CRI-AKS | Severla clusters stuck in updating or failed state

Question

while upgrading cluster from 1.24 to 1.25 getting error Failed to save Kubernetes service . Error: Missing service mesh mode: 'Unspecified'.

Answer 1

@Guddy Kumari (MINDTREE LIMITED) Sometimes, upgrading the node image can resolve issues during the upgrade process using az aks nodepool upgrade command.
This command will trigger the upgrade again and ensure that all nodes are on the desired version.

Let me know in the comments if you are still seeing issues after trying all the suggestions in the answer provided.

Answer 2

hello @
Guddy Kumari ,

It seems like you are trying to upgrade your AKS cluster from version 1.24 to 1.25 and getting an error "Failed to save Kubernetes service. Error: Missing service mesh mode: 'Unspecified'".

This error usually occurs when you have installed a service mesh like Istio or Linkerd on your cluster and the service mesh mode is not specified during the upgrade process.

To resolve this issue, you need to specify the service mesh mode during the upgrade process. You can do this by adding the --service-mesh flag to the az aks upgrade command. For example:

az aks upgrade --resource-group myResourceGroup --name myAKSCluster --kubernetes-version 1.25.0 --service-mesh none

Hope this help you.