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 the cluster

No matter how much we plan, we will never manage to have a cluster with capacity that should serve us equally well today as tomorrow. Things change, and we'll need to be able to adapt to those changes. Ideally, our cluster should increase and decrease its capacity automatically by evaluating metrics and firing alerts that would interact with kops or directly with AWS. However, that is an advanced topic that we won't be able to cover. For now, we'll limit the scope to manual cluster updates.

With kops, we cannot update the cluster directly. Instead, we edit the desired state of the cluster stored, in our case, in the S3 bucket. Once the state is changed, kops will make the necessary changes to comply with the new desire.

We'll try to update the cluster so that the number of worker nodes is increased from one to two. In other words, we want...