First Steps with the Kubernetes Operator - Basic Principles

First Steps with the Kubernetes Operator - Basic Principles

This blog post demonstrates how you can use the Operator Lifecycle Manager to deploy a Kubernetes Operator to your cluster. Then, you will use the Operator to spin up an Elastic Cloud on Kubernetes (ECK) cluster. An operator is a software extension that uses custom resources (extension of the Kubernetes. First Steps with the Kubernetes Operator - Basic Principles

This blog post demonstrates how you can use the Operator Lifecycle Manager to deploy a Kubernetes Operator to your cluster. Then, you will use the Operator to spin up an Elastic Cloud on Kubernetes (ECK) cluster.

An operator is a software extension that uses custom resources (extension of the Kubernetes API) to manage complex applications on behalf of users.

The artifacts that come with an operator are:

  • A set of CRDs that extend the behavior of the cluster without making any change in the code
  • A controller that supervises the CRDs, and performs various activities such as spinning up a pod, take a backup, and so on.

The complexity encapsulated within an Operator can vary, as shown in the below diagram:

Operator Maturity Model. Retrieved from  https://docs.openshift.com/container-platform/4.1/applications/operators/olm-what-operators-are.html

Prerequisites

  1. A Kubernetes cluster (v1.7 or newer) with a control plane and two workers. If you don’t have a running Kubernetes cluster, refer to the “_Create a Kubernetes Cluster with Kind_” section below.

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