AKS Get-credentials does not respect KUBECONFIG env var

[Volatus]

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Describe the bug
az aks get-credentials runs fine but writes only to /Users/xs/.kube/config despite export KUBECONFIG=$HOME/.config/kube/config. Yes, the specified KUBECONFIG file does exist and even has 4 contexts in it.

To Reproduce
az aks get-credentials -n <cluster name> -g <resource group>. I currently have 4 other contexts in my KUBECONFIG.

Expected behavior
The new config for the cluster should be added to the existing kubeconfig file.

Environment summary
Installed with brew on M1 MacBook. (darwin/arm64, BigSur)
az version:

{
  "azure-cli": "2.25.0",
  "azure-cli-core": "2.25.0",
  "azure-cli-telemetry": "1.0.6",
  "extensions": {}
}

kubectl version --client:

Client Version: version.Info{
Major:"1", Minor:"21", GitVersion:"v1.21.2", GitCommit:"092fbfbf53427de67cac1e9fa54aaa09a28371d7", GitTreeState:"clean", BuildDate:"2021-06-16T12:52:14Z", GoVersion:"go1.16.5", Compiler:"gc", Platform:"darwin/arm64"
}

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Azure/aks-pm.

Issue Details

---

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Describe the bug
az aks get-credentials runs fine but writes only to /Users/xs/.kube/config despite export KUBECONFIG=$HOME/.config/kube/config. Yes, the specified KUBECONFIG file does exist and even has 4 contexts in it.

To Reproduce
az aks get-credentials -n <cluster name> -g <resource group>. I currently have 4 other contexts in my KUBECONFIG.

Expected behavior
The new config for the cluster should be added to the existing kubeconfig file.

Environment summary
Installed with brew on M1 MacBook. (darwin/arm64, BigSur)
az version:

{
  "azure-cli": "2.25.0",
  "azure-cli-core": "2.25.0",
  "azure-cli-telemetry": "1.0.6",
  "extensions": {}
}

kubectl version --client:

Client Version: version.Info{
Major:"1", Minor:"21", GitVersion:"v1.21.2", GitCommit:"092fbfbf53427de67cac1e9fa54aaa09a28371d7", GitTreeState:"clean", BuildDate:"2021-06-16T12:52:14Z", GoVersion:"go1.16.5", Compiler:"gc", Platform:"darwin/arm64"
}

Author:	Volatus
Assignees:	-
Labels:	AKS, Service Attention
Milestone:	-

[yonzhan]

route to service team