Writing an Operator from scratch

1. kubebuilder

   1 51 8,346 9.8 Go

   Kubebuilder - SDK for building Kubernetes APIs using CRDs

   

2. CodeRabbit

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3. kubernetes

   2 785 114,644 10.0 Go

   Production-Grade Container Scheduling and Management

   

   The CSR cleaner is one of the more straightforward controllers you will find in k8s source.

4. tgik-controller

   3 1 57 10.0 Go

   Example controller for TGIK talk

   

5. sample-controller

   4 8 3,314 8.9 Go

   Repository for sample controller. Complements sample-apiserver

   

   The most low-level approach I have seen is using the client-go package. Both kubebuilder and controller-runtime are based on this package. You can see an official example here: https://github.com/kubernetes/sample-controller/blob/master/docs/controller-client-go.md But even that sample requires some code generation on top of it https://cloud.redhat.com/blog/kubernetes-deep-dive-code-generation-customresources

6. metacontroller

   5 16 932 8.4 Go

   Writing kubernetes controllers can be simple

   

   Codegen is not magic, but if you want to make it simple stupid, supportable and prod-usable I'd go for metacontroller. There's not much magic to it - just common admission/validation webhooks propagated to your controller implementation, alongside the simplest possible reconciliation cycle. We had adopted Knative driven metacontrollers and it's a pretty solid approach.

7. kopf

   6 2 972 10.0 Python

   Discontinued A Python framework to write Kubernetes operators in just few lines of code. (by zalando-incubator)

   

   Zalando's had been archived since 2020, and Nolar's one has some bugs (I mean a lot).They're mostly updating deps and bumping k8s support, instead of fixing actual pending issues - you have to fix anything and everything on your own ...

8. kubernetes-operator

   7 3 - -

9. InfluxDB

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   InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.

   

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