Watching K8s core APIs

[Jan Werner]

Hi all,

is there a way to watch arbitrary Kubernetes API resources, i.e. resources that are not CRs or resources managed by the operator?

What I'm trying to achieve is triggering the reconciliation loop if a Node object is changed.

Thanks,
Jan

[Varsha Prasad Narsing]

Hi Jan,

We can watch any external resource while building controllers. To do so, controller-runtime provides we can use the `Watches` method (https://github.com/kubernetes-sigs/controller-runtime/blob/v0.13.0/pkg/builder/controller.go#L127). Here is some relevant documentation around that (https://book.kubebuilder.io/reference/watching-resources.html?highlight=watch#watching-resources). Hope it helps.

Thank you

Varsha

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Varsha Prasad

Software Engineer
Operator SDK Team
Red Hat Inc. San Francisco

[Jan Werner]

Hi Varsha,

thanks a lot for your feedback. ​This is basically what I'm looking for.​ ​However​ I would like to use this with an Ansible operator​ - sorry for not being more specific initially. I couldn't find anything ​on this topic in the documentation (https://sdk.operatorframework.io/docs/building-operators/ansible/).​ ​I guess this is probably something that is only possible with Go-based Operators?

T​hanks,
Jan

[Fabian von Feilitzsch]

On Mon, Sep 19, 2022 at 12:02 PM 'Jan Werner' via Operator Framework <operator-...@googlegroups.com> wrote:

Hi Varsha,

thanks a lot for your feedback. This is basically what I'm looking for. However I would like to use this with an Ansible operator - sorry for not being more specific initially. I couldn't find anything on this topic in the documentation (https://sdk.operatorframework.io/docs/building-operators/ansible/). I guess this is probably something that is only possible with Go-based Operators?

This should work fine with Ansible-based Operators as well, just add the resource to your `watches.yaml` as normal and make sure `manageStatus` is set to false in the watches entry, since another controller is actually managing the resource.

 

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[Jan Werner]

You're right, working perfectly. Thanks a lot!