Detect http request per second to pod without any observability app?

Question

Team,

I don't have any app like prometheus installed in my AKS and I need to setup horizontal pod autoscaler on the basis of http request per second using autoscaling/v2.

Is it possible to do this in AKS. I can build customer metrics server but it also requires the data which it will further pass on to HPA. The whole problem is the generation of metrics data. Is it possible to get the "http request per second to pod" using metrics server or anything else.

I can't deploy prometheus or datadog apps etc.

Thank you

Answer 1

Hello @Tanul ,
Yes , It is possible in AKS to implement HPA based on "requests per second".

Have a look at the below articles:

https://github.com/Azure/azure-k8s-metrics-adapter
YouTube Video for Custom Scale Metrics: https://www.youtube.com/watch?v=XcKcxh3oHxA
Request per second example walk through custom Metrics from Application Insights:
https://github.com/Azure/azure-k8s-metrics-adapter/tree/master/samples/request-per-second

Hope those articles helps you out in the implementation, good luck.

Answer 2

Hi @Tanul

Thanks for using Q & A forum.

The Metrics Server is used to provide resource utilization to Kubernetes, and is automatically deployed in AKS clusters versions 1.10 and higher.

To see the version of your AKS cluster, use the az aks show command, as shown in the following example:

az aks show --resource-group myResourceGroup --name myAKSCluster --query kubernetesVersion --output table  

To use the autoscaler, all containers in your pods and your pods must have CPU requests and limits defined.

The metrics-server uses the Kubernetes API to track nodes and pods in your cluster. The metrics-server queries each node over HTTP to fetch metrics.
https://kubernetes.io/docs/tasks/debug/debug-cluster/resource-metrics-pipeline/#metrics-server

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