k8s-operator VS kubebuilder

Compare k8s-operator vs kubebuilder and see what are their differences.


Write simple Kubernetes operators in a few lines of bash (or your favourite language) (by side8)


Kubebuilder - SDK for building Kubernetes APIs using CRDs (by kubernetes-sigs)
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k8s-operator kubebuilder
1 45
32 7,367
- 1.5%
0.0 9.2
about 6 years ago 5 days ago
Python Go
Apache License 2.0 Apache License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of k8s-operator. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-08-19.


Posts with mentions or reviews of kubebuilder. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-03-14.
  • SpinKube: Orchestrating light, fast and efficient WebAssembly (Wasm) workloads in Kubernetes (k8s)
    5 projects | dev.to | 14 Mar 2024
    The Spin operator uses the Kubebuilder framework and contains a Spin App Custom Resource Definition (CRD) and controller. It watches Spin App Custom Resources and realizes the desired state in the K8s cluster. Aside from the immediate benefits gained by running Wasm workloads in k8s, additional optimizations such as Horizontal Pod Scaling (HPA) and k8s Event-driven Autoscaling (KEDA) can be achieved in a pinch.
  • Building a Kubernetes Operator with the Operator Framework
    10 projects | dev.to | 7 Jan 2024
    kubebuilder: brew install kubebuilder
  • Annotations in Kubernetes Operator Design
    4 projects | dev.to | 26 Nov 2023
    The operator that I've been working on is designed to manage the full lifecycle of a QuestDB database instance, including version and hardware upgrades, config changes, backups, and (eventually) recovery from node failure. I used the Operator SDK and kubebuilder frameworks to provide scaffolding and API support.
  • Kubebuilder Tips and Tricks
    2 projects | dev.to | 22 Aug 2023
    Recently, I've been spending a lot of time writing a Kubernetes operator using the go operator-sdk, which is built on top of the Kubebuilder framework. This is a list of a few tips and tricks that I've compiled over the past few months working with these frameworks.
  • We moved our Cloud operations to a Kubernetes Operator
    3 projects | dev.to | 15 Aug 2023
    Since we built our operator using the Kubebuilder framework, most standard monitoring tasks were handled for us out-of-the-box. Our operator automatically exposes a rich set of Prometheus metrics that measure reconciliation performance, the number of k8s API calls, workqueue statistics, and memory-related metrics. We we were able to ingest these metrics into pre-built dashboards by leveraging the grafana/v1-alpha plugin, which scaffolds two Grafana dashboards to monitor Operator resource usage and performance. All we had to do was add these to our existing Grafana manifests and we were good to go!
  • Has anyone ever tried to learn how k8s works?
    4 projects | /r/golang | 11 Jul 2023
    I wrote a CSI driver and some operators. I admire K8s, because you can find solution to almost any problem in the source code - API versioning, load balancing, request throttling, optimistic concurrency, security, and much much more. I recommend https://book.kubebuilder.io/ It is similar to Operator SDK, but without Openshift-specific stuff. It gradually introduces you to many k8s concepts, and follows design patterns that k8s uses internally.
  • What Is A Kubernetes Operator?
    3 projects | dev.to | 7 Jul 2023
  • Writing a Kubernetes Operator
    11 projects | news.ycombinator.com | 9 Mar 2023
    A better way to write an operator these days is to use kubebuilder [1].

    My complaint is that I have seen orgs write operators for random stuff, often reinventing the wheel. Lot of operators in orgs are result of resume driven development. Having said that it often comes handy for complex orchestration.


  • Question: Resources to learn K8s operator programming
    4 projects | /r/kubernetes | 28 Feb 2023
  • Which subreddit for questions about developing Kubernetes controllers?
    2 projects | /r/golang | 23 Feb 2023

What are some alternatives?

When comparing k8s-operator and kubebuilder you can also consider the following projects:

helm-operator - Successor: https://github.com/fluxcd/helm-controller — The Flux Helm Operator, once upon a time a solution for declarative Helming.

client-go - Go client for Kubernetes.

operator-sdk - SDK for building Kubernetes applications. Provides high level APIs, useful abstractions, and project scaffolding.

crossplane - The Cloud Native Control Plane

kubegres - Kubegres is a Kubernetes operator allowing to deploy one or many clusters of PostgreSql instances and manage databases replication, failover and backup.

python - Official Python client library for kubernetes

spark-operator - Kubernetes operator for managing the lifecycle of Apache Spark applications on Kubernetes.

Concourse - Concourse is a container-based continuous thing-doer written in Go.

controller-tools - Tools to use with the controller-runtime libraries

pgx - PostgreSQL driver and toolkit for Go

fission - Fast and Simple Serverless Functions for Kubernetes

cortex - A horizontally scalable, highly available, multi-tenant, long term Prometheus.