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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Creating Services by exposing ports

Before we dive into services, we should create a ReplicaSet similar to the one we used in the previous chapter. It'll provide the Pods we can use to demonstrate how Services work.

Let's take a quick look at the ReplicaSet definition:

cat svc/go-demo-2-rs.yml  

The only significant difference is the db container definition. It is as follows.

- name: db
  image: mongo:3.3
  command: ["mongod"]
  args: ["--rest", "--httpinterface"]
  - containerPort: 28017
    protocol: TCP

We customized the command and the arguments so that MongoDB exposes the REST interface. We also defined the containerPort. Those additions are needed so that we can test that the database is accessible through the Service.

Let's create the ReplicaSet:

kubectl create -f svc/go-demo-2-rs.yml
kubectl get -f svc...