refactor: moved articles in the new correct folder

knowledge base/azure/aks.md

@@ -0,0 +1,38 @@
+# Azure Kubernetes Service
+
+Managed Kubernetes solution offered by Azure.
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL:DR](#tldr)
+1. [Troubleshooting](#troubleshooting)
+   1. [_Subnet XXX does not have enough capacity for YY IP addresses_ while updating the credentials for an existing Service Principal](#subnet-xxx-does-not-have-enough-capacity-for-yy-ip-addresses-while-updating-the-credentials-for-an-existing-service-principal)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL:DR
+
+## Troubleshooting
+
+### _Subnet XXX does not have enough capacity for YY IP addresses_ while updating the credentials for an existing Service Principal
+
+> When you reset your cluster's credentials on an AKS cluster that uses Azure Virtual Machine Scale Sets, a Node image upgrade is performed to update your Nodes with the new credential information.
+
+The image upgrade rollout should proceed one Node at a time unless configured differently.<br/>
+Make sure you have enough space in your cluster's Subnet for at least one new Node (with all its possible containers).
+
+## Further readings
+
+- [Update or rotate the credentials for an AKS cluster]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+<!-- project's references -->
+[Update or rotate the credentials for an AKS cluster]: https://learn.microsoft.com/en-us/azure/aks/update-credentials
+
+<!-- internal references -->
+[further readings]: #further-readings
+
+<!-- external references -->

knowledge base/kubernetes/README.md

@@ -302,7 +302,9 @@ See [Using `sysctls` in a Kubernetes Cluster].
 
 ## Managed Kubernetes Services
 
-Most cloud providers offer their managed versions of Kubernetes. Check their websites.
+Most cloud providers offer their managed versions of Kubernetes. Check their websites:
+
+- [Azure Kubernetes Service]
 
 ### Best practices
 
@@ -509,6 +511,7 @@ All the references in the [further readings] section, plus the following:
 [using sysctls in a kubernetes cluster]: https://kubernetes.io/docs/tasks/administer-cluster/sysctl-cluster/
 
 <!-- internal references -->
+[azure kubernetes service]: ../azure/aks.md
 [create an admission webhook]: ../../examples/kubernetes/create%20an%20admission%20webhook/README.md
 [helm]: helm.md
 [helmfile]: helmfile.md