I have 1 master node & 2 worker nodes in the on-premise servers i.e. bare metal running kubernetes.
Considering that after few months, we might need more nodes. We will be using Azure going further for provisioning more nodes.
Can AKS work in combination with the on-prem machines, such that active master is in on-prem & the second master is in Azure, and the additional worker nodes can be scaled up/down in Azure?
Is it possible to achieve the below scenario, where on-prem & azure both can work together for the same K8s cluster? If yes, then any 3rd party tool is available for setting up as so and make life easy?
1 master & 2 worker nodes
+
1 master & 5 worker nodes (scale up/down)
I found options for you to consider:
Setting up Kubernetes to work in an hybrid cloud environment is absolutely possible today and many companies choose this path as a progressive migration to Azure. You can benefit from the flexibility and scalability of Azure, maintain existing systems running on your local network, and get them to talk to eachother seamlessly. This however still requires a non-negligible investment in the infrastructure setup, and maintenance of it.
You can use Azure Arc to register Kubernetes clusters hosted outside of Microsoft Azure, and use Azure tools to manage these clusters alongside clusters hosted in Azure Kubernetes Service (AKS).
The later one would require you to use Azure Arc.
I haven't used them myself but they seem to fit your use case.