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Azure Kubernetes Fleet Manager supports two types of member clusters:
The following table outlines which Azure Kubernetes Fleet Manager capabilities are supported for each member cluster type.
| Capability | AKS cluster | Arc-enabled Kubernetes cluster |
|---|---|---|
| Kubernetes and node image updates | ✅ GA | ❌ Unsupported |
| Cross-cluster networking | ✅ Preview | ❌ Unsupported |
| Workload placement | ✅ GA | ✅ GA |
| DNS load balancing | ✅ GA | ❌ Unsupported |
| Managed Namespaces | ✅ GA | ❌ Unsupported |
| Managed Namespace RBAC | ✅ GA | ❌ Unsupported |
| Non-public Azure regions | ✅ GA | ❌ Unsupported |
Arc-enabled Kubernetes clusters important considerations
Depending on your environment and configuration, certain limitations might apply when connecting an Arc-enabled Kubernetes cluster to an Azure Kubernetes Fleet Manager hub. Review the following considerations.
Note
When you delete an Azure Arc-enabled Kubernetes cluster without first removing it from Fleet Manager, the Fleet Manager member cluster resource remains active, even though the target cluster no longer exists. We expect to address this limitation in a future release.
Cluster resource requirements
When you add an Arc-enabled Kubernetes cluster to Fleet Manager, the member cluster must meet the following conditions:
- At least 210 MB memory and 2% of one CPU core available.
- Reserve 3 pods for the Azure Kubernetes Fleet Manager Arc extension agents.
- Create the fleet-system namespace for Fleet-related components and don't directly modify it.
Private Fleet
For Private Fleets, configure your Arc-enabled Kubernetes cluster to use Azure Arc Gateway.
Networking
TLS-terminating proxies aren't supported. If you use a passthrough proxy, configure your Arc-enabled Kubernetes cluster to use Azure Arc Gateway.
Non-public region limitation
Fleet Manager Arc-enabled Kubernetes cluster support is available only in Azure public cloud regions due to the dependency on Azure Arc Gateway.
If you attempt to create an Arc-enabled member cluster in a non-public cloud region, you receive an error of type FeatureNotAvailableInCloud with the message The feature 'Arc Member Cluster' is not available in cloud environment.
Track the status of Azure Arc Gateway regional availability via its official documentation.
