Kubernetes works by running reconciliation loops to make sure that currently existing resources match a desired declared state.

Operators are a way of extending the Kubernetes core with control loops for custom resources, often for the management of companies’ own applications or third party ones.

Imagine if you could code everything operations needs to know about your application, from expected behaviour and deployment to how to deal with problems, into a system that automates it for you.

Most of the time these Operators are written (like Kubernetes) in Golang, but there are frameworks that allow for writing Operators in Java.

This talk is an introduction to Kubernetes Operators and how to write a first simple Operator in Java.