Difficulty: Intermediate
Estimated Time: 25 minutes

Kubernetes Universal Declarative Operator (KUDO) provides a declarative approach to building production-grade Kubernetes Operators covering the entire application life cycle.

The Cloud Native Computing Foundation (CNCF) has made the KUDO management toolkit, created by D2iQ, a sandbox-level project. –D2iQ July 2020

Operator Pattern

If you find yourself needing to manage specialized services and solution sets on Kubernetes, writing an Operator often provides controllers to manage these complexities. An Operator contains imperative management logic that reacts to declarative requests and Kubernetes events. There are a variety of projects that offer you frameworks for writing Operators. KUDO is a prominent solution for writing Operators, and this scenario teaches you how to use it.

About KUDO

KUDO is an open source Apache 2.0 project governed by the good people at D2IQ, among others. KUDO is a much easier way to write an Operator because it embraces a declarative form over imperative Go-based coding.

In this scenario, you will hand craft an Operator, create an Operator repository, and run the Operator to coordinate with your Kubernetes cluster.

In this scenario you will learn how to:

  • Install the KUDO plugin into kubectl
  • Generate an Operator
  • Configure Operator logic
  • Package and Server an Operator

Although this was a very simple Operator, you should now be familiar with the tooling and procedures needed to start developing real Operators to solve some of your more intricate software life cycle management challenges.

Using KUDO, you can deploy your applications, have the tools needed to operate them, and understand how they're behaving—all without a Ph.D. in Kubernetes.

KUDO lets you configure an Operator’s entire life cycle using a declarative spec, including things like backup/restore. You don’t have to write Go unless you want to.

Lessons Learned

With these steps you have learned:

  • ✔ How to install the KUDO plugin into kubectl
  • ✔ How to generate an Operator
  • ✔ How to configure Operator logic
  • ✔ How to package and Server an Operator

Special Thank You

To Ken Sipe, who inspired this scenario with his labs.

References


For a deeper understanding of these topics and more, join
Jonathan Johnson
at various conferences, symposiums, workshops, and meetups.

Software Architectures ★ Speaker ★ Workshop Hosting ★ Kubernetes & Java Specialist

Develop an Operator with KUDO

Step 1 of 6

Your Kubernetes Cluster

For this scenario, Katacoda has started a fresh Kubernetes cluster. Verify it's ready for your use:

kubectl version --short && \ kubectl get componentstatus && \ kubectl get nodes && \ kubectl cluster-info

The Helm package manager used for installing applications on Kubernetes is also available:

helm version --short

Kubernetes Dashboard

You can administer your cluster with the kubectl CLI tool or use the visual Kubernetes Dashboard. Use this script to access the protected Dashboard:

token.sh