azure-container-apps VS keda

Azure Container Apps might be able to do this when sticky sessions enter public preview. Logic Apps is also a more flexible option - not sure what its timeouts/performance are like though

Scaling and deployments can now be done without any downtime when using health checks: https://github.com/microsoft/azure-container-apps/issues/497

But looks like it really is not supported right now - https://github.com/microsoft/azure-container-apps/issues/227

Issue 1: Azure Container Apps doesn't fully yet allow us to use the Container Apps system assigned managed identity to pull images from Azure Container Registry. This means that we have to enable the ACRs Admin Account in order to provision images from the Azure Container Registry. You can follow this GitHub issue regarding this bug.

There is similar question asked on GitHub and it has been marked as a "Feature request" - https://github.com/microsoft/azure-container-apps/issues/129

GitHub: https://github.com/microsoft/azure-container-apps

Before we kick this off, it's REALLY IMPORTANT to note that Container Apps is currently in preview! That means what I publish in my present might/will change in your future! One example of this is that the namespace that Container Apps currently reside in will be changing in March 2022, as referenced in this GitHub issue (Note to self, update this article!)

Container Apps seem to become a valid hosting option for our scenario and our requirements once BYO/bring-your-own virtual network feature is available.

It seems you want something like KEDA (https://keda.sh)

Most just utilize out of the box macro resources available in HPA.

For more advanced use cases there is keda - https://keda.sh/

Thankfully KEDA operator was already part of the cluster, and all Robin had to do was create a ScaledObject manifest targeting the Dispatch ScaleUp event, based on the rabbitmq_global_messages_received_total metric from Prometheus.

Keda

KEDA introduces event-driven scaling to Kubernetes workloads. It integrates with Kubernetes Horizontal Pod Autoscalers and can scale pods based on external metrics from services like databases and message queues (Kafka, RabbitMQ, MongoDB).

# update version 2.8.2 if required kubectl apply -f https://github.com/kedacore/keda/releases/download/v2.8.2/keda-2.8.2.yaml

This is traditionally a AWS Lambda usecase - or an OpenFaas kind of usecase. But very recently i discovered https://keda.sh/ and it seems it is specifically meant for this in a kubernetes environment.

If you deploy the application to Amazon EKS, you can also consider using KEDA to auto-scale your consumer application based on the number of messages in the MSK topic.