what is the difference between client-go and controller-runtime?

[wang dong]

controller-runtime is used for controller.

But client-go can also be used to write controller.

I'm not so familiar with controller-runtime. It seems this project wraps the client-go.

But client-go is more directly for communicating with cluster.

So I am confused. Please enlighten me. thanks.

[Camila Macedo]

Hi @Wang, 

They are different projects with different responsibilities and purposes. See that controller-runtime[1] is regarded to the controllers used in the operators[2]. 

And then, the client[3] is over then actions to CRUD the resources. The controller-runtime indeed provide a client which allow us to use it in the controllers to do the CRUDs. 

PS.: If Operator does not make sense for you then, you may would you like to check the Operator-SDK[4] and/or Kubebuilder[5] project as well to have a further understanding. 

[1] - https://github.com/kubernetes-sigs/controller-runtime

[2] - https://kubernetes.io/docs/concepts/extend-kubernetes/operator/

[3] - https://github.com/kubernetes/client-go

[4] - https://github.com/operator-framework/operator-sdk

[5] - https://github.com/kubernetes-sigs/kubebuilder

I hope that it helps you. 

CAMILA MACEDO

SR. SOFTWARE ENGINEER 

RED HAT Operator framework

Red Hat UK

IM: cmacedo

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[song...@gmail.com]

My understanding is the "controller" is a kind of k8s client to watch the changes from k8s, so controller-runtime wraps the client-go a lot.