Unsupported Kubernetes version is detected - But I'm on the latest version!

Question

Hi.

I've got an Advisor recommendation on my AKS cluster (UK South) saying :

Unsupported Kubernetes version is detected

The portal says I am running v 11.8.4

So, as per - https://learn.microsoft.com/en-us/azure/aks/upgrade-cluster I run:

az aks get-upgrades --resource-group myResourceGroup --name myAKSCluster --output table

And get:

ERROR: Table output unavailable. Use the --query option to specify an appropriate query. Use --debug for more inf

Which the link says means no upgrade is available.

If I run :

az aks get-upgrades --resource-group $RG --name $AKS

"controlPlaneProfile": {
"kubernetesVersion": "1.18.4",
"name": null,
"osType": "Linux",
"upgrades": null
},

Which suggests no upgrade is available.

Am I missing something or is there a bug in the advisor?

Answer 1

@WillNewman-3490

As you mentioned, you are running 1.18.4 version of kubernetes. This version is not fully supported version in AKS (it is available in preview mode and not in GA mode) and hence you are seeing incompatible version in Advisor. This version would be available in Aug 20 as GA. Please check the release schedule for AKS information here.

Since this is preview mode, you will not be able to downgrade to 1.17.x (supported AKS GA versions). If you are planning to use AKS in production environment, I would recommend you to create another cluster with 1.17.x and move your workload to that cluster as that is fully supported version in AKS for now.

Hope this helps.

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