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Azure Kubernetes Service
https://azure.github.io/AKS/
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Get cluster-autoscaler elements with kubectl #1910

Closed alk-rniveau closed 4 years ago

alk-rniveau commented 4 years ago

What happened:

Based on this example https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/azure/examples/cluster-autoscaler-aks.yaml, it seems when we enable cluster-autoscaler, some elements are created within the cluster.

Currently, I can only get the config map and watch events. I would like to know if it's possible to get other elements with kubectl (I can't see nothing)

What you expected to happen:

Have a vision about pod or other elements which compose the cluster-autoscaler.

Environment:

ghost commented 4 years ago

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marwanad commented 4 years ago

@alk-rniveau the deployment you linked is for running your own (unmanaged) cluster-autoscaler in an AKS cluster. In the managed autoscaler case which you enable via --enable-cluster-autoscaler in CLI or enableAutoScaling in ARM templates - the only applicable resource you can view in your cluster is the configmap that gets created.

alk-rniveau commented 4 years ago

Thanks for your answer but here is my issue:

I would like to pause the CA during some periods as we can see here https://github.com/hellofresh/eks-rolling-update/ (yes it's for eks).

Why can't we watch deployment with the managed solution ?

marwanad commented 4 years ago

@alk-rniveau it seems that this assumes the existence of cluster autoscaler in your cluster. With the managed solution, the actual autoscaling component .

Some alternatives you can consider:

I'm interested in your use-case, what's your use case? Are you trying to prevent scale down? If so, we can expose another parameter that allows you to disable scale down completely.

alk-rniveau commented 4 years ago

My use case is the following:

Sometime I redeploy many deployments in the same time. This manipulation can cause a useless scaleup node. This is useless because once the burn phase is over (after the deployment), this node is scaled down.

It's not a load from bigger usage of the platform, but just due to the max surge behavior.

marwanad commented 4 years ago

@alk-rniveau would setting new-pod-scale-up delay overcome that case for you then? This basically says "wait until pods are x age old" before considering a scale-up.

alk-rniveau commented 4 years ago

this parameter is not is the doc https://docs.microsoft.com/fr-fr/azure/aks/cluster-autoscaler. I think this parameter come from this issue https://github.com/Azure/AKS/issues/1716. Sad :( Do you know if terraform provider will be updated ? https://github.com/terraform-providers/terraform-provider-azurerm

marwanad commented 4 years ago

Following up on the doc update now.

For the Terraform provider, it's better to open up an issue there. The Go SDK for the September API should be available and ready to consume by Terraform.