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the-aks-playground

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the aks playground

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<h1 align="center">the AKS (Azure Kubernetes Service) 🤯<br/> playground </h1>

<div align="center">
  <sub>Built with ❤︎ by
  <a href="https://github.com/nicolgit">nicolgit</a>,  <a href="https://github.com/lucapisano">lucapisano</a> and  <a href="https://github.com/mela125">mela125</a>
  </a>
</div>
<br/><br/>

![hub and spoke](https://raw.githubusercontent.com/nicolgit/the-aks-playground/main/images/architecture-h-and-s.png)

_Download the [draw.io file](images/architecture.drawio) of this schema_

This repo contains a preconfigured Azure Kubernetes Service cluster embedded inside an hub-and-spoke network topology, aligned to the Azure enterprise-scale landing zone reference architecture, useful for testing and studying network configurations in a controlled, repeatable environment.

As bonus many scenarios with step-by-step solutions for studying and learning are also available.

The "playground" is composed by:
  * a hub and spoke network topologies aligned with the <a href="https://docs.microsoft.com/en-us/azure/cloud-adoption-framework/ready/enterprise-scale/architecture" target="_blank">Microsoft Enterprise scale landing zone</a> reference architecture
  * an AKS cluster deployed in one spoke
  * routing table(s) and firewall policy configured so that all the AKS outbound traffic is routed through the firewall

# Deploy to Azure

You can use the following button to deploy the demo to your Azure subscription:

| | &nbsp; | &nbsp; |
|---|---|---|
|1| the **AKS** playground<br/><sub>deploys `hub-lab-net` spokes `01`-`02`-`03` an `AKS Cluster` and all the required routing | [![Deploy to Azure](https://aka.ms/deploytoazurebutton)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fnicolgit%2Fthe-aks-playground%2Fmain%2Fmodules-arm%2Fhub-spoke-aks.json)

# Architecture

This diagram shows a detailed version with also all subnets, virtual machines, NVAs, IPs and Firewalls.

![detailed architecture](https://raw.githubusercontent.com/nicolgit/the-aks-playground/main/images/architecture-detail.png)
_Download the [draw.io file](images/architecture.drawio) of this schema._

the ARM template [hub-spoke-aks.json](modules-arm/hub-spoke-aks.json) deploys:

* 4 Azure Virtual Networks:
    * `hub-lab-net` with 4 subnets:
        * an empty `default` subnet 
        * AzureFirewallSubet: a subnet is used by Azure Firewall
        * AzureBastionSubnet: a subnet is used by Azure Bastion
        * GatewaySubnet: a subnet ready to deploy an by Azure Virtual Network Gateway
    * `spoke-01` with 2 subnets `default` and `services`
    * `spoke-02` with 2 subnets `default` and `services`
    * `spoke-03` with 2 subnets `default` and `services`
* `lab-firewall`: an Azure Firewall **premium** on the `hub-lab-net`  network
* `my-firewall-policy`: a sample policy that implements the any-to-any routing between spokes and all the internet traffic outbound
* `all-to-firewall-we` and `all-to-firewall-ne`: route tables that forward all the outbound traffic through the central Azure Firewall
* `hub-playground-ws`: a log analytics workspace where to collect all firewall logs
* `aks-01`: an Azure Kubernetes Service cluster deployed on `services` `spoke-01` subnet

`aks-01` cluster has 1 node pool and 2 sample workload deployed: `azure vote front` and `azure vote back` taken from the [Microsoft Artifact Registry](https://mcr.microsoft.com/): a super-simple front-end/back-end application that exposes a sample UI over HTTP. 
To test the workload, you need to know the IP of the front-end load balancer.
_Because we're using Azure CNI, you could also have used the pod IP. But keep in mind that pods are volatile, so in a Kubernetes context it is always advisable to use the load balancer IP. _

You can find this IP in:
* Azure Portal > `aks-01` > Services and ingresses > `azure-vote-front` > Services > `azure-vote-front` > External IP (something like **10.13.1.y**)

To test it: access to `hub-vm-01` in RDP/bastion and open in Edge `http://x.x.x.x` (where `x.x.x.x` is the IP found above)

## Playground's scenarios
Here there is a list of tested scenarios usable on this playground.

For each scenario you have:

* **prerequisites**: component to deploy required to implement the solution (only the hub, also one on-prem playground or both)
* **solution**: a step-by-step sequence to implement the solution
* **test solution**: a procedure to follow, to verify if the scenario is working as expected

| | scenario description | solution |
|---|---|---|
| 1 | Deploy a confidential computing nodes pool | [see the documentation](scenarios/confidential-01.md) |
| 2 | Expose a workload from AKS with Azure Front Door | [see the documentation](scenarios/front-door.md) |
| 3 | Expose a workload from AKS with Azure Firewall | [see the documentation](scenarios/firewall-01.md) |
| 4 | Deploy Container Insights on AKS Cluster | [see the documentation](scenarios/containerinsights.md) |

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