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Go Kubernetes Demo

The purpose of this is to show how simple webhooks/controllers/operators might be and ease of their creation.

Installation

This project can fully run locally and includes automation to deploy a local Kubernetes cluster (using Kind).

Requirements

  • Container runtime (e.g. Docker)
  • Kind
  • kubectl
  • Go
  • Make
  • yq

Create Cluster

# First, we need to create a Kubernetes cluster:
❯ make cluster

# Make sure that the Kubernetes node is up:
❯ kubectl get nodes

# Make sure all pods are up:
❯ kubectl get pods -n kube-system

Usage

❯ cd webhook  # OR operator/controller
❯ make build && make deploy

Webhook

Simple webserver that analyse incoming json objects and does next:

  • mutating: returns json patches (mutations)
  • validating: returns "YES/NO" and reason

Controller

A program that uses the same control loop technique as in electronics. Usually watches for some Kubernetes objects that could be additionally filtered and does its logic.

Operator

Mostly the same as Controller but has its own CRD[s] (Custom Resource Definitions) with a defined field's structure. Watches for their changes and applies the desired configuration.