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Currently, our AKS is at Azure cni networking where pods are using ip's from VNET. I am planning to enable overlay network plugin mode with azure cni..
Once it is applied, is it possible to revert the changes and remove overlay if any issue occurs from existing cluster?
DISCLAIMER:- Just to keep your Azure MVP badge please do not jump just to answer anything. Its a humble request please read the query first. One wrong answer leads to multiple follow-up questions.
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Hello Tanul
Yes, you can update from Azure CNI to Overlay if the cluster meets the following criteria:
I don't see the option to revert to normal Azure CNI in the documentation, but I will test and get back.
Could you please read the question again. I would be grateful if you can delete this answer because other people then ignore answering it again.
My question is this
IS IT POSSIBLE TO REVERT TO NORMAL AZURE CNI MODE AFTER APPLYING OVERLAY NETWORK PLUGIN MODE.
@Andrei Barbu Thanks. Please let me know if its possible. As I will be the first one planning to use this in my company. I don't know what issues could occur.
I created an AKS cluster with overlay mode. Then I ran "az aks update --name overlay --resource-group work-rg --network-plugin-mode azure" which executed successfully but the pods still have IPs from the Pod CIDR and the JSON validation of the command still shows:
"networkPlugin": "azure",
"networkPluginMode": "overlay",
Then I tried "az aks update --name overlay --resource-group work-rg --network-plugin-mode test" where test I am sure doesn't exist and the result was the same, the command run successfully but changed nothing. I think the parameter is ignored.
Taking in consideration it is not documented, I think it is not possible to switch from Overlay to Normal Azure CNI, but I will try to check internally and get back to you.
@Andrei Barbu Thanks
It's not possible to revert the change.
I've asked the question about supportability of this to the AKS team on the GitHub issue