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How to perform AKS upgrade for a private cluster from 1.18.14 to 1.19.11 which is having istio as a service mesh

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We are planning to upgrade our Private production cluster to 1.19.11 version and before the upgrade, would like to clarify few items for safer side as this is for producton enviroment

Current Setup Details.

  • Its a private cluster and AZURE CNI enabled
  • We are using Istio 1.7.3 as service mesh

Planned Upgradation process

  • As Istio version 1.7.3 is not supported for AKS 1.19.11, we need to upgrade Istio as well.
  • looking for minimal down time and safer proces.

Items to clarify

  • Since we need to do istio upgrade also, which need to be perform first, Istio or AKS upgrade?

  • What is the best safest way to upgrade AKS cluster which is using Azure CNI, and is there any helping document regards to this?

  • What are the extra considerations need to be taken for Istio upograde in AKS cluster. Couldnt find any relevant documents related to this anywhere.

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