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Hello Team
We got email from Microsoft Azure as
Upgrade your AKS Kubernetes version before 27 February 2020
You're receiving this email because you are using the Azure Kubernetes Service (AKS).
We detected that one or more AKS clusters for the Subscription ID(s) listed in the Account Information section are using Kubernetes v1.13 or lower. AKS will be retiring v1.13 on 27 February 2020. To stay within supported versions and SLO please upgrade your clusters to 1.14 or higher.
How to Upgrade AKS Kubernetes version?
[Note: As we migrate from MSDN, this question has been posted by an Azure Cloud Engineer as a frequently asked question.] Source: MSDN Thread Link
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Easier way to upgrade your cluster is via portal or Azure CLI.
During the upgrade, platform will pick a node, cordon and drain the node and replace that nod with the new version. This will happen in a sequence for all the nodes.
If there is a failure during that process, upgrade stops. Its better to pick a non business hour for upgrades.
While upgrading you can move to the next minor version. You can't jump versions. So if you want to move from 1.11 to 1.13, you need to do two upgrades. One from 1.11 to 1.12 and, the next one from 1.12 to 1.13
This document explains the process of upgrading a cluster clearly. Please go through that and let me know if you face any issues.
Source : MSDN Thread Link
Also check for the available version in your target region.
az aks get-versions --location eastus --output table
https://learn.microsoft.com/en-us/azure/aks/supported-kubernetes-versions#faq
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And how to try a second upgrade if it fails???
It just stays in failed ... how to resume the operation or see some output .... what is the actual problem????
Might be due to network latency, you just retry the steps as we are not sure you are performing via GUI or CLI
Also check for the available version in your target region.
az aks get-versions --location eastus --output table
https://learn.microsoft.com/en-us/azure/aks/supported-kubernetes-versions#faq