CODEWITHSUNDEEP
kuberneteskubernetes-custom-resourceskubernetes-operatoroperator-sdk
ubombi
ubombi

Reputation: 1174

Is it okay when two K8S controllers modify same resource at the same time?

I have a few CRDs and each of them supposed to make edit Container.Spec's across the cluster. Like ENVs, Labels, etc...

Is it okay, if the resource is managed by more that one controller?

What are the possible pitfalls of this approach?

Upvotes: 6

Views: 1732

Answers (1)

coderanger
coderanger

Reputation: 54267

Yes, the same object can be updated by multiple controllers. The Pod object is updated by almost a dozen at this point I think. The main problem you can run into is write conflicts. Generally in an operator you do a get, then some stuff happens, then you do an update (usually to the status subresource for a root object case). This can lead to race conditions. I would recommend looking at using Server Side Apply to reduce these issues, it handle per-field tracking rather than whole objects via serial numbers.

Upvotes: 5

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