReplicaSet 0s deployment-controller Scaled...